WO2001048860A1

WO2001048860A1 - Built-in antenna of wireless communication terminal

Info

Publication number: WO2001048860A1
Application number: PCT/JP2000/004044
Authority: WO
Inventors: Hideo Ito; Kiyoshi Egawa
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 1999-12-24
Filing date: 2000-06-21
Publication date: 2001-07-05
Also published as: AU5428200A; CN1345473A; EP1154513A1; EP1154513A4

Abstract

A dipole antenna (12) is composed of a meandering antenna element, which extends perpendicularly to the upper (horizontal) surface of a wireless communication terminal. The signal received at the dipole antenna (12) is sent to a transmitting and receiving circuit through a balanced-to-unbalanced transformer (13). The balanced-to-unbalanced transformer (13) minimizes the current flowing to a ground plane (11), thus preventing the ground plane (11) from acting as an antenna.

Description

Built-in for wireless communication terminals

Technical field

The present invention relates to an antenna used for a wireless device, a portable terminal, and the like. Light

Background art

In recent years, miniaturization of wireless communication terminals has been promoted in order to improve portability. Along with this, miniaturization of the built-in antenna used for wireless communication terminals is also required.

Have been. As a conventional built-in antenna to meet this demand, a plate-shaped inverted-F antenna is used. Hereinafter, a built-in antenna used in a conventional wireless communication terminal will be described.

FIG. 1 is a schematic diagram showing a configuration of a built-in antenna used in a conventional wireless communication terminal. Although each element shown in the figure is mounted in the housing of the wireless communication terminal, the overall view of the wireless communication terminal is omitted for simplicity of description. As shown in FIG. 1, a conventional wireless communication terminal generally includes a ground plane 1 and a plate-shaped inverted-F antenna 2. Note that X, Y and Z indicate respective target axes.

Further, the above-mentioned conventional built-in antenna is also used as a diversity antenna for coping with fluctuations in received electric field strength due to multipath of radio waves. FIG. 2 is a schematic diagram illustrating a configuration of a diversity antenna used in a conventional wireless communication terminal. As shown in FIG. 2, the conventional wireless communication terminal has a configuration in which a monopole antenna 3 is provided as an external antenna in addition to the above-described plate-shaped inverted-F antenna 2. Diversity reception is performed by two antennas, the planar inverted F-shaped antenna 2 as an internal antenna and the monopole antenna 3 as an external antenna, and stable communication can be realized. However, the planar inverted-F antenna used in the conventional wireless communication device operates as an exciter that excites the ground plane 1 rather than the planar inverted-F antenna 2 itself operating as an antenna. Therefore, an antenna current flows through the ground plane 1, and the ground plane becomes dominant as an antenna. As a result, there is a problem that the gain of the planar inverted-F antenna 2 used in the conventional wireless communication terminal is reduced due to the influence of the human body of the user of the wireless communication terminal.

Here, a specific example of the reception characteristics of the planar inverted-F antenna 2 used in the conventional wireless communication terminal will be described with reference to FIGS. 3A and 3B. 3A and 3B are graphs showing measured values of the reception characteristics of a planar inverted-F antenna used in a conventional wireless communication device. The size of the ground plane 1 is 120 x 36 mm and the frequency is 218 MHz.

First, FIG. 3A is a diagram showing the reception characteristics of a planar inverted-F antenna 2 used in a conventional wireless communication terminal on a horizontal plane (XY plane) in free space. As shown in FIG. 3A, since the ground plane 1 operates as an antenna, the planar inverted-F antenna 2 is almost omnidirectional.

On the other hand, FIG. 3B is a diagram illustrating reception characteristics of a horizontal plane (X-Y plane) of a planar inverted-F antenna 2 used in a conventional wireless communication terminal during a call. Here, it is assumed that the wireless communication terminal is used in a state as shown in FIG. That is, as shown in FIG. 5, the wireless communication terminal 4 provided with the plate-shaped inverted-F antenna 2 and the monopole antenna 3 is used for a call by the user 5.

As is clear from FIG. 3B, the gain of the planar inverted-F antenna 2 is reduced during a call. Comparing Fig. 3A and Fig. 3B, the decrease in the gain of the plate-shaped inverted-F antenna 2 is due to the effect of the human body, for example, the effect of the radio wave being cut off by the user's head or hand. It is clear that

Next, a specific example of the radiation characteristics of the planar inverted-F antenna 2 used in the above-described conventional wireless communication terminal will be described with reference to FIGS. 4A and 4B. Figures 4A and 4B show the radiation characteristics of a plate-shaped inverted F antenna used in a conventional wireless communication device. It is a figure which shows the measured value of sex.

FIG. 4A is a diagram showing the radiation characteristics of a horizontal plane (X-Y plane) in free space of a plate-shaped inverted-F antenna 2 used for a conventional wireless communication terminal. As shown in FIG. 4A, since the ground plane 1 operates as an antenna, the planar inverted-F antenna 2 is almost omnidirectional.

On the other hand, FIG. 4B is a diagram illustrating radiation characteristics in a horizontal plane (XY plane) of the planar inverted-F antenna 2 used in the conventional wireless communication terminal during a call. Here, it is assumed that the wireless communication terminal is used in a state as shown in FIG. As is clear from FIG. 4B, the gain of the planar inverted-F antenna 2 decreases during a call. The lowering of the gain of the planar inverted F-shaped antenna 2 is due to the effect of the human body, for example, the effect of blocking the radio wave by the user's head or hand, comparing FIGS. 4A and 4B. It is clear that

As described above, the plate-shaped inverted-F antenna 2 used in the conventional wireless communication terminal has a problem that the gain is reduced due to the influence of the human body. Further, with respect to the diversity antenna used in the above-described conventional wireless communication terminal, when the plate-shaped inverted-F antenna 2 operates, there is a problem that the gain is reduced due to the influence of the human body. Disclosure of the invention

An object of the present invention is to provide a small-sized and high-gain built-in antenna for a wireless communication terminal which is less affected by a human body.

The purpose of this is to provide a dipole antenna in a wireless communication terminal and supply power to the dipole antenna via a balun conversion circuit having an impedance conversion function, so that the antenna has a directivity opposite to the human body during a call. This is achieved by having

Further, an object of the present invention is to provide a parasitic element in parallel to an axial direction of an antenna element constituting a dipole antenna, and to provide an antenna constituting the dipole antenna. By appropriately adjusting the axial length of the antenna element, the axial length of the parasitic element, and the distance between the antenna element forming the dipole antenna and the parasitic element, during a call, This is achieved by making the antenna have directivity opposite to the human body.

Also, an object of the present invention is to provide a parasitic element formed in a rod shape, wherein the parasitic element has an axial direction substantially parallel to an axial direction of a rod-shaped antenna element forming a dipole antenna. Also, a reference plane formed including the self-element and the antenna element constituting the dipole antenna is provided so as to be substantially orthogonal to the main surface of the wireless communication terminal. This is achieved by forming directivity in a direction orthogonal to the main surface of the communication terminal. Further, an object of the present invention is to provide a loop surface of the loop antenna so as to be substantially perpendicular to a human body, to provide a circumference of the loop antenna so as to be one wavelength or less, and to have an impedance conversion function. This is achieved by feeding power to the loop antenna via a balanced-unbalanced conversion circuit. BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a schematic diagram showing the configuration of a built-in antenna used in a conventional wireless communication terminal;

FIG. 2 is a schematic diagram showing a configuration of a diversity antenna used in a conventional wireless communication device;

Fig. 3A shows the reception characteristics in the free space of a plate-shaped inverted-F antenna used in a conventional wireless communication terminal;

Figure 3B shows the reception characteristics of a conventional inverted F-shaped antenna used in a conventional wireless communication terminal during a call;

Figure 4A is a diagram showing the radiation characteristics in the free space of a plate-shaped inverted-F antenna used for a conventional wireless communication terminal; Figure 4B is a diagram showing the radiation characteristics of a conventional inverted F-shaped antenna used in a conventional wireless communication terminal during a call;

FIG. 5 is a schematic diagram showing a state of a conventional wireless communication terminal during a call; FIG. 6 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 1 of the present invention;

FIG. 7 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 2 of the present invention;

FIG. 8 is a diagram showing actually measured values of reception characteristics of the built-in antenna for a wireless communication device according to Embodiment 1 of the present invention during a call;

FIG. 9 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 3 of the present invention;

FIG. 10 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 4 of the present invention;

FIG. 11 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 5 of the present invention;

FIG. 12 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 6 of the present invention;

FIG. 13 is a schematic diagram showing a configuration of a dipersity antenna for a wireless communication terminal according to Embodiment 7 of the present invention;

FIG. 14 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 8 of the present invention;

FIG. 15 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 9 of the present invention;

FIG. 16 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 10 of the present invention;

FIG. 17 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 11 of the present invention. FIG. 18 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 12 of the present invention;

FIG. 19 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 13 of the present invention;

FIG. 20 is a schematic diagram showing a configuration of a dipole antenna used in Embodiment 14 of the present invention;

FIG. 21 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 15 of the present invention;

FIG. 22 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 16 of the present invention;

FIG. 23 is a schematic diagram showing a configuration of a dipole antenna arranged on circuit board 18 1 in Embodiment 17 of the present invention;

FIG. 24 is a schematic diagram showing a configuration of a dipole antenna arranged on housing case 191, according to Embodiment 18 of the present invention;

FIG. 25 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 19 of the present invention;

FIG. 26 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 20 of the present invention;

FIG. 27 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 21 of the present invention;

FIG. 28 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 22 of the present invention;

FIG. 29 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 23 of the present invention;

FIG. 30 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 24 of the present invention;

FIG. 31 shows a diversity for radio communication terminals according to Embodiment 25 of the present invention. Schematic diagram showing the configuration of the antenna;

FIG. 32 is a schematic diagram showing the configuration of a wireless communication terminal dipole antenna according to Embodiment 26 of the present invention;

FIG. 33 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 27 of the present invention;

FIG. 34 is a schematic diagram showing a configuration of a dipersian antenna for a wireless communication terminal according to Embodiment 28 of the present invention;

FIG. 35 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 29 of the present invention;

FIG. 36 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 30 of the present invention;

FIG. 37 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 31 of the present invention;

FIG. 38 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 32 of the present invention;

FIG. 39 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 33 of the present invention;

FIG. 40 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 34 of the present invention;

FIG. 41 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 35 of the present invention;

FIG. 42 is a schematic diagram showing a configuration of a wireless communication terminal dipole antenna according to Embodiment 36 of the present invention;

FIG. 43 is a schematic diagram showing a configuration of a wireless communication terminal dipersian antenna according to Embodiment 37 of the present invention;

FIG. 44 is a schematic diagram showing the configuration of a radio communication terminal dipersian antenna according to Embodiment 38 of the present invention; FIG. 45 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 39 of the present invention;

FIG. 46 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 40 of the present invention;

FIG. 47 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 41 of the present invention;

FIG. 48 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 42 of the present invention;

FIG. 49 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 43 of the present invention;

FIG. 50 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 44 of the present invention;

FIG. 51 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 45 of the present invention;

FIG. 52 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 46 of the present invention;

FIG. 53 is a schematic diagram showing a configuration of a folded dipole antenna used in Embodiment 47 of the present invention;

FIG. 54 is a schematic diagram showing the configuration of a folded dipole antenna used in the embodiment 48 of the present invention;

FIG. 55 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 49 of the present invention;

FIG. 56 is a front view showing the appearance of a communication terminal device having a built-in antenna for a wireless communication terminal according to Embodiment 49 of the present invention;

FIG. 57 is a cross-sectional view of a built-in antenna for a wireless communication terminal according to Embodiment 49 of the present invention, as viewed in the direction of arrow A in FIG. 50;

FIG. 58 shows a built-in antenna for a wireless communication terminal according to Embodiment 49 of the present invention. FIG. 59 is a schematic diagram showing a state of a built-in wireless communication terminal during a call; FIG. 59 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 50 of the present invention;

FIG. 60 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 51 of the present invention;

FIG. 61 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 52 of the present invention;

FIG. 62 shows measured values of radiation characteristics in free space of the built-in antenna for a wireless communication device according to Embodiment 52 of the present invention;

FIG. 63 shows measured values of radiation characteristics of the built-in antenna for a wireless communication apparatus according to Embodiment 52 of the present invention during a call;

FIG. 64 is a schematic diagram showing a configuration of a wireless communication terminal diversity antenna according to Embodiment 53 of the present invention;

FIG. 65 is a schematic diagram showing a configuration of a wireless communication terminal diversity antenna according to Embodiment 54 of the present invention;

FIG. 66 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 55 of the present invention;

FIG. 67 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 56 of the present invention;

FIG. 68 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 57 of the present invention;

FIG. 69 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 58 of the present invention;

FIG. 70 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 59 of the present invention;

FIG. 71 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 60 of the present invention; FIG. 72 is a diagram showing measured values of reception characteristics of the built-in antenna for a wireless communication apparatus according to Embodiment 60 of the present invention during a call;

FIG. 73 is a schematic diagram showing a configuration of a radio communication terminal built-in antenna according to Embodiment 61 of the present invention;

FIG. 74 is a schematic diagram showing a configuration of a radio communication terminal built-in antenna according to Embodiment 62 of the present invention;

FIG. 75A is a schematic diagram showing a configuration of a first wireless communication terminal built-in antenna according to Embodiment 63 of the present invention;

FIG. 75B is a schematic diagram showing a configuration of a second built-in antenna for a wireless communication terminal according to Embodiment 63 of the present invention;

FIG. 76 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 64 of the present invention;

FIG. 77 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 65 of the present invention;

FIG. 78 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 66 of the present invention;

FIG. 79 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 67 of the present invention;

FIG. 80 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 68 of the present invention;

FIG. 81 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 69 of the present invention;

FIG. 82 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 70 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode of the present invention will be described in detail with reference to the drawings. You.

(Embodiment 1)

FIG. 6 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 1 of the present invention. Each element shown in the figure is mounted in the housing of the wireless communication terminal. The overall diagram of the wireless communication terminal is omitted for the sake of simplicity. The built-in antenna for a wireless communication terminal according to the present embodiment includes a ground plane 11, a dipole antenna 12, a balanced-unbalanced conversion circuit 13, and a power supply end 14. Hereinafter, each component will be described. The ground plane 11 is a plate-like ground conductor, and is attached so as to be substantially parallel to a surface (vertical surface) of the wireless communication terminal on which an operation button (not shown), a display, a speaker, and the like are provided.

The dipole antenna 12 is composed of two antenna elements formed in a rectangular wave shape (comb blade shape). As a result, the dipole antenna is reduced in size. The two antenna elements constituting the dipole antenna 12 are arranged such that their longitudinal directions are substantially straight.

The dipole antenna 12 is mounted so that the longitudinal direction of the antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. As a result, the dipole antenna 12 is provided so that the longitudinal direction of the antenna element is substantially perpendicular to the horizontal plane. As a result, the dipole antenna 12 receives mainly vertically polarized waves parallel to the longitudinal direction in free space. Further, in a call state, the human body operates as a reflector, so that the dipole antenna 12 has directivity in a direction opposite to the human body direction.

The balance-unbalance conversion circuit 13 is a conversion circuit having an impedance conversion ratio of 1 to 1 or n to 1 (n is an integer), and is attached to the feed end 14 of the dipole antenna 12. One terminal of the balance-unbalance conversion circuit 13 is connected to a transmission / reception circuit (not shown), and the other terminal is attached to the ground plane 11. As a result, the balance-unbalance conversion circuit 13 becomes a dipole antenna 1 2 Since impedance conversion is performed between the transmitting and receiving circuit and the transmitting and receiving circuit, impedance matching between the two can be properly performed. Furthermore, since the unbalanced conversion circuit 13 converts the unbalanced signal of the transmission / reception circuit into a balanced signal and supplies the balanced signal to the dipole antenna 12, the current flowing through the ground plane 11 can be minimized. This prevents the ground plate 11 from acting as an antenna, so that a decrease in the gain of the dipole antenna 12 due to the influence of the human body can be suppressed. Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit is converted to a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 12. The dipole antenna 12 fed in this way mainly transmits vertically polarized waves parallel to this longitudinal direction. Upon reception, a vertically polarized wave parallel to the longitudinal direction is received. Therefore, in free space, vertically polarized waves are received from all directions centering on the dipole antenna. In a call state, the human body becomes a reflector as described above. Vertically polarized waves from the direction opposite to the human body are mainly received.

The above signal (balanced signal) received by the dipole antenna 12 is sent to the transmission / reception circuit via the balance-unbalance conversion circuit 13. Since the current flowing through the ground plane 11 is suppressed as much as possible by the unbalanced conversion circuit 13, the antenna operation by the ground plane 11 is prevented. As a result, the decrease in gain due to the influence of the human body is minimized.

Here, the reception characteristics of the built-in antenna for a wireless communication terminal having the above configuration will be described with reference to FIG. FIG. 8 is a diagram showing measured values of reception characteristics of the built-in antenna for a wireless communication device according to the present embodiment in a call state. In addition, the size of the ground plane 11 is 120 × 36 mm, the size of the dipole antenna 12 is 63 × 5 mm, the distance of the dipole antenna 12 from the human body surface is 5 mm, and the frequency is 2 18 0 MHz. In addition, in FIG. 8, the direction of 270 degrees as viewed from the origin corresponds to the direction of the human body as viewed from the dipole antenna 12 in FIG. As is clear from FIG. 8, the dipole antenna 12 has directivity in a direction opposite to the direction of the human body due to the influence of the human body acting as a reflector. In addition, the directivity is prevented from being cracked for the above-described reason, and has a high gain characteristic in which the deterioration of the gain is suppressed as compared with the conventional example shown in FIG. 3B.

As described above, according to the present embodiment, by appropriately adjusting the impedance in the balanced-unbalanced conversion circuit 13, the antenna current flowing through the ground plane 11 can be suppressed as much as possible. Caused by dipole antenna

The gain deterioration of 12 can be suppressed. Further, since the dipole antenna 12 is formed by a rectangular wave-shaped antenna element, the size of the built-in antenna for a wireless communication terminal can be reduced. Therefore, it is possible to provide a high-gain and small built-in antenna for a wireless communication terminal which is less affected by the human body.

(Embodiment 2)

Embodiment 2 is an embodiment in which the method of mounting dipole antenna 12 in Embodiment 1 is changed. The second embodiment is the same as the first embodiment except for the method of attaching the dipole antenna 12, and thus a detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 1 will be described with reference to FIG. The same parts as in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 7 is a schematic diagram illustrating a configuration of a built-in antenna for a wireless communication terminal according to the second embodiment. As shown in this figure, the built-in antenna for a wireless communication terminal according to the second embodiment includes a ground plane 11, a dipole antenna 12, a balanced-unbalanced conversion circuit 13, and a power supply end 14. It is composed.

The dipole antenna 12 is mounted such that the longitudinal direction of the antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. That is, the present embodiment is different from Embodiment 1 in that dipole antenna 12 is mounted such that the longitudinal direction of dipole antenna 12 is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. As a result, the dipole antenna 12 can suppress the deterioration of the gain and can receive mainly horizontally polarized waves parallel to the longitudinal direction. At this point, the signal sent from the communication partner is a mixture of vertical and horizontal polarizations due to various factors such as reflection. Therefore, when there are many horizontal polarizations, the longitudinal direction of the antenna coincides with the plane of polarization, so that the reception gain can be increased.

As described above, according to the present embodiment, dipole antenna 12 is mounted such that the longer direction is substantially parallel to the upper surface of the wireless communication terminal, so that gain deterioration due to the influence of the human body is suppressed. And can receive mainly horizontally polarized waves. Therefore, it is possible to prevent gain deterioration due to mismatch of the polarization plane with the signal from the communication partner, and to provide a high-gain and small built-in antenna for a wireless communication terminal which is less affected by the human body. it can.

(Embodiment 3)

Embodiment 3 is an embodiment in which the configuration and mounting method of dipole antenna 12 in Embodiment 1 are changed. The third embodiment is the same as the first embodiment except for the configuration and the mounting method of the dipole antenna, and thus a detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 1 will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 9 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 3. As shown in this figure, the built-in antenna for a wireless communication terminal according to the third embodiment includes a ground plane 11, a dipole antenna 41, a balanced-unbalanced conversion circuit 13, and a power supply terminal 14. It is composed. The two antenna elements constituting the dipole antenna 41 are arranged such that their longitudinal directions are substantially perpendicular to each other.

In the dipole antenna 41, the longitudinal direction of one antenna element is The antenna is mounted so that it is substantially perpendicular to the top surface (horizontal plane) of the end and the longitudinal direction of the other antenna element is substantially parallel to the top plane (horizontal plane) of the wireless communication terminal.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit is converted to a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 41. The antenna element arranged substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 41 thus fed mainly transmits vertically polarized waves parallel to the longitudinal direction of the antenna element. Is done. At the time of reception, a vertically polarized wave parallel to the longitudinal direction is received. On the other hand, the antenna element arranged substantially in parallel to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 41 similarly supplied with power causes mainly horizontal polarization parallel to the longitudinal direction of the antenna element. Sent. At the time of reception, horizontal polarization parallel to the longitudinal direction is received. In free space, vertical and horizontal polarized waves are received from all directions around the dipole antenna. In a talking state, the human body serves as a reflector as described above, and therefore, of the vertical polarization and the horizontal polarization, waves mainly from the opposite direction to the human body are received.

As a result, the dipole antenna 12 can suppress the deterioration of the gain and can receive both vertically polarized waves and horizontally polarized waves parallel to the longitudinal direction. By the way, the signal sent from the communication partner is a mixture of vertical polarization and horizontal polarization due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner, and thus the reception gain Can be higher.

As described above, according to the present embodiment, since the antenna current flowing through the ground plane 11 can be minimized by the balance-unbalance conversion circuit 13, the gain caused by the influence of the human body of the dipole antenna 41 is obtained. Deterioration can be suppressed. Furthermore, since the dipole antenna 41 is constituted by a rectangular wave-shaped antenna element, The built-in antenna for the wireless communication terminal can be reduced in size. Therefore, it is possible to provide a small, high-gain built-in antenna for a wireless communication terminal that is less affected by the human body.

(Embodiment 4)

Embodiment 4 is an embodiment in which the shape and mounting method of the antenna element forming the dipole antenna 12 in Embodiment 1 are changed. The fourth embodiment is the same as the first embodiment except for the shape of the antenna element and the mounting method of the dipole antenna, and a detailed description thereof will be omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 1 will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 10 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 4. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 4 includes a ground plane 11, a dipole antenna 51, a balanced-unbalanced conversion circuit 13, and a feeding end 14. It is configured to have. The antenna elements constituting the dipole antenna 51 are bent near the center, and are formed such that the bent surfaces are substantially perpendicular to each other. In this case, the surface having the feeding end 14 among the surfaces perpendicular to each other of the antenna elements is referred to as a first rectangular wavefront, and the surface having no feeding end 14 is referred to as a second rectangular wavefront. That.

The antenna element constituting the dipole antenna 51 having the above configuration is mounted such that the longitudinal direction of the first rectangular wavefront is substantially parallel to the upper surface (horizontal plane) of the wireless communication device. Further, the antenna element is mounted such that the longitudinal direction of the second rectangular wavefront is substantially perpendicular to the upper surface (horizontal plane) of the radio communication device.

That is, in the present embodiment, the longitudinal direction of the first rectangular wavefront of dipole antenna 51 is substantially parallel to the upper surface of the wireless communication terminal, and the longitudinal direction of the second rectangular wavefront is substantially perpendicular to the upper surface of the wireless communication terminal. This embodiment differs from the first embodiment in that it can be mounted as described above. As a result, the dipole antenna 51 As in state 1, during a call, the longitudinal direction of the first rectangular wavefront is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal, and the longitudinal direction of the second rectangular wavefront is equal to the upper surface ( This means that it is provided almost perpendicular to the horizontal plane.

As described above, in the present embodiment, even with the above-described configuration, the same effects as those of the third embodiment can be obtained.

(Embodiment 5)

Embodiments 5 to 11 are modes in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal in Embodiments 1 to 4.

Embodiment 5 is an embodiment in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal in Embodiment 1. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 11 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to the fifth embodiment. In FIG. 11, a monopole antenna 61 is further provided in the configuration of the built-in antenna for a wireless communication terminal in the first embodiment.

Here, one of the antennas constituting the diversity antenna is designated as the dipole antenna 12 in the first embodiment and is dedicated to reception. The other antenna constituting the diversity antenna is used as a monopole antenna 61 for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 61 operates at the time of transmission, and the dipole antennas 12 and 61 operate at the time of reception to perform diversity reception. As described above, according to the present embodiment, the diversity antenna Since dipole antenna 12 in Embodiment 1 is used, a small-sized diversity antenna for wireless communication terminals that is less affected by a human body and has a high gain can be provided as in Embodiment 1.

(Embodiment 6)

Embodiment 6 is an embodiment in which the configuration of the monopole antenna in Embodiment 5 is changed. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in the fifth embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 12 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 6. As shown in FIG. 12, the diversity antenna for a wireless communication terminal according to the sixth embodiment includes a dipole antenna 12, a balance-unbalance conversion circuit 13, a feed end 14, and a monopole antenna. 7 and 1. The monopole antenna 71 is composed of an antenna element formed in a rectangular wave shape.

In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 71 operates at the time of transmission, and at the time of reception, the dipole antenna 12 and the monopole antenna 71 operate to perform diversity reception. As described above, according to the present embodiment, since the dipole antenna 12 in Embodiment 1 is used as the diversity antenna, it is possible to provide a high-gain radio communication terminal diversity antenna that is less affected by the human body. You. Further, since the monopole antenna 71 has a rectangular wave shape, the external antenna can be reduced in size.

(Embodiment 7)

Embodiment 7 is an embodiment in which the configuration of the monopole antenna is changed in Embodiment 5. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in the fifth embodiment are denoted by the same reference numerals, and detailed description is omitted. FIG. 13 is a schematic diagram showing a configuration of a dipersibility antenna for a wireless communication terminal according to Embodiment 7. As shown in this figure, the diversity antenna for wireless communication terminal according to the seventh embodiment includes a dipole antenna 12, a balanced-unbalanced conversion circuit 13, a feed end 14 and a monopole antenna 81. It is configured to have. The monopole antenna 81 is composed of a spirally formed antenna element.

In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 81 operates at the time of transmission, and the dipole antenna 12 and the monopole antenna 81 operate at the time of reception, thereby performing diparticity reception. As described above, in the present embodiment, even with the above configuration, the same effect as in the sixth embodiment can be obtained.

(Embodiment 8)

Embodiment 8 is a form of realizing a diversity antenna using the built-in antenna for a wireless communication terminal in Embodiment 1. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 14 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to the eighth embodiment. As shown in this figure, the dipole antenna 91 is further provided on the side surface of the ground plane 11 in the configuration of the built-in antenna for a wireless communication terminal according to the first embodiment. The dipole antenna 91 has the same configuration as the dipole antenna 12.

Here, one of the antennas constituting the diversity antenna is designated as dipole antenna 12 in the first embodiment and is dedicated to reception. The other antenna constituting the diversity antenna is a dipole antenna 91 and is used for both transmission and reception.

In the wireless communication terminal diversity antenna having the above configuration, Only the dipole antenna 91 operates, and at the time of reception, the dipole antennas 12 and 91 operate to perform diversity reception. As described above, according to the present embodiment, dipole antenna 12 and dipole antenna 91 in Embodiment 1 are used as diversity antennas, so that a high-gain radio communication terminal that is less affected by a human body. Diversity antennas can be provided. Furthermore, since the dipole antenna 91 is formed in a rectangular waveform, the size of the diversity antenna can be reduced.

(Embodiment 9)

Embodiment 9 is an embodiment in which the method of mounting dipole antenna 91 in Embodiment 8 is changed. The ninth embodiment is the same as the eighth embodiment except for the method of attaching the dipole antenna 91, and thus a detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 8 will be described with reference to FIGS. The same parts as in the eighth embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 15 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 9. As shown in this figure, dipole antenna 91 is mounted such that its longitudinal direction is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. That is, the present embodiment is different from Embodiment 8 in that dipole antenna 12 is mounted such that the longitudinal direction of dipole antenna 12 is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. As a result, the dipole antenna 91 is provided so that this longitudinal direction is substantially perpendicular to the human body and at the same time substantially parallel to the horizontal plane during a call.

In the diversity antenna for a wireless communication terminal having the above configuration, only dipole antenna 91 operates during transmission, and during reception, dipole antennas 12 and 91 operate to perform diversity reception. Thus, the dipole antenna 1 2 can suppress the deterioration of the gain. As well as receiving mainly vertically polarized waves parallel to the longitudinal direction of the antenna element. Further, the dipole antenna 91 can suppress the deterioration of the gain and can receive mainly horizontally polarized waves parallel to the longitudinal direction of the antenna element. By the way, the signal transmitted from the communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for a radio communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner, and thus the reception is performed. The gain can be increased.

As described above, according to the present embodiment, dipole antenna 12 and dipole antenna 91 in Embodiment 1 are used as the diversity antennas, so that a high-gain radio communication terminal diversity that is less affected by a human body. Antenna can be provided. Furthermore, since the dipole antenna 91 has a rectangular shape, the size of the diversity antenna can be reduced.

(Embodiment 10)

As shown in FIG. 16, the tenth embodiment is a modification of the eighth embodiment in which the dipole antenna used for both transmission and reception is changed to the dipole antenna 41 of the third embodiment. Embodiment 10 is the same as Embodiment 8 except for the configuration and mounting method of the dipole antenna. In FIG. 16, the same parts as those in the eighth embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 16 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 10. As shown in this figure, in the dipole antenna 41, the longitudinal direction of one antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and the longitudinal direction of the other antenna element is the upper surface (horizontal plane) of the wireless communication terminal. ) Is attached so as to be approximately parallel to.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 41 operates during transmission, and the dipole antenna 1 operates during reception. 2 and the dipole antenna 41 operate to perform diversity reception. As a result, the dipole antenna 41 can suppress the deterioration of the gain and can receive mainly vertically polarized waves and horizontally polarized waves parallel to the longitudinal direction of the antenna element. In addition, the dipole antenna 12 can suppress the deterioration of the gain and can receive mainly vertically polarized waves parallel to the longitudinal direction of the antenna element. By the way, a signal transmitted from a communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner. The receiving gain can be increased.

As described above, according to the present embodiment, dipole antennas 12 and 41 in Embodiment 1 are used as the dipersity antennas, and therefore, a high-gain radio communication terminal diversity that is less affected by a human body. An antenna can be provided. Furthermore, since the dipole antenna 41 has a rectangular waveform, the diversity antenna can be made smaller.

(Embodiment 11)

As shown in FIG. 17, the eleventh embodiment differs from the tenth embodiment in that the dipole antenna used for reception is the same as the dipole antenna 41 of the third embodiment. It is assumed to be 1. Embodiment 11 is the same as Embodiment 8 except for the configuration and mounting method of the dipole antenna. In FIG. 17, the same parts as those in the eighth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 17 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 11. As shown in this figure, in dipole antenna 41 and dipole antenna 121, the longitudinal direction of one antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and the longitudinal direction of the other antenna element is It is installed so that it is almost parallel to the upper surface (horizontal surface) of the wireless communication terminal. In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 41 operates at the time of transmission, and at the time of reception, the dipole antenna 41 and the dipole antenna 121 operate to perform diversity reception. As a result, the dipole antenna 41 can suppress the deterioration of the gain and can receive mainly vertically polarized waves and horizontally polarized waves parallel to the longitudinal direction of the antenna element. Further, the dipole antenna 12 1 can suppress the deterioration of the gain and can receive mainly vertically polarized waves parallel to the longitudinal direction of the antenna element. By the way, the signal sent from the communication partner is a mixture of vertical polarization and horizontal polarization due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner. However, the reception gain can be increased.

As described above, according to the present embodiment, since the dipole antennas 121 and 41 of Embodiment 1 are used as the diversity antennas, a high-gain radio communication terminal that is less affected by the human body is used. A diversity antenna can be provided. Further, since the dipole antenna 41 has a rectangular wave shape, the diversity antenna can be downsized. (Embodiment 12)

Embodiment 12 is a dipole used in Embodiments 1 to 11, Embodiments 17 to 42 described below, and Embodiments 49 to 59 described later. This is a modification of the antenna configuration.

FIG. 18 is a schematic diagram showing a configuration of folded dipole antenna 1331 according to Embodiment 12. As shown in this figure, the folded dipole antenna 13 1 according to Embodiment 12 has two sets of rectangular wave-shaped antenna elements arranged in parallel, and the tip ends of the two sets of antenna elements arranged in parallel. It is formed by short-circuiting. The folded dipole antenna 13 1 having the above-described configuration includes the antennas according to Embodiments 1 to 11, Embodiments 17 to 42 described below, and Embodiments 49 to 59 described later. It can be applied as a built-in antenna for line communication terminals or as a dipole antenna constituting a diversity antenna.

Thus, by applying the folded dipole antenna 131 as a dipole antenna to the configuration of each of the above embodiments, the same effect as in each of the above embodiments can be obtained. And impedance matching can be easily performed.

(Form, form 13)

Embodiment 13 is a modification of the configuration of the dipole antenna used in Embodiment 12. Embodiment 13 is the same as Embodiment 12 except for the configuration of the dipole antenna.

FIG. 19 is a schematic diagram showing a configuration of a folded dipole antenna 141 used in the thirteenth embodiment. As shown in the figure, the folded dipole antenna 14 1 according to Embodiment 13 has two sets of rectangular wave-shaped antenna elements arranged in parallel, and an impedance element is provided at the tip of the two sets of antenna elements arranged in parallel. It is formed by loading 1 4 2.

The folded dipole antenna 14 1 having the above configuration includes the built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described below, and Embodiments 49 to 59 described below. The present invention is applicable as a dipole antenna constituting a diversity antenna.

In this way, by applying the folded dipole antenna 141 as a dipole antenna to the configuration of each of the above embodiments, the same effects as those of the above embodiments can be obtained, and the impedance can be stepped up. Since then, impedance matching can be easily performed. In addition, by using the folded dipole antenna 141 of the above configuration as the dipole antenna, a wider band can be achieved, and the antenna can be further reduced in size.

(Embodiment 14)

Embodiment 14 is a dipole antenna used in each of the above embodiments. This is a modification of the tena configuration. Embodiment 14 is the same as Embodiment 12 except for the configuration and mounting method of the dipole antenna. FIG. 20 is a schematic diagram showing a configuration of dipole antenna 151 used in Embodiment 14. As shown in this figure, the dipole antenna 151 according to the embodiment 14 is composed of a spirally formed antenna element. The folded dipole antenna 15 1 having the above-described configuration includes a built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described below, and Embodiments 49 to 59 described below. It can be applied as a dipole antenna that constitutes a dipersity antenna.

In this way, by forming the dipole antenna from the spiral antenna element, the antenna can be further reduced in size.

(Embodiment 15)

Embodiment 15 is a modification of the configuration of the dipole antenna used in each of the above embodiments.

FIG. 21 is a schematic diagram showing a configuration of a folded dipole antenna 161 used in the fifteenth embodiment. As shown in this figure, the folded dipole antenna 161 according to the fifteenth embodiment has two sets of spiral dipole antenna elements described in the fifteenth embodiment arranged in parallel. It is formed by short-circuiting the tips of a set of antenna elements.

The folded dipole antenna 161 having the above-described configuration includes the built-in antenna for a radio communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described later, and Embodiments 49 to 59 described later. It can be applied as a dipole antenna constituting a diversity antenna.

In this way, by applying the folded dipole antenna 161 as a dipole antenna to the configuration of each of the above embodiments, the same effect as in each of the above embodiments can be obtained, and the impedance is stepped up. And impedance matching can be easily performed. Also, dipole By using the folded dipole antenna 161 having the above configuration for the antenna, the antenna can be further reduced in size.

(Embodiment 16)

Embodiment 16 is a modification of the configuration of the dipole antenna used in Embodiment 15. Embodiment 16 is the same as Embodiment 15 except for the configuration and mounting method of the dipole antenna.

FIG. 22 is a schematic diagram showing a configuration of the folded dipole antenna 171 used in the sixteenth embodiment. As shown in this figure, the folded dipole antenna 171 according to the embodiment 16 has two sets of the spiral dipole antenna elements described in the embodiment 14 arranged in parallel. It is formed by loading an impedance element 142 at the tip of the two sets of arranged antenna elements.

The folded dipole antenna 171 having the above-described configuration includes a built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described below, and Embodiments 49 to 59 described below. The present invention is applicable as a dipole antenna constituting a diversity antenna.

As described above, by applying the folded dipole antenna 171 as the dipole antenna, the same effect as that of the embodiment 12 can be obtained. In addition, a wider band and a smaller size can be achieved.

Since the dipole antennas 13 1, 14 1, 16 1, and 17 1 have a self-balancing effect, a balanced-unbalanced conversion circuit is used in Embodiments 12 to 16. 13 may be omitted.

(Embodiment 17)

Embodiment 17 is a form in which dipole antenna 12 shown in Embodiment 1 is arranged in a pattern on circuit board 18 1.

FIG. 23 is a schematic diagram showing a configuration of a dipole antenna 12 arranged on circuit board 18 1 in the seventeenth embodiment. As shown in this figure, the die The pole antenna 12 is arranged in a pattern on the circuit board 18 1. As described above, in the present embodiment, since the dipole antenna 12 shown in the first embodiment is used, the same effect as in the first embodiment can be obtained. Further, since dipole antenna 12 shown in the first embodiment is arranged in a pattern on circuit board 181, stable characteristics can be obtained.

In this embodiment, the dipole antenna shown in each of the above embodiments may be arranged in a pattern on circuit board 1811.

(Embodiment 18)

Embodiment 18 is an embodiment in which dipole antenna 12 shown in each of the above embodiments is arranged in a pattern on housing case 91.

FIG. 24 is a schematic diagram showing a configuration of dipole antenna 12 arranged on housing case 19 1 in Embodiment 18. As shown in the figure, the dipole antenna 12 is arranged in a pattern on the circuit board 191.

As described above, in the present embodiment, since the dipole antenna 12 shown in the first embodiment is used, the same effect as in the first embodiment can be obtained. Further, since the dipole antenna 12 shown in the first embodiment is arranged in a pattern on the housing case 191, stable characteristics can be obtained, and the installation space of the antenna can be omitted. The size of the device can be reduced.

In this embodiment, the dipole antenna shown in each of the above embodiments may be arranged in a pattern on the circuit board 1811.

(Embodiment 19)

Embodiment 19 is an embodiment in which the configuration of dipole antenna 12 in Embodiment 1 is changed. Embodiment 19 is the same as Embodiment 1 except for the configuration of dipole antenna 12, so a detailed description will be given. Omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 1 will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. FIG. 25 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 19. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 19 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, a feed end 14, and a dipole antenna 201. It is configured to have. One of the two antenna elements constituting the dipole antenna 201 is formed in a rectangular wave shape, and the other is formed in a rod shape. The two antenna elements are arranged such that their longitudinal directions are substantially on a straight line. The rod-shaped antenna element is arranged outside a wireless communication terminal (not shown).

The dipole antenna 201 is attached such that the longitudinal direction of the antenna element formed in a rectangular wave shape is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. Further, the antenna element is mounted such that the longitudinal direction of the rod-shaped antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal.

As described above, in the dipole antenna 201, the axial direction of the rod-shaped antenna element and the longitudinal direction of the rectangular wave-shaped antenna element are substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. It is attached to become. Thus, in free space, dipole antenna 201 mainly receives vertical polarization parallel to the axial direction of the rod-shaped antenna element and the longitudinal direction of the rectangular-shaped antenna element. Furthermore, during a call, the human body operates as a reflector, and the dipole antenna 201 has a directivity in the direction opposite to the human body direction.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit is converted into a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 201. Due to the dipole antenna 201 fed in this way, mainly the vertical parallel to this longitudinal direction The polarization is transmitted. Upon reception, a vertically polarized wave parallel to the longitudinal direction is received. Therefore, in free space, vertical polarized waves are received from all directions centering on the dipole antenna, and during a call, the human body becomes a reflector as described above. Vertically polarized waves from the opposite direction to the human body are mainly received.

As described above, the dipole antenna 201 can suppress the deterioration of the gain and can receive mainly vertically polarized waves parallel to the longitudinal direction. By the way, a signal transmitted from a communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, when there are many vertical polarizations, the built-in antenna for a wireless communication terminal according to the present embodiment matches the polarization plane of the signal sent from the communication partner, so that the reception gain can be increased.

The above-mentioned signal (balanced signal) received by the dipole antenna 201 is sent to the transmission / reception circuit via the balanced-unbalanced conversion circuit 13. Here, the current flowing through the ground plane 11 is suppressed as much as possible by the above-described balance-unbalance conversion circuit 13, so that the antenna operation by the ground plane 11 is prevented. This minimizes the decrease in gain due to the effects of the human body.

As described above, according to the present embodiment, the antenna current flowing through the ground plane 11 can be suppressed as much as possible by the balance-unbalance conversion circuit 13, and this is caused by the influence of the human body of the dipole antenna 201. Gain deterioration can be suppressed. Furthermore, since one antenna element of the dipole antenna 201 is formed in a rectangular wave shape, the size of the built-in antenna for a wireless communication terminal can be reduced. Therefore, it is possible to provide a high-gain and small built-in antenna for a wireless communication terminal which is less affected by the human body.

(Embodiment 20)

Embodiment 20 is an embodiment in which the configuration and mounting method of dipole antenna 201 in Embodiment 19 are changed. Embodiment 20 is the same as Embodiment 2 except for the configuration and mounting method of the dipole antenna 201. Since this is the same as Embodiment 19, detailed description will be omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 19 will be described with reference to FIG. The same parts as those in Embodiment 19 are denoted by the same reference numerals and detailed description is omitted.

FIG. 26 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 20. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 20 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, a feeding end 14, and a dipole antenna 211. It is configured to have. The two antenna elements forming the dipole antenna 211 are arranged such that the longitudinal direction of the rectangular-shaped antenna element and the longitudinal direction of the rod-shaped antenna element are substantially orthogonal to each other.

The dipole antenna 211 is attached so that the longitudinal direction of the rectangularly shaped antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. Further, the antenna element is mounted such that the longitudinal direction of the rod-shaped antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. That is, the present embodiment is different from embodiment 19 in that dipole antenna 12 is mounted such that the longitudinal direction of radio pole is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmitting / receiving circuit is converted to a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 2 11. Vertically polarized waves are mainly transmitted by the rod-shaped antenna element arranged substantially perpendicularly to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 211 thus fed. Upon reception, a vertically polarized wave parallel to the longitudinal direction is received. On the other hand, a rectangular wave antenna element arranged substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 12 similarly supplied with power feeds mainly horizontally polarized waves parallel to this longitudinal direction. Is done. At the time of reception, horizontal polarization parallel to the longer direction is received. Therefore, in free space, Vertical and horizontal polarized waves are received from all directions around the dipole antenna, and during a call, the human body becomes a reflector as described above. Of these, waves from the direction opposite to the human body are mainly received.

As a result, the dipole antenna 211 can suppress the deterioration of the gain and can receive both vertically polarized waves and horizontally polarized waves. At this point, the signal sent from the communication partner is a mixture of vertical and horizontal polarizations due to various factors such as reflection. That is, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner, so that the reception gain can be reduced. Can be higher.

As described above, according to the present embodiment, the same effects as those of the embodiment 20 can be obtained.

(Embodiment 21)

Embodiment 21 is an embodiment in which the configuration and mounting method of dipole antenna 201 in Embodiment 19 are changed. Embodiment 21 is the same as Embodiment 19 except for the configuration and mounting method of dipole antenna 201, and therefore, detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 19 will be described with reference to FIG. The same parts as those in Embodiment 19 are denoted by the same reference numerals and detailed description is omitted.

FIG. 27 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 21. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 21 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, a feeding end 14, and a dipole antenna 2 21. It is configured to have. The two antenna elements constituting the dipole antenna 2 21 are bent near the center, and the side having the feeding end 14 of the bent antenna element is formed in a rectangular wave shape. The side having no terminal 14 is formed in a rod shape. In the dipole antenna 2 21, the longitudinal directions of the rectangular wave-shaped portions of the antenna elements are arranged substantially in a straight line. Further, the rod-shaped portion of the antenna element is arranged outside the housing of the wireless communication terminal (not shown).

The longitudinal direction of the rectangular wave-shaped portion of the antenna element constituting the dipole antenna 2 21 having the above configuration is such that each of the bent sides is substantially parallel to the upper surface (horizontal plane) of the wireless communication device. It is attached. In this case, the rod-shaped portion of the antenna element is positioned so as to be substantially perpendicular to the upper surface (horizontal plane) of the wireless communication device.

The dipole antenna 2 21 is mounted so that the longitudinal direction of the rectangular wave-shaped portion of the antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. By attaching in this manner, the rod-shaped portion of the antenna element has its axial direction substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit is converted into a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 2 21. The rod-shaped portion of the antenna element arranged substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 2 21 fed in this way mainly causes vertical polarization parallel to this axial direction. Sent. At the time of reception, a vertically polarized wave parallel to the axial direction is received. On the other hand, the rectangular wave-shaped portion of the antenna element arranged substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 12 that is similarly fed mainly causes horizontal polarization parallel to this longitudinal direction. Is sent. At the time of reception, horizontal polarization parallel to the longitudinal direction is received. Therefore, in free space, vertical and horizontal polarized waves are received from all directions around the dipole antenna, and during a call, the human body becomes a reflector as described above. Of the above-mentioned vertical polarization, mainly vertical polarization and horizontal polarization from the direction opposite to the human body are received. As described above, the dipole antenna 221 can suppress the deterioration of the gain, and can mainly perform the horizontal polarization parallel to the longitudinal direction of the rectangular wave portion and the vertical polarization parallel to the axial direction of the rod portion. S wave can be transmitted. By the way, a signal transmitted from a communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, regardless of whether vertical polarization or horizontal polarization is large, the built-in antenna for a wireless communication terminal according to the present embodiment matches the polarization plane of a signal sent from a communication partner, and The gain can be increased.

(Embodiment 22)

Embodiment 22 is an embodiment in which the configuration of the rod-shaped antenna element forming the dipole antenna 201 in Embodiment 19 is changed. Hereinafter, the antenna for a wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiment 19 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 28 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 22. As shown in FIG. 28, the antenna for a radio communication terminal according to Embodiment 22 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, and a dipole antenna 231. Be composed. The dipole antenna 231 adopts a configuration in which, out of the antenna elements constituting the dipole antenna 201, a rod-shaped antenna element is formed in a rectangular wave shape.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit is converted to a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 2 31. The dipole antenna 231, fed in this way, is arranged so that its longitudinal direction is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. Transmit vertical polarization. Further, at the time of reception, a vertically polarized wave parallel to the longitudinal direction is received. Therefore, in free space, vertical polarized waves are received from all directions with the dipole antenna as the center, and in a talking state, the human body becomes a reflector as described above. Of these, vertical polarization from the direction opposite to the human body is mainly received.

As described above, the dipole antenna 2 31 can suppress the deterioration of the gain and can receive mainly vertically polarized waves parallel to the longitudinal direction of the antenna element. By the way, the signal sent from the communication partner is a mixture of vertical polarization and horizontal polarization due to various factors such as reflection. Therefore, when there is a large amount of vertical polarization, the built-in antenna for a wireless communication terminal according to the present embodiment matches the polarization plane of a signal transmitted from a communication partner, and can increase the reception gain.

Thus, according to the present embodiment, the same effects as in Embodiment 19 can be obtained, and the external antenna can be made smaller.

(Embodiment 23)

Embodiment 23 is an embodiment in which the configuration of the rod-shaped antenna element of the antenna elements forming dipole antenna 211 in Embodiment 20 is changed. Hereinafter, the antenna for a wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in Embodiment 20 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 29 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 2'3. As shown in FIG. 29, the antenna for a wireless communication terminal according to Embodiment 23 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, and a dipole antenna 241. Be composed. The dipole antenna 241 employs a configuration in which a rod-shaped antenna element of the antenna elements constituting the dipole antenna 211 is changed to a rectangular wave shape.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit is converted into a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 2 41. The dipole antenna 241 fed in this manner has one longitudinal direction arranged substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and the other longitudinal direction substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. , Transmitting vertically polarized waves and horizontally polarized waves parallel to the longitudinal direction. In the case of reception, a vertical polarization and a horizontal polarization parallel to the longitudinal direction are received. Therefore, in free space, vertical and horizontal polarized waves are received from all directions centering on the dipole antenna. In a call state, the human body becomes a reflector as described above. Of the polarization and the horizontal polarization, the vertical polarization from the direction opposite to the human body is mainly received. As described above, the dipole antenna 241 can suppress the deterioration of the gain, and can mainly receive the vertical polarization and the horizontal polarization parallel to the longitudinal direction. The dipole antenna 241 can suppress the deterioration of the gain and can receive mainly horizontally polarized waves parallel to the longitudinal direction. At this point, the signal sent from the communication partner is a mixture of vertical and horizontal polarizations due to various factors such as reflection. Therefore, even if there is much vertical polarization or horizontal polarization, the built-in antenna for a wireless communication terminal according to the present embodiment matches the polarization plane of the signal sent from the communication partner, and thus receives the signal. The gain can be increased.

As described above, according to the present embodiment, the same effects as those of Embodiment 20 can be obtained, and the size of the external antenna can be further reduced.

(Embodiment 24)

Embodiment 24 is an embodiment in which the configuration of the rod-shaped portion of the antenna element forming dipole antenna 22 1 in Embodiment 21 is changed. Hereinafter, the radio communication terminal antenna according to the present embodiment will be described using FIG. The same components as those in Embodiment 21 are denoted by the same reference numerals, and detailed description is omitted. FIG. 30 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 24. As shown in FIG. 30, the antenna for a wireless communication terminal according to Embodiment 24 includes a ground plane 11, a balance-unbalance conversion circuit 13, a feed end 14, and a dipole antenna 25 1. , And. The dipole antenna 25 1 employs a configuration in which a rod-shaped portion of an antenna element constituting the dipole antenna 2 21 is changed to a rectangular wave shape.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit is converted into a balanced signal by the balanced / unbalanced conversion circuit 13, and then sent to the dipole antenna 25 1. The part of the antenna element constituting the dipole antenna 251, which is fed in this way, is arranged substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and mainly due to the part parallel to the longitudinal direction of this part. Vertical polarization is transmitted. Upon reception, a vertically polarized wave parallel to the longitudinal direction is received. On the other hand, a part of the antenna element constituting the dipole antenna 251, which is similarly fed, is arranged substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal, and mainly due to the horizontal direction parallel to the longitudinal direction of this part. The polarization is transmitted. At the time of reception, horizontal polarization parallel to the longitudinal direction is received. Therefore, in free space, vertical and horizontal polarized waves are received from all directions with the dipole antenna as the center. In a talking state, the human body becomes a reflector as described above. Of the polarized wave and horizontal polarized wave, the wave that is the direction opposite to the human body is mainly received.

As described above, the dipole antenna 25 1 can suppress the deterioration of the gain and can receive mainly the vertical polarization and the horizontal polarization parallel to the longitudinal direction of each part of the antenna element. . By the way, a signal transmitted from a communication partner is a mixture of vertical polarization and horizontal polarization due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner, and thus increases the reception gain. Can be higher. As described above, according to the present embodiment, the same effects as those of Embodiment 21 can be obtained, and the size of the external antenna can be further reduced.

(Embodiment 25)

Embodiments 25 to 38 are embodiments in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal according to any of Embodiments 19 to 24.

Embodiment 25 is an embodiment in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal in Embodiment 19. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiment 19 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 31 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 25. As shown in FIG. 31, the diversity antenna according to the present embodiment is configured by further adding a dipole antenna 261 to the configuration of the built-in antenna for a wireless communication terminal in the embodiment 19. The dipole antenna 26 1 has the same configuration as the dipole antenna 201.

Here, one of the antennas constituting the diversity antenna is a dipole antenna 201 in the nineteenth embodiment and is dedicated to reception. The other antenna constituting the diversity antenna is a dipole antenna 261, which is used for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only dipole antenna 261 operates during transmission, and during reception, dipole antenna 201 and dipole antenna 261 operate to perform diversity reception.

As described above, according to the present embodiment, dipole antenna 201 and dipole antenna 261 of Embodiment 19 are used as the diversity antennas, so that the human body is affected by the influence of the human body as in Embodiment 19. Less high gain And a small diversity antenna for wireless communication terminals. (Embodiment 26)

Embodiment 26 is an embodiment in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal according to Embodiment 20. Hereinafter, the diversity antenna for a wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in Embodiment 20 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 32 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 26. As shown in FIG. 32, the diversity antenna according to the present embodiment has a configuration in which a dipole antenna 271 is further provided in the configuration of the built-in antenna for a wireless communication terminal in embodiment 20. The dipole antenna 271 has the same configuration as the dipole antenna 221. Here, one of the antennas constituting the diversity antenna is designated as the dipole antenna 211 in Embodiment 20 and is dedicated to reception. The other antenna constituting the diversity antenna is a dipole antenna 271, which is used for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 271 operates at the time of transmission, and the dipole antenna 211 and the dipole antenna 271 operate at the time of reception to perform diversity reception.

As described above, according to the present embodiment, as the diversity antenna, dipole antenna 211 and dipole antenna 271 in embodiment 20 are used. It is possible to provide a small-sized diversity antenna for a wireless communication terminal with a high gain, which is less affected by the influence.

(Embodiment 27)

Embodiment 27 is an embodiment in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal according to Embodiment 22. Below A diversity antenna for a wireless communication terminal according to the present embodiment will be described with reference to FIG. Note that the same components as those in Embodiment 22 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 33 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 27. As shown in FIG. 33, the diversity antenna according to the present embodiment employs a configuration in which a dipole antenna 281 is further provided in the configuration of the built-in antenna for a wireless communication terminal in embodiment 22. . The dipole antenna 281 has the same configuration as the dipole antenna 231. Here, one of the antennas constituting the diversity antenna is a dipole antenna 2 31 in the embodiment 22 and is dedicated to reception. Also, the other antenna constituting the diversity antenna is a dipole antenna 281 and is used for both transmission and reception.

In the diversity antenna for wireless communication terminals having the above configuration, only dipole antenna 281 operates at the time of transmission, and at reception, dipole antennas 231 and 281 operate to perform diversity reception.

As described above, according to the present embodiment, as the diversity antenna, dipole antenna 2 31 and dipole antenna 281 in Embodiment 22 are used, and thus, as in Embodiment 22, a human body is used. It is possible to provide a small-sized diversity antenna for a wireless communication terminal with a high gain, which is less affected by the influence.

(Embodiment 28)

Embodiment 28 is an embodiment in which a diversity antenna is realized using the built-in antenna for a wireless communication terminal according to Embodiment 23. Hereinafter, the dipersibility antenna for a wireless communication terminal according to the present embodiment will be described with reference to FIG. The same components as those in Embodiment 23 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 34 shows a diversity antenna for a wireless communication terminal according to Embodiment 28. It is a schematic diagram which shows a structure. As shown in FIG. 34, the diversity antenna according to the present embodiment employs a configuration in which a dipole antenna 291 is further provided in the configuration of the built-in antenna for a wireless communication terminal in embodiment 23. . The dipole antenna 291 has the same configuration as the dipole antenna 241. Here, one of the antennas constituting the diversity antenna is designated as dipole antenna 241 in the embodiment 23 and is dedicated to reception. The other antenna constituting the diversity antenna is a dipole antenna 291, which is used for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 291 operates at the time of transmission, and the dipole antenna 241 and the dipole antenna 291 operate at the time of reception to perform diversity reception. You.

As described above, according to the present embodiment, as the diversity antennas, dipole antenna 241 and dipole antenna 291 of embodiment 23 are used. It is possible to provide a small-sized diversity antenna for a wireless communication terminal with a low gain and a high gain. (Embodiment 29)

Embodiment 29 is an embodiment in which a diversity antenna is realized using the built-in antenna for a wireless communication terminal in Embodiments 1 and 19. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiments 1 and 19 are denoted by the same reference numerals, and detailed description is omitted. .

FIG. 35 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 29. As shown in FIG. 35, the diversity antenna according to the present embodiment has a configuration in which dipole antenna 12 shown in Embodiment 1 is further added to the configuration of the built-in antenna for a wireless communication terminal in Embodiment 19. Take. . Here, one of the antennas constituting the diversity antenna is the dipole antenna 12 in the first embodiment and is dedicated to reception. Further, the other antenna constituting the diversity antenna is used as the dipole antenna 201 in the nineteenth embodiment for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 201 operates at the time of transmission, and the dipole antenna 201 and the dipole antenna 12 operate at the time of reception to perform diversity reception. . As described above, according to the present embodiment, dipole antenna 12 in Embodiment 1 and dipole antenna 201 in Embodiment 19 are used as diversity antennas. In addition, it is possible to provide a diversity antenna for a high gain V wireless communication terminal that is less affected by the human body.

(Embodiment 30)

Embodiment 30 is an embodiment in which a diversity antenna is realized using the built-in antenna for a wireless communication terminal in Embodiments 2 and 19. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiments 2 and 19 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 36 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 30. As shown in FIG. 36, the diversity antenna according to the present embodiment has a configuration in which dipole antenna 12 shown in Embodiment 2 is further added to the configuration of the built-in antenna for a wireless communication terminal in Embodiment 19. Take. .

Here, one of the antennas constituting the diversity antenna is dedicated to reception as the dipole antenna 12 in the second embodiment. Further, the other antenna constituting the diversity antenna is used as the dipole antenna 201 in the nineteenth embodiment for both transmission and reception. In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 201 operates at the time of transmission, and the dipole antenna 201 and the dipole antenna 12 operate at the time of reception to perform diversity reception. As described above, according to the present embodiment, dipole antenna 12 in Embodiment 2 and dipole antenna 201 in Embodiment 19 are used as diversity antennas. As in Embodiment 19, it is possible to provide a small-sized diversity antenna for wireless communication terminals with high gain and little influence of the human body.

(Embodiment 3 1)

Embodiment 31 is an embodiment in which a diversity antenna is realized using the built-in antenna for a wireless communication terminal in Embodiments 3 and 19. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in Embodiments 3 and 19 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 37 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 31. As shown in FIG. 37, in the diversity antenna according to the present embodiment, the dipole antenna 41 shown in Embodiment 3 is further provided in the configuration of the built-in antenna for a wireless communication terminal in Embodiment 19. The configuration adopted is .

Here, one of the antennas constituting the diversity antenna is designated as the dipole antenna 41 in the third embodiment and is dedicated to reception. Also, the other antenna constituting the diversity antenna is the dipole antenna 201 in the nineteenth embodiment and is used for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 201 operates at the time of transmission, and the dipole antenna 201 and the dipole antenna 41 operate at the time of reception to perform diversity reception. Thus, according to the present embodiment, the diversity antenna Since the dipole antenna 41 in Embodiment 3 and the dipole antenna 201 in Embodiment 19 are used, as in Embodiment 3 and Embodiment 19, high gain and small size with little effect on the human body A diversity antenna for a wireless communication terminal can be provided.

(Embodiment 32)

Embodiment 32 is an embodiment in which a diversity antenna is realized using the antenna with a built-in wireless communication terminal in Embodiments 1 and 20. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiments 1 and 20 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 38 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 32. As shown in FIG. 38, the diversity antenna according to the present embodiment has a configuration in which dipole antenna 12 shown in Embodiment 1 is further added to the configuration of the built-in antenna for a wireless communication terminal in Embodiment 20. Take. .

Here, one of the antennas constituting the diversity antenna is dedicated to reception as the dipole antenna 12 in the first embodiment. Further, the other antenna constituting the dipersistency antenna is used as the dipole antenna 211 in the twenty-first embodiment and is used for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 211 operates at the time of transmission, and at the time of reception, the dipole antenna 211 and the dipole antenna 12 operate to perform diversity reception. As described above, according to the present embodiment, dipole antenna 12 in Embodiment 1 and dipole antenna 211 in Embodiment 20 are used as the diversity antennas. As in mode 20, it is possible to provide a small-sized diversity antenna for radio communication terminals with high gain and little influence of the human body. (Embodiment 33)

Embodiment 33 is an embodiment in which a diversity antenna is realized using the antenna with a built-in wireless communication terminal in Embodiments 3 and 20. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in Embodiments 3 and 20 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 39 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 33. As shown in FIG. 39, the diversity antenna according to the present embodiment has a configuration in which dipole antenna 41 shown in Embodiment 3 is further added to the configuration of the built-in antenna for a wireless communication terminal in Embodiment 20. Take. .

Here, one of the antennas constituting the diversity antenna is designated as the dipole antenna 41 in the third embodiment and is dedicated to reception. Further, the other antenna constituting the diversity antenna is used as the dipole antenna 211 in the twenty-first embodiment and is used for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 211 operates during transmission, and the dipole antenna 211 and the dipole antenna 41 operate during reception to perform diversity reception. Will be As described above, according to the present embodiment, as the diversity antennas, dipole antenna 41 in Embodiment 3 and dipole antenna 211 in Embodiment 20 are used. As in mode 20, it is possible to provide a small-sized diversity antenna for radio communication terminals with high gain and little influence of the human body.

(Embodiment 3 4)

Embodiment 34 is an embodiment in which a diversity antenna is realized using the antenna with a built-in wireless communication terminal in Embodiments 1 and 22. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described. This will be described with reference to FIG. Note that the same components as those in Embodiments 1 and 22 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 40 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 34. As shown in FIG. 40, in the diversity antenna according to the present embodiment, the dipole antenna 12 shown in Embodiment 1 is further provided in the configuration of the built-in antenna for a wireless communication terminal in Embodiment 22. The configuration adopted is .

Here, one of the antennas constituting the diversity antenna is designated as the dipole antenna 12 in the first embodiment and is dedicated to reception. Further, the other antenna constituting the diversity antenna is used as the dipole antenna 2 31 in Embodiment 22 for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 2 31 operates at the time of transmission, and at the time of reception, the dipole antenna 2 31 and the dipole antenna 12 operate to perform diversity reception. . As described above, according to the present embodiment, dipole antenna 12 in Embodiment 1 and dipole antenna 231 in Embodiment 22 are used as diversity antennas. As in Embodiment 22, it is possible to provide a small-sized diversity antenna for wireless communication terminals with high gain and little influence of the human body.

(Embodiment 35)

Embodiment 35 is an embodiment in which a diversity antenna is realized using the antenna with a built-in wireless communication terminal in Embodiment 2 and Embodiment 22. Hereinafter, the diversity antenna for wireless communication according to the present embodiment will be described with reference to FIG. The same components as those in Embodiment 2 and Embodiment 22 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 41 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 35. As shown in FIG. 41, the die —The Siti antenna adopts a configuration in which the dipole antenna 12 shown in the second embodiment is further provided in the configuration of the built-in antenna for a wireless communication terminal in the second embodiment.

Here, one of the antennas constituting the diversity antenna is dedicated to reception as dipole antenna 12 in the second embodiment. Further, the other antenna constituting the diversity antenna is used as the dipole antenna 2 31 in Embodiment 22 for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 2 31 operates at the time of transmission, and at the time of reception, the dipole antenna 2 31 and the dipole antenna 12 operate to achieve diversity reception. Done. As described above, according to the present embodiment, dipole antenna 12 in Embodiment 2 and dipole antenna 231 in Embodiment 22 are used as diversity antennas. As in the case of Embodiment 22, it is possible to provide a high-gain, small-sized diversity antenna for wireless communication terminals that is less affected by the human body.

(Embodiment 36)

Embodiment 36 is an embodiment in which a diversity antenna is realized using the antenna with a built-in wireless communication terminal in Embodiments 3 and 22. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in Embodiments 3 and 22 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 42 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 36. As shown in FIG. 42, the dipersistency antenna according to the present embodiment further includes the dipole antenna 41 shown in Embodiment 3 in addition to the configuration of the built-in antenna for a radio communication terminal in Embodiment 22. Take the configuration.

Here, one of the antennas constituting the diversity antenna is described in the embodiment. As the dipole antenna 41 in 3, it is for reception only. Further, the other antenna constituting the dipersistency antenna is used as the dipole antenna 231 of the embodiment 22 for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 231 operates at the time of transmission, and at the time of reception, the dipole antenna 231 and the dipole antenna 41 operate to perform diversity reception. Thus, according to the present embodiment, as the diversity antenna, dipole antenna 41 in Embodiment 3 and dipole antenna 231 in Embodiment 22 are used. As in Embodiment 22, a high-gain small-size dipole antenna for a wireless communication terminal with little influence of the human body can be provided.

(Embodiment 37)

Embodiment 37 is an embodiment in which a diversity antenna is realized using the antenna with a built-in wireless communication terminal in Embodiments 1 and 23. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in Embodiments 1 and 23 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 43 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 37. In FIG. As shown in FIG. 43, the dipersistency antenna according to the present embodiment has a configuration in which the dipole antenna 12 shown in Embodiment 1 is further provided in the configuration of the built-in antenna for a wireless communication terminal in Embodiment 23. Take.

Here, one of the antennas constituting the diversity antenna is designated as the dipole antenna 12 in the first embodiment and is dedicated to reception. Further, the other antenna constituting the diversity antenna is used as the dipole antenna 241 of the embodiment 23 for both transmission and reception.

In the wireless communication terminal diversity antenna having the above configuration, Only the dipole antenna 241 operates, and during reception, the dipole antenna 241 and the dipole antenna 12 operate to perform diversity reception. As described above, according to the present embodiment, dipole antenna 12 in Embodiment 1 and dipole antenna 241 in Embodiment 23 are used as diversity antennas. As in the case of Embodiment 23, it is possible to provide a small-sized diversity antenna for a wireless communication terminal with high gain and little influence of the human body.

(Embodiment 38)

Embodiment 38 is an embodiment in which a diversity antenna is realized using the antenna with a built-in wireless communication terminal in Embodiments 3 and 23. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. The same components as those in Embodiments 3 and 23 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 44 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 38. As shown in FIG. 44, in the diversity antenna according to the present embodiment, the dipole antenna 41 shown in Embodiment 3 is further added to the configuration of the built-in antenna for a wireless communication terminal in Embodiment 23. The configuration adopted is

Here, one of the antennas constituting the diversity antenna is designated as the dipole antenna 41 in the third embodiment and is dedicated to reception. Further, the other antenna constituting the diversity antenna is used as the dipole antenna 241 of the embodiment 23 for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 241 operates at the time of transmission, and at the time of reception, the dipole antenna 241 and the dipole antenna 41 operate to perform diversity reception. Thus, according to the present embodiment, as the diversity antennas, dipole antenna 41 in Embodiment 3 and the dipole antenna in Embodiment 23 are used. Since pole antenna 241 is used, it is possible to provide a high-gain and small-sized diversity antenna for a wireless communication terminal that is less affected by a human body, as in the third and second embodiments.

(Embodiment 39)

Embodiment 39 is an embodiment in which the configuration of the dipole antenna 41 in Embodiment 3 is changed. Embodiment 39 is the same as Embodiment 3 except for the configuration of the dipole antenna, and a detailed description thereof will be omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 3 will be described with reference to FIGS. The same parts as in Embodiment 3 are given the same reference numerals, and detailed description is omitted. FIG. 45 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 39. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 39 includes a ground plane 11, a parallel / unparallel conversion circuit 13, and a dipole antenna 401. . One of the two antenna elements constituting the dipole antenna 401 is formed in a rectangular wave shape, and the other is formed in a rod shape. The two antenna elements are arranged such that the longitudinal direction of the rectangular wave-shaped antenna element and the axial direction of the rod-shaped antenna element are substantially orthogonal. . The dipole antenna 401 is mounted such that the longitudinal direction of the rectangularly shaped antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. Also, the antenna element is mounted such that the axial direction of the rod-shaped antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal.

As described above, dipole antenna 401 is mounted such that the longitudinal direction of the antenna element formed in a rectangular wave shape is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. The rod-shaped antenna element is mounted so that the axial direction of the antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. As a result, the dipole antenna 401 receives a vertical polarization parallel to the longitudinal direction and a horizontal polarization parallel to the longitudinal direction in free space. In addition, call In the state, since the human body operates as a reflector, the dipole antenna 401 has directivity in a direction opposite to the direction of the human body.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmitting / receiving circuit is converted into a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 401. The antenna element formed into a rectangular wave shape of the dipole antenna 401 fed in this way mainly transmits vertically polarized waves parallel to the longitudinal direction. Upon reception, a vertically polarized wave parallel to the longitudinal direction is received. On the other hand, horizontal polarized waves are mainly transmitted by the rod-shaped antenna element of the dipole antenna 401 fed as described above. At the time of reception, horizontal polarization parallel to the axial direction of the rod-shaped antenna element is received. Therefore, in free space, vertical and horizontal polarized waves are received from all directions centering on the dipole antenna, and in a talking state, the human body becomes a reflector as described above. Of the vertically polarized waves, mainly vertical and horizontal polarized waves from the direction opposite to the human body are received.

The above-mentioned signal (balanced signal) received by the dipole antenna 401 is sent to the transmission / reception circuit via the balance-unbalance conversion circuit 13. Here, the current flowing through the ground plane 11 is suppressed as much as possible by the above-described balance-unbalance conversion circuit 13, so that the antenna operation by the ground plane 11 is prevented. As a result, the decrease in gain due to the influence of the human body is minimized.

As described above, according to the present embodiment, the antenna current flowing through the ground plane 11 can be suppressed as much as possible by the balance-unbalance conversion circuit 13, and this is caused by the influence of the human body of the dipole antenna 201. Gain deterioration can be suppressed. Furthermore, since one antenna element of the dipole antenna 201 is formed in a rectangular wave shape, the size of the built-in antenna for a wireless communication terminal can be reduced. Therefore, it is possible to provide a high-gain and small built-in antenna for a wireless communication terminal which is less affected by the human body. Furthermore, since vertically polarized waves are mainly received by rectangular antenna elements and horizontal polarized waves are mainly received by rod-shaped antenna elements, the polarization ratio between vertical and horizontal polarization can be changed appropriately. As a result, it is possible to receive signals with a polarization ratio according to the intended use of the antenna.

(Embodiment 40)

Embodiment 40 is an embodiment in which the configuration of dipole antenna 401 is changed from embodiment 39. Embodiment 40 is the same as embodiment 39 except for the configuration of dipole antenna 401, and therefore a detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 39 will be described with reference to FIG. The same parts as those in Embodiment 39 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 46 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 40. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 40 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, and a dipole antenna 411. . The two antenna elements constituting the dipole antenna 411 are arranged such that the longitudinal direction of the rectangular wave-shaped antenna element and the axial direction of the rod-shaped antenna element are substantially orthogonal to each other.

The dipole antenna 411 is mounted such that the longitudinal direction of the rectangularly shaped antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. In addition, the antenna element is mounted such that the axial direction of the rod-shaped antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal.

Thus, in free space, the dipole antenna 411 has horizontal polarization parallel to the longitudinal direction of the rectangular shaped antenna element and vertical polarization parallel to the axial direction of the rod-shaped antenna element. Receive the waves. In addition, during a call, the human body operates as a reflector, so the dipole antenna 40

1 has directivity in the direction opposite to the human body direction. Thus, the present embodiment also provides the same effects as those of the thirty-ninth embodiment. Furthermore, since the vertically polarized wave is mainly received by the rod-shaped antenna element and the horizontally polarized wave is mainly received by the rectangular antenna element, it is possible to appropriately change the polarization ratio between the vertically polarized wave and the horizontally polarized wave. As a result, reception can be performed at a polarization ratio according to the intended use of the antenna.

(Embodiment 4 1)

Embodiment 41 is an embodiment in which the configuration of dipole antenna 51 is changed in Embodiment 4. Embodiment 41 is the same as Embodiment 4 except for the configuration of the dipole antenna, and a detailed description thereof will be omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 4 will be described with reference to FIG. The same parts as in Embodiment 4 are given the same reference numerals, and detailed description is omitted. FIG. 47 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 41. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 41 includes a It is configured to have. The two antenna elements constituting the dipole antenna 4 21 are bent near the center, and the side having the feed end 14 of the bent antenna element is formed in a rod shape, and the side having no feed end 14 is formed as a rod. It is formed in a rectangular wave shape. The two antenna elements are arranged such that their rod-shaped portions are substantially on a straight line.

The dipole antenna 4 21 is mounted such that the longitudinal direction of the rectangularly shaped antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. Further, the antenna element is mounted such that the axial direction of the rod-shaped antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal.

Thus, in free space, the dipole antenna 421 has a vertical polarization parallel to the longitudinal direction of the rectangular-shaped antenna element and a horizontal polarization parallel to the axial direction of the rod-shaped antenna element. Receive polarization. In addition, call status At times, since the human body operates as a reflector, the dipole antenna 421 has directivity in a direction opposite to the human body direction.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmitting / receiving circuit is converted into a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 4 21. The rectangular wave-shaped portion of the antenna element constituting the dipole antenna 4 21 thus fed mainly transmits vertically polarized waves parallel to the longitudinal direction of the rectangular wave-shaped portion. . Upon reception, a vertically polarized wave parallel to the longitudinal direction is received. On the other hand, the rod-shaped portion of the antenna element constituting the dipole antenna 4 21 fed as described above mainly transmits parallel polarized waves parallel to the axial direction of this portion. At the time of reception, a horizontal polarization parallel to the axial direction of this part is received. In free space, vertical and horizontal polarized waves are received from all directions with the dipole antenna as the center.In talking, the human body acts as a reflector, as described above. Vertical and horizontal polarizations from directions are mainly received.

The above-mentioned signal (balanced signal) received by the dipole antenna 4 21 is sent to the transmission / reception circuit via the balance-unbalance conversion circuit 13. Here, the current flowing through the ground plane 11 is suppressed as much as possible by the above-described balance-unbalance conversion circuit 13, so that the antenna operation by the ground plane 11 is prevented. As a result, the decrease in gain due to the influence of the human body is minimized.

Thus, the present embodiment also provides the same effects as those of the thirty-ninth embodiment. Furthermore, the vertical polarization is received mainly at the portion of the antenna element that is shaped like a bar, and the horizontal polarization is received mainly at the rectangular portion of the antenna element. Since the polarization ratio of horizontal and horizontal polarizations can be changed as appropriate, reception can be performed at a polarization ratio according to the intended use of the antenna.

(Embodiment 4 2)

Embodiment 42 differs from Embodiment 41 in that dipole antenna 4 2 1 This is an embodiment in which the configuration is changed. The embodiment 42 is the same as the embodiment 41 except for the configuration of the dipole antenna 421, and a detailed description thereof will be omitted. Hereinafter, points of the built-in antenna for a wireless communication terminal according to the present embodiment that are different from those of Embodiment 41 will be described with reference to FIG. The same parts as those in Embodiment 41 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 48 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 42. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 42 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, a feed end 14, a dipole antenna 431, Is configured. The two antenna elements constituting the dipole antenna 431 are bent near the center, and the side having the feeding end 14 of the bent antenna element is formed in a rectangular wave shape, and has the feeding end 14. The non-use side is formed in a rod shape. The two antenna elements are arranged such that the longitudinal directions of the rectangularly shaped antenna elements are substantially linear.

The dipole antenna 431 is mounted such that the longitudinal direction of the rectangular wave-shaped portion of the antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. The antenna element is mounted such that the axial direction of the rod-shaped portion of the antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal.

Thus, in free space, the dipole antenna 431 has a vertical polarization parallel to the longitudinal direction of the rectangular shaped antenna element and a horizontal polarization parallel to the axial direction of the rod-shaped antenna element. Receive polarization. Further, in a call state, the human body operates as a reflector, so that the dipole antenna 401 has directivity in a direction opposite to the human body direction.

As described above, according to the present embodiment, the same effects as those of the embodiment 39 can be obtained. Furthermore, vertical polarization is received mainly at the rod-shaped part of the antenna element, and horizontal polarization is received mainly at the rectangular-shaped part of the antenna element. Therefore, the polarization ratio between the vertical polarization and the horizontal polarization can be changed as appropriate, so that the reception can be performed with the polarization ratio according to the intended use of the antenna.

(Embodiment 4 3)

Embodiment 43 is a modification of the configuration of the dipole antenna used in each of the above embodiments.

FIG. 49 is a schematic diagram showing a configuration of dipole antenna 441 used in Embodiment 43. As shown in this figure, the folded dipole antenna 4 41 according to the embodiment 43 has an inductance element 4 42 between the element end of the rectangular wave antenna element and the feeding end 14. It is formed.

The folded dipole antenna 441 having the above-described configuration includes the built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described later, and Embodiments 49 to 59 described later. It can be applied as a dipole antenna that constitutes a diversity antenna.

Thus, by applying the dipole antenna 441 as a dipole antenna to the configuration of each of the above embodiments, the same effects as those of the above embodiments can be obtained, and the impedance can be further stepped up. And impedance matching can be easily performed. Further, by using the dipole antenna 441 of the above configuration as the dipole antenna, a two-frequency antenna can be realized.

(Embodiment 4 4)

Embodiment 44 In Embodiment 44, the configuration of the dipole antenna used in Embodiment 12 is changed. Embodiment 44 Embodiment 4 is the same as Embodiment 12 except for the configuration of the dipole antenna.

FIG. 50 is a schematic diagram showing a configuration of folded dipole antenna 451 used in Embodiment 44. As shown in this figure, the folded dipole antenna 451 according to the embodiment 44 has two rectangular wave-shaped antenna elements arranged in parallel, and the two antenna elements arranged in parallel are mounted near the center. It is formed by connecting with the persistence element 4 51 and shorting the tip.

The folded dipole antenna 451 having the above configuration is a built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described later, and Embodiments 49 to 59 described later. Alternatively, the present invention can be applied as a dipole antenna forming a diversity antenna.

As described above, according to the present embodiment, a configuration similar to that of Embodiment 12 can be obtained. Further, by using the dipole antenna 441 having the above configuration as the dipole antenna, a two-frequency antenna can be realized. (Embodiment 4 5)

Embodiment 45 is a modification of the configuration of the dipole antenna used in each of the above embodiments. Embodiment 45 is the same as the above embodiment except for the configuration of the dipole antenna. In FIG. 51, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 51 is a schematic diagram showing a configuration of the folded dipole antenna 461 used in the embodiment 45. As shown in this figure, the folded dipole antenna 461 according to the embodiment 45 is formed by loading an inductance element 462 between the element end of the rectangular wave antenna element and the feeding end 14. You. The folded dipole antenna 461 having the above-described configuration includes the built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described later, and Embodiments 49 to 59 described later. It can be applied as a dipole antenna constituting a diversity antenna.

As described above, according to the present embodiment, the same effects as those of Embodiment 14 can be obtained. Further, by using the dipole antenna 461 having the above configuration as the dipole antenna, a two-frequency antenna can be realized. (Embodiment 4 6)

Embodiment 46 is the dipole antenna used in Embodiment 15. This is a modification of the tena configuration. Embodiment 46 is the same as Embodiment 15 except for the configuration of the dipole antenna. In FIG. 52, the same portions as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 52 is a schematic diagram showing a configuration of the folded dipole antenna 471 used in the embodiment 46. As shown in this figure, the folded dipole antenna 471 according to the embodiment 46 has two sets of the spiral antenna elements of the dipole antenna described in the above embodiment arranged in parallel, and is arranged in parallel. The two sets of antenna elements are connected with a capacitance of 472 near the center, and the tip is short-circuited.

The folded dipole antenna 471, having the above configuration, is provided with a built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described later, and Embodiments 49 to 59 described later. The present invention is applicable as a dipole antenna constituting a diversity antenna.

As described above, also in the present embodiment, a configuration similar to that in Embodiment 15 can be obtained. Further, by using the dipole antenna 471 of the above configuration as the dipole antenna, a two-frequency antenna can be realized. (Embodiment 4 7)

Embodiment 47 is a modification of the dipole antenna used in each of the above embodiments. Embodiment 47 is the same as the above embodiment except for the configuration of the dipole antenna. In FIG. 53, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 53 is a schematic diagram showing a configuration of dipole antenna 481 used in Embodiment 47. As shown in this figure, the dipole antenna 481 according to the embodiment 47 has two sets of the rectangular wave-shaped dipole antennas described in the above embodiment, which are arranged in parallel. Two sets of ante It is formed by short-circuiting the power supply terminals 14 of the element.

The folded dipole antenna 481 having the above-described configuration is a built-in antenna for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described later, and Embodiments 49 to 59 described later. Alternatively, the present invention can be applied as a dipole antenna forming a diversity antenna.

As described above, according to the present embodiment, the same effect as in Embodiment 12 can be obtained. Further, by using the dipole antenna 481 having the above configuration as the dipole antenna, a dual-frequency antenna can be realized. (Embodiment 48)

Embodiment 48 is a modification of the configuration of the dipole antenna used in Embodiment 12. Embodiment 48 is the same as Embodiment 12 except for the configuration of the dipole antenna. In FIG. 54, the same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 54 is a schematic diagram showing a configuration of dipole antenna 491 used in Embodiment 48. As shown in FIG.

91 is formed by arranging the two sets of spiral dipole-elements described in the embodiment 14 in parallel and short-circuiting the feed ends 14 of the two sets of antenna elements.

Folded dipole antenna 491 having the above configuration is provided with a built-in antenna or diver for a wireless communication terminal according to Embodiments 1 to 11, Embodiments 17 to 42 described later, and Embodiments 49 to 59 described later. It can be applied as a dipole antenna constituting one-site antenna.

As described above, according to the present embodiment, the same effects as those of Embodiment 14 can be obtained. Further, by using the dipole antenna 491 having the above-described configuration as the dipole antenna, a two-frequency antenna can be realized. The above dipole antennas 4 4 1, 4 5 1, 4 6 1, 4 7 1, 4 8 Since Embodiments 1 and 491 have a self-balancing action, Embodiments 43 to 48 may have a configuration in which the balance-unbalance conversion circuit 13 is omitted. In Embodiments 1 to 48, the case where the antenna element is formed in the shape of a rectangular wave has been described. However, the present invention is not limited to this. Depending on the shape and size, the antenna element may be formed in a rod shape.

(Embodiment 49)

Embodiment 49 is an embodiment in which the configuration of the dipole antenna used in Embodiment 1 is changed and a parasitic element is provided. Embodiment 49 is the same as Embodiment 1 except for the configurations of the dipole antenna and the parasitic element. In FIG. 55, the same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 55 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 49. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 49 includes a ground plane 11, a dipole antenna 12, a balanced-unbalanced conversion circuit 13 and a feed end 14. It is configured to have. The built-in antenna for a wireless communication terminal according to the present embodiment is built in a communication terminal device.

FIG. 56 is a front view showing the appearance of a communication terminal device having a built-in antenna for a wireless communication terminal according to the present embodiment. As shown in this figure, a speaker 511 is provided on an upper portion of the main surface of the housing 5110. Below the speaker 5 11, a display 5 12 for displaying various information such as a telephone number to be called and an operation menu is provided. At the lower end of the main surface of the housing 510, a microphone 513 for capturing a user's voice is provided. Further, built-in antenna 514 for the wireless communication terminal according to the present embodiment is mounted inside housing 5110. The wireless communication terminal built-in antenna 5 14 is installed such that the ground plane 11 is substantially parallel to the main surface.

Hereinafter, with reference to FIG. 55, the built-in antenna for the wireless communication terminal according to the present embodiment will be described. Each element of the element will be described.

The dipole antenna 501 is composed of two rod-shaped antenna elements. The two antenna elements constituting the dipole antenna 501 are arranged such that their respective axial directions are substantially straight. Further, dipole antenna 501 is mounted such that the axial direction of the antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal. Since the wireless communication terminal is considered to be used in the state shown in Fig. 58, the dipole antenna 501 is provided so that the axis direction of the antenna element is substantially perpendicular to the horizontal plane during a call. It will be. Thereby, dipole antenna 501 receives mainly vertically polarized waves parallel to the axial direction in free space. Furthermore, since the human body operates as a reflector during a call, the dipole antenna 501 has a directivity in a direction opposite to the human body direction.

The parasitic element 502 is formed in a rod shape. The parasitic element 502 is substantially parallel to the axial direction of the antenna element constituting the dipole antenna 501, and includes the antenna element constituting the dipole antenna 501 and the parasitic element 502. The plane (reference plane) to be formed is arranged so as to be substantially perpendicular to the plane formed by the ground plane 11. Since the base plate 11 is provided substantially parallel to the main surface of the housing 5 10, the reference plane is also substantially orthogonal to the main surface of the housing 5 10. FIG. 57 is a cross-sectional view of the built-in antenna for a wireless communication terminal according to the present embodiment, as viewed from the direction of arrow A in FIG. 55. As is apparent from this figure, the parasitic element 502 has a ground plane (reference plane) formed by including the antenna element constituting the dipole antenna 501 and the parasitic element 502. It is arranged so as to be substantially perpendicular to the surface formed by 1. With this arrangement, the surface formed by the antenna element and the parasitic element 502 forming the dipole antenna 501 is substantially the same as the main surface of the housing 501 shown in FIG. Orthogonal.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmitting / receiving circuit is flattened by the balanced / unbalanced conversion circuit 13. After being converted to a balanced signal, it is sent to the dipole antenna 501. The dipole antenna 501 fed in this way mainly transmits vertically polarized waves parallel to the axial direction.

The transmission wave transmitted from the dipole antenna 501 is based on the length of the dipole antenna 501, the length of the parasitic element 502, and the distance between the dipole antenna 501 and the parasitic element 502. By changing it appropriately, it has directivity in a direction along the reference plane and perpendicular to the main surface of the housing 510. The wireless communication terminal is considered to be used in a state as shown in FIG. In this case, since the main surface of the housing 5101 faces the temporal region of the user, the transmission wave is the length of the diball antenna 501, the length of the parasitic element 502, and the dipole antenna. By appropriately adjusting the distance between 501 and the parasitic element 502, the signal is transmitted in the direction opposite to the human body.

On the other hand, upon reception, a vertically polarized wave parallel to the axial direction of the antenna element is received. During a call, the direction opposite to the human body can be adjusted by appropriately adjusting the length of the dipole antenna 501, the length of the parasitic element 502, and the distance between the dipole antenna 501 and the parasitic element 502. Therefore, the vertical polarization from the opposite direction to the human body among the vertical polarization is mainly received. Further, as described above, even when the human body serves as the reflector, the vertical polarization from the direction opposite to the human body among the vertical polarization is mainly received.

The signal as described above received by the dipole antenna 501 is sent to the transmission / reception circuit via the balun 13. Here, since the current flowing through the ground plane 11 is suppressed as much as possible by the above-described balanced-unbalanced conversion circuit 13, the antenna operation by the ground plane 11 is prevented. This minimizes the decrease in gain due to the effects of the human body.

Thus, according to the present embodiment, the length of dipole antenna 501, the length of parasitic element 502, and the distance between diball antenna 501 and parasitic element 502 are By properly adjusting the dipole antenna 501 Since it has directivity in the opposite direction to the body, it is possible to suppress gain deterioration due to the influence of the human body. Further, similarly to the first embodiment, by appropriately matching the impedance in the balance-unbalance conversion circuit 13, the antenna current flowing through the ground plane 11 can be suppressed as much as possible. Can be suppressed from deteriorating.

(Embodiment 50)

Embodiment 50 is an embodiment in which the mounting method of the dipole antenna 501 and the parasitic element 502 is changed in Embodiment 49. The embodiment 50 is the same as the embodiment 49 except for a method of mounting the dipole antenna 501 and the parasitic element 502, and therefore a detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 49 will be described with reference to FIG. The same parts as those in the embodiment 49 are denoted by the same reference numerals, and the detailed description is omitted. FIG. 59 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 50. As shown in this figure, the built-in antenna for a wireless communication terminal according to the second embodiment includes a ground plane 11, a balanced-unbalanced conversion circuit 13, a feed end 14, a dipole antenna 501, And the element 502. The diball antenna 501 is mounted such that the axial direction of the antenna element is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. That is, this embodiment is different from embodiment 49 in that dipole antenna 501 is mounted so as to be substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal.

As described above, according to the present embodiment, gain deterioration due to the influence of the human body can be suppressed, and horizontal polarization parallel to the axial direction can be received during reception. By the way, the signal sent from the communication partner is a mixture of vertical polarization and horizontal polarization due to various factors such as reflection. Therefore, when the horizontal polarization is large, the reception gain can be increased because the axis of the antenna coincides with the plane of polarization. (Embodiment 5 1)

Embodiment 51 is an embodiment in which the configuration and mounting method of dipole antenna 501 and parasitic element 502 are different from embodiment 49. Embodiment 51 is the same as Embodiment 49 except for the configuration and mounting method of the dipole antenna 501 and the parasitic element 502, and thus a detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 49 will be described with reference to FIG. The same parts as those in the embodiment 49 are denoted by the same reference numerals, and the detailed description is omitted.

FIG. 60 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 51. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 51 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, a feed end 14, a dipole antenna 551, and a And a power supply element 55 2. The two antenna elements constituting the dipole antenna 551 are arranged so as to be substantially perpendicular to each other. Parasitic element 552 is bent near the center, and the bent sides are formed to be orthogonal to each other.

The diball antenna 551 is mounted such that one antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and the other antenna element is approximately parallel to the upper surface (horizontal plane) of the wireless communication terminal. . In addition, the parasitic element 552 is arranged such that one side thereof is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal and the other side is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. It is attached.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit provided in the wireless communication terminal is converted to a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 551. The antenna element arranged almost vertically on the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 551, which is fed in this way, has A vertically polarized wave parallel to the axial direction of the tener element is transmitted. On the other hand, an antenna element arranged substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 551, transmits horizontal polarization parallel to the axial direction of the antenna element.

The transmission wave transmitted from the dipole antenna 551, the length of the dipole antenna 551, the length of the parasitic element 552, and the distance between the dipole antenna 551 and the parasitic element 552 By appropriate adjustment, directivity is provided in a direction along the reference plane and perpendicular to the main surface of the housing 510. The wireless communication terminal is considered to be used in the state shown in Fig. 58. In this case, since the main surface of the housing 5100 faces the temporal region of the user, the transmission wave has the length of the dipole antenna 551, the length of the parasitic element 5102, and the dipole. By appropriately adjusting the distance between the antenna 551 and the parasitic element 552, the signal is transmitted in the direction opposite to the human body.

On the other hand, at the time of reception, an antenna element arranged substantially perpendicularly to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 551 causes a vertical polarization parallel to the axial direction of the antenna element. Is received. On the other hand, the antenna element arranged substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal constituting the dipole antenna 551 receives mainly horizontally polarized waves parallel to the axial direction of the antenna element. During a call, the length of the dipole antenna 501, the length of the parasitic element 502, and the distance between the diball antenna 501 and the parasitic element 502 should be adjusted appropriately. As a result, directivity in the direction opposite to the human body is formed, so that the electromagnetic waves from the direction opposite to the human body are mainly received among the received waves. Further, as described above, even when the human body serves as the reflector, the electromagnetic wave from the opposite direction to the human body among the received waves is mainly received.

As described above, according to the present embodiment, it is possible to suppress gain deterioration due to the influence of the human body, and to receive both vertical polarization and horizontal polarization parallel to the axial direction during reception. it can. By the way, the signal sent from the communication partner is Vertical polarization and horizontal polarization are mixed due to various factors such as reflection. Therefore, regardless of whether there is a large amount of vertical polarization or horizontal polarization, the built-in antenna for a wireless communication terminal according to the present embodiment matches the polarization plane of a signal sent from the other party, so that reception is not possible. The gain can be increased.

(Embodiment 52)

Embodiment 52 is an embodiment in which the configuration and the mounting method of dipole antenna 501 and parasitic element 502 are changed from embodiment 49. Embodiment 52 is the same as Embodiment 49 except for the configuration and mounting method of the dipole antenna 501 and the parasitic element 502, and thus a detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 49 will be described with reference to FIG. The same parts as those in the embodiment 49 are denoted by the same reference numerals, and the detailed description is omitted.

FIG. 61 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 52. As shown in this figure, the built-in antenna for a wireless communication terminal according to Embodiment 52 includes a ground plane 11, a balanced-unbalanced conversion circuit 13, a feed end 14, a dipole antenna 561, And a feed element 5 62. The two antenna elements constituting the dipole antenna 561 are both bent near the center, and are formed such that the bent sides are orthogonal to each other. Parasitic element 562 is bent at a point at a predetermined distance from one end, and is formed such that the bent sides are orthogonal to each other. The parasitic element 562 is also bent at a point at a predetermined distance from the other end, and is formed such that the bent sides are orthogonal to each other. The sides including both ends of the parasitic element 562 are formed to be parallel to each other, and the sides not including both ends are formed to be longer than the width direction of the base plate 11.

Each of the antenna elements constituting the dipole antenna 56 1 having the above configuration is arranged such that the side including the feeding end 14 is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal device. It is attached so that the side that does not include the power supply end 14 is substantially perpendicular to the upper surface (horizontal surface) of the wireless communication terminal device. The parasitic element 562 is mounted such that the side including the end is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and the side not including the end 14 is the upper surface of the wireless communication terminal. (Horizontal plane).

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission / reception circuit provided in the wireless communication terminal is converted to a balanced signal by the balanced / unbalanced conversion circuit 13 and then sent to the dipole antenna 561. Vertically polarized waves are transmitted by the antenna elements constituting the dipole antenna 561 fed in this manner, which are arranged substantially perpendicularly to the upper surface (horizontal plane) of the housing of the wireless communication terminal device. On the other hand, the horizontally polarized wave is transmitted by a portion of the antenna element constituting the dipole antenna 561 which is arranged substantially parallel to the upper surface (horizontal plane) of the housing of the wireless communication terminal.

The transmission wave transmitted from the dipole antenna 561 is the length of the dipole antenna 561, the length of the parasitic element 562, and the distance between the dipole antenna 561 and the parasitic element 552. By appropriately adjusting the distance, the light source has directivity in a direction along the reference plane and orthogonal to the main surface of the housing 510. The wireless communication terminal is considered to be used in the state shown in Fig. 58. In this case, since the main surface of the housing 5 10 faces the temporal region of the user, the transmitted wave is the length of the dipole antenna 5 61, the length of the parasitic element 5 62, and the dipole antenna. By adjusting the distance between the parasitic element 5 61 and the parasitic element 5 62 appropriately, the signal is transmitted in the direction opposite to the human body.

Here, the radiation characteristics of the built-in antenna for a wireless communication terminal having the above configuration in free space will be described with reference to FIG. FIG. 62 is a diagram illustrating actually measured values of radiation characteristics in free space of the built-in antenna for a wireless communication device according to the present embodiment. The size of the ground plane 11 is 2 7 × 11 4 mm, and the antenna elements constituting the dipole antenna 561 are placed on the top surface (horizontal plane) of the housing of the wireless communication terminal. The length of the sides arranged substantially in parallel is 33 mm, and the length of the antenna element constituting the dipole antenna 561, which is substantially perpendicular to the top surface (horizontal plane) of the housing of the wireless communication terminal device, is 1 7 mm, the distance of the dipole antenna 12 from the human body surface is 4 m. Further, in FIG. 62, the direction of 0 degrees as viewed from the origin corresponds to the direction of the human body as viewed from the dipole antenna 561 in FIG.

As is clear from Fig. 62, the length of the dipole antenna 561, the length of the parasitic element 562, and the distance between the dipole antenna 561 and the parasitic element 562 are appropriately adjusted. As a result, the built-in antenna for a wireless communication terminal according to the present embodiment has directivity in the direction opposite to the direction of the human body.

Next, the radiation characteristics of the built-in antenna for a wireless communication terminal having the above configuration during a call will be described with reference to FIG. FIG. 63 is a diagram illustrating measured values of radiation characteristics of the built-in antenna for a wireless communication apparatus according to the present embodiment during a call. The size of each component is the same as when the radiation characteristics shown in Fig. 62 were measured. In FIG. 63, the direction of 0 degrees from the origin corresponds to the direction of the human body as viewed from the dipole antenna 561 in FIG.

As is clear from Fig. 63, the length of the dipole antenna 561, the length of the parasitic element 562, and the distance between the dipole antenna 561 and the parasitic element 562 are appropriately adjusted. Due to the adjustment, the built-in antenna for the wireless communication terminal according to the present embodiment has directivity in a direction opposite to the direction of the human body. As a result, gain degradation due to the influence of the human body during transmission can be suppressed, and a higher gain can be obtained as compared with the conventional example shown in FIG. 3B.

As described above, according to the present embodiment, it is possible to suppress gain deterioration due to the influence of the human body, and to receive both vertical polarization and horizontal polarization parallel to the axial direction during reception. it can. By the way, a signal transmitted from a communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment has the polarization plane of the signal transmitted from the communication partner. Therefore, the reception gain can be increased.

Embodiments 53 to 59 are embodiments in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal according to any one of Embodiments 49 to 52.

(Embodiment 53)

Embodiment 53 is an embodiment in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal in Embodiment 49. Hereinafter, the diversity antenna for a wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiment 49 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 64 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 53. In FIG. 64, a monopole antenna 61 is further provided in the configuration of the built-in antenna for a wireless communication terminal according to Embodiment 49.

Here, one of the antennas constituting the diversity antenna is a dipole antenna 501 in Embodiment 49 and is dedicated to reception. The other antenna constituting the diversity antenna is used as a monopole antenna 61 for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 61 operates at the time of transmission, and at the time of reception, the dipole antenna 501 and the monopole antenna 61 operate to perform diversity reception. As described above, according to the present embodiment, since the dipole antenna 501 in Embodiment 49 is used as the diversity antenna, a diversity antenna for a radio communication terminal with a high gain and little influence on the human body is provided. be able to.

(Embodiment 54)

Embodiment 54 differs from Embodiment 53 in the configuration of the monopole antenna. This is a mode in the case where is changed. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiment 53 are denoted by the same reference numerals, and detailed description is omitted. FIG. 65 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 54. As shown in this figure, the diversity antenna for a wireless communication terminal according to the embodiment 54 includes a dipole antenna 501, a balanced-unbalanced conversion circuit 13, a feeding terminal 14, a monopole antenna 7 It is configured to have 1. The monopole antenna 71 is composed of an antenna element formed in a rectangular wave shape.

In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 71 operates at the time of transmission, and at the time of reception, the dipole antenna 501 and the monopole antenna 71 operate to perform diversity reception. As described above, according to the present embodiment, since the dipole antenna 501 in Embodiment 49 is used as the diversity antenna, a diversity antenna for a radio communication terminal with a high gain and little influence on the human body is provided. be able to.

(Embodiment 55)

Embodiment 55 is an embodiment in which the configuration of the monopole antenna in Embodiment 53 is changed. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiment 53 are denoted by the same reference numerals, and detailed description is omitted. FIG. 66 is a schematic diagram showing a configuration of the diversity antenna for wireless communication terminal according to Embodiment 55. As shown in this figure, the diversity antenna for a wireless communication terminal according to the embodiment 55 includes a dipole antenna 501, a balanced-unbalanced conversion circuit 13, a feed end 14 and a monopole antenna 81. It is configured to have The monopole antenna 81 is composed of a spirally formed antenna element. In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 81 operates at the time of transmission, and at the time of reception, the dipole antenna 501 and the monopole antenna 81 operate to perform diversity reception. As described above, in the present embodiment, even with the above configuration, the same effects as those of the embodiment 54 can be obtained.

(Embodiment 56)

Embodiment 56 is an embodiment in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal according to Embodiment 49. Hereinafter, the diversity antenna for a wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiment 49 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 67 is a schematic diagram showing the configuration of the diversity antenna for wireless communication terminal according to Embodiment 56. As shown in this figure, a dipole antenna 6 21 and a parasitic element 6 22 are further provided on the side surface of the ground plane 11 in the configuration of the built-in antenna for a radio communication terminal in the embodiment 49. The dipole antenna 6 21 has the same configuration as the dipole antenna 501.

Here, one of the antennas constituting the diversity antenna is described in the embodiment.

As the dipole antenna 501 in 49, it is for reception only. The other antenna constituting the diversity antenna is a dipole antenna 621, which is used for both transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 6 21 operates during transmission, and the dipole antenna operates during reception.

The 501 and the dipole antenna 6 21 operate to perform diversity reception.

As described above, according to the present embodiment, dipole antenna 501 and dipole antenna 621 of Embodiment 1 are used as the diversity antennas, so that a high-gain radio communication terminal diver having little influence on the human body is used. One 'Can be provided.

(Embodiment 57)

Embodiment 57 is an embodiment in which the mounting method of dipole antenna 62 1 and parasitic element 62 2 in Embodiment 56 is changed. Embodiment 57 is the same as embodiment 56 except for the method of attaching dipole antenna 62 1 and parasitic element 62 2, and therefore detailed description is omitted. Hereinafter, differences of the built-in antenna for a wireless communication terminal according to the present embodiment from Embodiment 56 will be described with reference to FIG. The same parts as those in Embodiment 56 are denoted by the same reference numerals, and detailed description is omitted. FIG. 68 is a schematic diagram showing a configuration of the diversity antenna for wireless communication terminal according to Embodiment 57. In FIG. As shown in this figure, dipole antenna 6 21 is mounted such that its axial direction is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. The parasitic element 62 is also mounted so that its axial direction is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. That is, the present embodiment is characterized in that the dipole antenna 62 1 is mounted so that the axial direction thereof is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal, and the axial direction of the parasitic element 62 2 is Embodiment 5 is different from Embodiment 56 in that it is mounted so as to be substantially parallel to the upper surface (horizontal surface) of the device. As a result, the dipole antenna 6 21 is provided so that the axial direction is substantially parallel to the horizontal plane during a call.

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 6 21 operates at the time of transmission, and the dipole antenna 501 and the dipole antenna 6 21 operate at the time of reception to perform diversity reception. .

As described above, the dipole antenna 501 can suppress the deterioration of the gain and can receive mainly vertically polarized waves parallel to the axial direction of the antenna element. In addition, dipole antenna 6 2 1 As well as receiving horizontal polarized waves mainly parallel to the axial direction of the antenna element. By the way, the signal transmitted from the communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the radio communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner, and thus receives the signal. The gain can be increased. '

As described above, according to the present embodiment, since the dipole antenna 501 and dipole antenna 621 of Embodiment 49 are used as the diversity antenna, a high-gain radio communication terminal less affected by the human body is used. A diversity antenna can be provided.

(Embodiment 58)

In Embodiment 58, as shown in FIG. 69, in Embodiment 56, the dipole antenna used for both transmission and reception is changed to the dipole antenna 551 shown in Embodiment 51, and no power is supplied. This is a mode in which the element is changed to the parasitic element shown in Embodiment 51 and the parasitic element shown in 52. Embodiment 58 is the same as Embodiment 56 except for the configuration and mounting method of the dipole antenna and the parasitic element. In FIG. 69, the same components as those in the embodiment 56 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 69 is a schematic diagram showing the configuration of the diversity antenna for a radio communication terminal according to Embodiment 58. As shown in this figure, in the dipole antenna 551, the axial direction of one of the antenna elements is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and the axial direction of the other antenna element is the upper surface of the wireless communication terminal. (Horizontal plane).

In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 551 operates at the time of transmission, and the dipole antenna 501 and the dipole antenna 551 operate at the time of reception, thereby achieving diversity reception. Done. As a result, the dipole antenna 551 can suppress the deterioration of the gain and can receive mainly vertically polarized waves and horizontally polarized waves parallel to the axial direction of the antenna element. Further, the dipole antenna 501 can suppress the deterioration of the gain and can receive mainly vertically polarized waves parallel to the axial direction of the antenna element. By the way, a signal transmitted from a communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner. The receiving gain can be increased.

As described above, according to the present embodiment, the dipole antenna 501 and the dipole antenna 551 shown in Embodiment 49 and 51, respectively, are used as the diversity antennas. Thus, it is possible to provide a high-gain diversity antenna for wireless communication terminals.

(Embodiment 5 9)

In Embodiment 59, as shown in FIG. 70, in Embodiment 58, dipole antenna 501 used only for reception is configured in the same manner as dipole antenna 551 shown in Embodiment 51. In this embodiment, a dipole antenna 651 is used, and the parasitic element 502 is a parasitic element 652 shown in the embodiment 51. Embodiment 59 is the same as Embodiment 59 except for the configuration and the mounting method of the dipole antenna and the parasitic element. In FIG. 17, the same parts as those in Embodiment 59 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 70 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 59. As shown in this figure, in both dipole antenna 55 1 and dipole antenna 651, the axial direction of one antenna element is substantially perpendicular to the upper surface (horizontal plane) of the wireless communication terminal, and that of the other antenna element. It is mounted so that the axial direction is almost parallel to the upper surface (horizontal surface) of the wireless communication terminal. In the diversity antenna for a wireless communication terminal having the above configuration, only the dipole antenna 551 operates at the time of transmission, and the dipole antenna 551 and the dipole antenna 651 operate at the time of reception to perform diversity reception. .

As a result, the dipole antenna 551 can suppress the deterioration of the gain and can receive mainly vertically polarized waves and horizontally polarized waves parallel to the axial direction of the antenna element. Further, the dipole antenna 651 can suppress the deterioration of the gain and can receive mainly vertically polarized waves parallel to the axial direction of the antenna element. By the way, a signal transmitted from a communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, regardless of whether the vertical polarization or the horizontal polarization is large, the built-in antenna for the wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner. The receiving gain can be increased.

Thus, according to the present embodiment, as the diversity antenna, dipole antenna 651 and dipole antenna 55 in Embodiment 51 are used.

Since 1 is used, it is possible to provide a high-gain diversity antenna for wireless communication terminals that is less affected by the human body.

In Embodiments 49 to 59 described above, a case has been described in which each antenna element of the diball antenna is formed in a rod shape. However, the present invention is not limited to this. One or both may be formed in a rectangular wave shape.

In Embodiments 49 to 59 described above, the case where the parasitic element is formed in the shape of a rod has been described. However, the present invention is not limited to this, and may be formed in a rectangular wave shape or a spiral shape. It may be.

As described above, according to the present invention, since impedance matching is appropriately performed between an antenna element and a feeding unit, it is possible to provide a high-gain built-in antenna for a wireless communication terminal which is less affected by a human body. Can be. Also, Daipo By making the antenna element of the antenna a rectangular wave, a small-sized built-in antenna for a wireless communication terminal can be provided.

In addition, by appropriately adjusting the length of the dipole antenna, the length of the parasitic element, and the distance between the dipole antenna and the parasitic element, the directivity in the direction opposite to that of the human body is obtained. Gain deterioration due to the influence can be suppressed.

In addition, by adjusting the length of the dipole antenna, the length of the parasitic element, and the distance between the diball antenna and the parasitic element appropriately, the directivity in the opposite direction to the human body was obtained. Therefore, it is possible to suppress the deterioration of the gain due to the influence of the human body.

(Embodiment 60)

FIG. 71 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 60 of the present invention. Although the elements shown in the figure are mounted in the housing of the wireless communication terminal, the overall view of the wireless communication terminal is omitted for simplicity. The built-in antenna for a wireless communication terminal according to the present embodiment includes a ground plane 11, a loop antenna 601, and a balanced-unbalanced conversion circuit 13. Note that X, Y and Z indicate respective coordinate axes. Hereinafter, each component will be described.

The ground plane 11 is a plate-like ground conductor, and is attached so as to be substantially parallel to a surface (vertical surface) of the wireless communication terminal on which an operation button (not shown), a display, a speaker, and the like are provided.

The loop antenna 6001 is arranged such that the loop surface is substantially perpendicular to the surface on which the display, the speaker and the like are provided, and that the loop surface is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. Attached to. As a result, the loop antenna 600 is provided so that the loop surface is substantially perpendicular to the human body during a call. As a result, the intensities of the virtual and actual magnetic fields on the loop surface are in phase, and the loop antenna 61 The profit will be enhanced.

The loop antenna 600 is attached so that the loop surface is substantially parallel to the upper surface (horizontal plane) of the wireless communication terminal. As a result, the loop antenna 600 is provided so that the loop surface is substantially parallel to the horizontal plane. As a result, the loop antenna 600 receives mainly horizontally polarized waves parallel to the loop surface in free space. Furthermore, since the human body operates as a reflector in a call state, the loop antenna 61 has directivity in the direction opposite to the human body direction, that is, directivity in the front direction on the paper of FIG. . Further, the loop antenna 600 is provided such that its circumference is substantially equal to or less than one wavelength of the received wave. By the way, in the case of a loop antenna, if the perimeter is set to be longer than one wavelength of the received wave, the directivity is broken due to the inversion of the phase of the current flowing through the loop antenna. Therefore, loop antenna 6001 according to the present embodiment is provided so that the circumference is substantially equal to or less than one wavelength of the received wave, so that directivity is prevented from being broken.

The balance-unbalance conversion circuit 13 is a conversion circuit having an impedance conversion ratio of 1 to 1 or n to 1 (n is an integer), and is attached to the feeding end of the loop antenna. More specifically, one terminal of the balance-unbalance conversion circuit 13 is connected to a transmitting / receiving circuit (not shown), and the other terminal is attached to the ground plane 11. Thus, since the balance-unbalance conversion circuit 13 performs impedance conversion between the loop antenna 61 and the transmission circuit, impedance matching between the two can be properly performed. Furthermore, since the unbalanced conversion circuit 13 converts the unbalanced signal of the transmission circuit into a balanced signal and supplies the balanced signal to the loop antenna 601, the current flowing through the ground plane 11 can be minimized. This prevents the ground plate 11 from acting as an antenna, so that a decrease in the gain of the loop antenna 61 due to the influence of the human body can be suppressed.

Next, the operation of the built-in antenna for a wireless communication terminal having the above configuration will be described. The unbalanced signal from the transmission circuit is converted to a balanced signal by the balanced-unbalanced conversion circuit 13 and then sent to the loop antenna 61. The loop antenna 60 1 fed in this way mainly receives horizontal polarized waves parallel to the loop plane. In free space, horizontal polarized waves are received from all directions with the loop antenna as the center. In a talking state, the human body acts as a reflector as described above. Horizontally polarized waves from the direction opposite to the human body are mainly received.

The above signal (balanced signal) received by the loop antenna 6001 is sent to the transmission circuit via the balanced-unbalanced conversion circuit 13. Here, the current flowing through the ground plane 11 is suppressed as much as possible by the above-described balanced-unbalanced conversion circuit 13, so that the antenna operation by the ground plane 11 is prevented. This minimizes the decrease in gain due to the effects of the human body.

Here, regarding the reception characteristics of the built-in antenna for a wireless communication terminal having the above configuration, FIG.

This will be described with reference to FIG. FIG. 72 is a diagram showing measured values of reception characteristics of the built-in antenna for the wireless communication apparatus according to Embodiment 60 in a call state. In addition, the size of the ground plane 11 is 120 x 36 mm, the size of the loop antenna 61 is 63 x 5 mm, the distance of the loop antenna 61 from the human body is 5 mm, and the frequency is It shall be 2 180 MHz. Also, in FIG. 72, the direction of 270 degrees as viewed from the origin corresponds to the direction of the human body as viewed from the loop antenna 601 in FIG. As is clear from FIG. 72, the loop antenna 61 has directivity in the direction opposite to the direction of the human body due to the influence of the human body acting as a reflector, and the reason described above. In addition to preventing directivity cracking, it has high gain characteristics with reduced gain degradation compared to the conventional example shown in Fig. 3B.

As described above, according to the present embodiment, the loop surface of loop antenna 601 is provided so as to be substantially perpendicular to the human body, so that the gain of loop antenna 601 can be increased. The perimeter of antenna 6 周囲 1 is approximately one wavelength or less By being provided below, the directivity of the loop antenna 601 is prevented from being broken, and the antenna current flowing to the ground plane 11 is minimized by the balance-unbalance conversion circuit 13. Therefore, it is possible to suppress the gain deterioration due to the influence of the human body of the loop antenna 601. Therefore, it is possible to provide a high-gain built-in antenna for a wireless communication terminal with less influence on the human body.

(Embodiment 6 1)

Embodiment 61 is an embodiment in which the mounting method of loop antenna 61 is changed in Embodiment 60. The embodiment 61 is the same as the embodiment 60 except for a method of attaching the loop antenna 601, and thus the detailed description is omitted. Hereinafter, differences of the antenna with a built-in wireless communication terminal according to the present embodiment from embodiment 60 will be described with reference to FIG. The same parts as those in Embodiment 60 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 73 is a schematic diagram showing a configuration of the antenna for a built-in wireless communication terminal according to Embodiment 61. The loop antenna 611 is arranged such that the loop surface is substantially perpendicular to the surface on which the operation buttons, the display, the speaker, and the like (not shown) of the wireless communication terminal are provided, and the loop surface is a side surface of the wireless communication terminal. (Vertical surface). That is, the present embodiment is different from Embodiment 60 in that the loop surface of loop antenna 611 is attached so as to be substantially parallel to the side surface (vertical surface) of the wireless communication terminal. As a result, the loop antenna 611 is provided so that the loop surface is substantially perpendicular to the human body and substantially parallel to the vertical plane during a call.

Thereby, the loop antenna 611 can suppress the deterioration of the gain for the above-described reason, and can mainly receive the vertical polarization parallel to the loop surface. By the way, the signal transmitted from the communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, vertical When there are many polarizations, the antenna for a built-in wireless communication terminal according to the present embodiment matches the polarization plane of the signal transmitted from the communication partner, so that the reception gain can be increased.

As described above, according to the present embodiment, loop antenna 6 11 1 is arranged such that the loop surface is substantially perpendicular to the human body, and the loop surface is substantially parallel to the side surface of the wireless communication terminal. It can not only suppress the gain deterioration due to the influence of the human body, but also receive mainly vertically polarized waves. Therefore, there is provided a high gain built-in antenna for a radio communication terminal which can prevent a gain deterioration due to a mismatch of a polarization plane with a signal from a communication partner and is less affected by a human body. Can be.

(Embodiment 6 2)

Embodiment 62 is an embodiment in which the mounting method of loop antenna 601 is changed in Embodiment 60. The embodiment 62 is the same as the embodiment 60 except for a method of attaching the loop antenna 601, and therefore the detailed description is omitted. Hereinafter, the differences between Embodiment 6 and Embodiment 60 in the built-in wireless communication terminal according to the present embodiment will be described with reference to FIG. The same parts as those in Embodiment 60 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 74 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 62. As shown in the drawing, the loop antenna 621, in the loop antenna 61 of the embodiment 60, has a side facing the power supply end among the four sides forming the loop surface bent at an intermediate point, In addition, each of the bent sides forms an angle of about 90 degrees with each other.

The loop antenna 62 1 having the above configuration is arranged so that it is substantially perpendicular to the surface (vertical surface) of the wireless communication terminal on which an operation button, a display, a speaker, and the like (not shown) are provided. They are installed so that they are almost parallel to the upper surface (horizontal surface) and side surface (vertical surface) of the wireless communication device. You That is, the present embodiment is different from embodiment 60 in that loop antenna 62 1 is attached so that the loop surface is substantially parallel to the top and side surfaces of the wireless communication terminal. As a result, as in Embodiment 60, the loop surface of the loop antenna 6 21 is substantially perpendicular to the human body during a call, and at the same time, the loop surface is ) And the side surface (circular face).

Thereby, the loop antenna 6 21 can suppress the deterioration of the gain for the above-described reason and can receive not only the horizontal polarization parallel to the loop surface but also the vertical polarization mainly. . By the way, as described above, a signal transmitted from a communication partner is a mixture of vertically polarized waves and horizontally polarized waves due to various factors such as reflection. Therefore, the antenna with a built-in wireless communication terminal according to the present embodiment matches the polarization plane of the signal sent from the communication partner, so that the gain can be further increased as compared with Embodiments 60 and 61. .

As described above, according to the present embodiment, the loop antenna 62 1 has a configuration in which the loop surface is substantially perpendicular to the human body, and the loop surface is in contact with the upper surface and the side surface of the wireless communication terminal. Mounted so that they are almost parallel, it not only suppresses gain deterioration due to the influence of the human body, but also receives both horizontal and vertical polarization, further increasing the gain. be able to. Therefore, it is possible to provide a high-gain built-in antenna for a wireless communication terminal with a low influence of the human body, which can more reliably prevent a gain deterioration due to a mismatch with a polarization plane of a signal from a communication partner. it can.

(Embodiment 6 3)

Embodiment 63 to Embodiment 67 are various types for changing the impedance of the loop antenna in Embodiment 60 to Embodiment 62 in order to reduce the size or increase the bandwidth of the loop antenna. It is a form to load means.

Embodiment 63 is intended to reduce the size and the bandwidth of the loop antenna. This is a mode in which a reactance element is used as one of the impedance changing means. Hereinafter, the built-in antenna for a wireless communication terminal according to Embodiment 63 will be described using FIG. 75A and FIG. 75B.

FIG. 75A is a schematic diagram showing a configuration of a first built-in antenna for a wireless communication terminal according to Embodiment 63. In FIG. 75A, a reactance element 632 is loaded at an intermediate point between sides of the loop antenna element 631 facing the power supply end.

FIG. 75B is a schematic diagram showing a configuration of the second built-in antenna for a wireless communication terminal according to Embodiment 63. In FIG. 75B, a reactance element 632 is loaded at an intermediate point between two sides of the loop antenna element 631 that is perpendicular to the feeding end.

As described above, by loading the reactance element 632 at the midpoint between the sides forming the loop surface in the loop antenna element 631, the current distribution of the loop antenna element 631 changes. The impedance at the power supply end of the antenna element 631 can be changed. Thus, even when the loop antenna element 631 is made small, the impedance characteristic similar to that of a large loop antenna can be obtained by changing the impedance by the reactance element 632. Therefore, by loading the reactance element 632, the loop antenna can be reduced in size.

Further, in the loop antenna element 631, by changing the position where the reactance element 632 is loaded, or by changing the magnitude of the reactance of the reactance element 632, the impedance, the radiation pattern, and the resonance of the feeding end are changed. Conditions can be changed. Thus, the band of the loop antenna can be widened by changing the loading condition of the reactance element 632.

Thus, according to the present embodiment, since the reactance element is loaded on the loop antenna element, the impedance characteristic of the loop antenna element is changed. Can be made. Therefore, it is possible to provide a small and broadband built-in antenna for a wireless communication terminal.

(Embodiment 6 4)

Embodiment 64 is an embodiment in which a variable capacitance element is used as one of the impedance changing means in order to reduce the size and the bandwidth of the loop antenna. Hereinafter, the built-in antenna for a wireless communication terminal according to Embodiment 64 will be described using FIG.

FIG. 76 is a schematic diagram showing a configuration of a built-in antenna for a wireless communication terminal according to the fifth embodiment. In FIG. 76, a variable capacitance element 642 is loaded on the feeding end of the loop antenna element 641.

By the way, when the loop antenna element is miniaturized and the perimeter is reduced to approximately half a wavelength or less, the reactance of the impedance of the loop antenna becomes inductive. Therefore, in the present embodiment, the loop antenna is connected to the feeding end of the loop antenna element 641, and the capacitance of the variable capacitance element 642 is changed to load the loop. It is possible to match the impedance of the antenna. That is, when the size of the loop antenna element 641 is reduced, impedance matching can be achieved for a wide range of frequencies by changing the capacitance of the variable capacitance element 642. As described above, according to the present embodiment, since the variable capacitance element 642 is loaded at the feed end of the loop antenna element 641, by changing the capacitance of the variable capacitance element 642, Flexible impedance matching becomes possible. Therefore, it is possible to provide a small and broadband built-in antenna for a wireless communication terminal.

(Embodiment 65)

Embodiment 65 is an embodiment in which a tuning element and a switching element are used as impedance changing means in order to reduce the size and the bandwidth of the loop antenna. Hereinafter, a built-in antenna for a wireless communication terminal according to Embodiment 65 Will be described with reference to FIGS.

FIG. 77 is a schematic diagram showing the configuration of the built-in antenna for a wireless communication terminal according to the sixth embodiment. In FIG. 77, at the feeding end of the loop antenna element 651, a circuit in which the tuning element 652 and the switching element 653 are connected in series is arranged so that only one or a plurality of sets are parallel to each other. Has been inserted.

In the built-in antenna for a wireless communication terminal having the above configuration, when all the switching elements 653 are opened, they can be used at the original tuning frequency of the loop antenna. When one switching element 653 is closed, the tuning element 652 connected to this switching element 653 is inserted in parallel, so that it differs from the original tuning frequency. Tune to frequency. Similarly, when a plurality of switching elements 653 are closed, the tuning elements 652 connected to these switching elements 653 are inserted in parallel, so that they are connected. Tune to a frequency corresponding to the total number of tuning elements 652.

As described above, in the built-in antenna for a wireless communication terminal having the above configuration, since the frequency band can be changed by the switching operation of each switching element 653, it is possible to perform tuning corresponding to various frequency bands. Become. As a result, even when the loop antenna is downsized, a wider band can be achieved.

As described above, according to the present embodiment, the frequency band can be switched by performing the switching operation of the plurality of switching elements inserted in loop antenna element 651, so that a small and wide-band wireless communication terminal is provided. A built-in antenna can be provided.

(Embodiment 6 6)

Embodiment 66 A form in which the shape of the loop antenna element is changed in order to reduce the size of the loop antenna. Hereinafter, a built-in antenna for a wireless communication terminal according to Embodiment 66 will be described using FIG.

FIG. 78 shows a configuration of a built-in antenna for a wireless communication terminal according to Embodiment 66. FIG. In FIG. 78, the loop antenna element 661 is formed so that a part or the whole thereof has a zigzag shape. Thus, the built-in antenna for a wireless communication terminal having the above configuration can flexibly change the frequency band, and is equivalent to a small antenna.

As described above, according to the present embodiment, since a part or the whole of the element constituting the loop antenna is formed in a zigzag shape, a small antenna can be realized.

(Embodiment 6 7)

Embodiment 67 is an embodiment in which the shape of the loop antenna element is changed in order to widen the band of the loop antenna. Hereinafter, the built-in antenna for a wireless communication terminal according to Embodiment 67 will be described with reference to FIG.

FIG. 79 is a schematic diagram showing the configuration of the built-in antenna for a wireless communication terminal according to Embodiment 67. In FIG. 79, the loop antenna element 671 is formed so that a part or the whole thereof has a plate shape. By the way, an antenna in which a linear antenna element is formed in a plate shape has a wide band since the impedance frequency change is small. Therefore, in the built-in antenna for a wireless communication terminal having the above configuration, a wider band can be achieved.

As described above, according to the present embodiment, part or all of the elements constituting the loop antenna are formed to be plate-shaped, so that a wideband antenna can be realized.

(Embodiment 68)

Embodiments 68 to 70 are embodiments in which a diversity antenna is realized by using the built-in antenna for a wireless communication terminal according to any one of Embodiments 60 to 62.

Embodiment 68 is a mode in which a diversity antenna is realized using the built-in antenna for a wireless communication terminal in Embodiment 1. FIG. Hereinafter, a diversity antenna for a wireless communication terminal according to the present embodiment will be described with reference to FIG. Will be explained. It is to be noted that the same components as those in Embodiment 60 are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 80 is a schematic diagram showing a configuration of a diversity antenna for a radio communication terminal according to Embodiment 68. In FIG. 80, a monopole antenna 681 is provided as the built-in antenna for a radio communication terminal according to Embodiment 60. Here, one of the antennas constituting the diversity antenna is described in the embodiment.

As a loop antenna 600 in 60, it is dedicated to reception. Also, the other antenna constituting the diversity antenna is connected to a monopole antenna.

Set to 1 for transmission and reception.

In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 681 operates at the time of transmission, and the loop antenna 60 0 at the time of reception.

1 and the monopole antenna 681 operate to perform diversity reception. As described above, according to the present embodiment, since loop antenna 601 in Embodiment 60 is used as a diversity antenna, a diversity antenna for a radio communication terminal with a high gain and less influence of a human body is provided. be able to.

(Embodiment 6 9) ''

Embodiment 69 is an embodiment in which a diversity antenna is realized using the built-in antenna for a wireless communication terminal in Embodiment 2 and the monopole antenna in Embodiment 68. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiments 61 and 68 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 81 is a schematic diagram showing a configuration of a diversity antenna for wireless communication terminals according to Embodiment 69. In FIG. 81, a monopole antenna 681 is provided as the built-in antenna for a wireless communication terminal according to Embodiment 61.

Here, one of the antennas constituting the diversity antenna is described in the embodiment. As the loop antenna 6 1 1 in 6 1, it is for reception only. In addition, the other antenna forming the diversity antenna is shared for transmission and reception as monopole antenna 681 in embodiment 68.

In the diversity antenna for a wireless communication terminal having the above configuration, only the monopole antenna 681 operates at the time of transmission, and the loop antenna 611 and the monopole antenna 681 operate at the time of reception to perform diversity reception. . As described above, according to the present embodiment, since loop antenna 611 in Embodiment 2 is used as the diversity antenna, the gain due to the fact that the polarization plane does not match the signal from the communication partner is used. It is possible to provide a high-gain diversity antenna for wireless communication terminals that can prevent deterioration and is less affected by the human body.

(Embodiment 70)

Embodiment 70 is an embodiment in which a diversity antenna is realized by using the built-in antenna for a radio communication terminal in Embodiment 62 and the monopole antenna in Embodiment 68. Hereinafter, the diversity antenna for wireless communication terminal according to the present embodiment will be described using FIG. Note that the same components as those in Embodiment 62 and Embodiment 68 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 82 is a schematic diagram showing a configuration of a diversity antenna for a wireless communication terminal according to Embodiment 70. In FIG. 82, a monopole antenna 681 is provided as a built-in antenna for a wireless communication terminal according to Embodiment 62. Here, one of the antennas constituting the diversity antenna is designated as a loop antenna 62 1 in the embodiment 62 and is dedicated to reception. In addition, the other antenna forming the diversity antenna is shared for transmission and reception as monopole antenna 681 in embodiment 68.

In the diversity antenna for wireless communication terminals having the above configuration, only the monopole antenna 681 operates at the time of transmission, and the loop antenna 62 at the time of reception. 1 and the monopole antenna 681 operate to perform diversity reception. As described above, according to the present embodiment, loop antenna 621 in Embodiment 62 is used as a diversity antenna, so that the gain deterioration due to the fact that the signal does not match the polarization plane of the signal from the communication partner is further reduced. It is possible to provide a high-gain built-in antenna for a wireless communication terminal that can be reliably prevented and has little effect on the human body.

In the above embodiment, the case where the ground plate, the loop antenna, and the distance and frequency of the loop antenna from the human body surface are set as described above has been described. However, the present invention is not limited to this, and can be changed as appropriate. It is something.

As described above, according to the present invention, the loop surface of the antenna element is provided so as to be substantially perpendicular to the human body, and the peripheral length of the antenna element is provided so as to be substantially equal to or less than one wavelength of the reception wave. In addition, since impedance matching is appropriately performed between the antenna element and the feeding means, a high-gain built-in radio communication terminal antenna with little influence of the human body can be provided.

This application was filed in Japanese Patent Application No. 370318/1998 filed on December 25, 1998, in Japanese Patent Application No. 368284/1999 filed on December 24, 1999, and in March 2000. It is based on Japanese Patent Application No. 2000-056476 filed on Apr. 19, 2000 and Japanese Patent Application No. 2000-118692 filed on Apr. 19, 2000. The contents of all of these applications are incorporated herein. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention is suitable for use in the field of antennas used for wireless devices and portable terminals, and particularly for the field of built-in antennas.

Claims

The scope of the claims

1. A ground conductor built into the housing of the wireless communication terminal and forming a plate-like surface; a dipole antenna having an antenna element connected to the ground conductor; and the dipole antenna and the ground conductor. A built-in antenna for a wireless communication terminal, comprising: impedance matching between balanced signals; and balanced / unbalanced conversion means for converting between a balanced signal and an unbalanced signal.

2. A diversity antenna having two built-in antennas for a wireless communication terminal, wherein the built-in antenna for a wireless communication terminal is built in a housing of the wireless communication terminal and forms a plate-like surface. A dipole antenna including a ground conductor, an antenna element connected to the ground conductor, impedance matching between the dipole antenna and the ground conductor, and conversion between a balanced signal and an unbalanced signal And equilibrium-unbalance conversion means.

3. A parasitic element formed in a rod shape is provided, and the parasitic element has an axial direction substantially parallel to an axial direction of the rod-shaped antenna element forming the dipole antenna, and the element and the dipole. A reference plane formed including an antenna element constituting an antenna is provided so as to be substantially orthogonal to the main surface of the wireless communication terminal, and is orthogonal to the main surface of the wireless communication terminal in a direction along the reference plane. 2. The built-in antenna for a wireless communication terminal according to claim 1, wherein the built-in antenna has directivity in a direction to be performed.

4. A diversity antenna, comprising: a built-in antenna for a wireless communication terminal; and a monopole antenna formed in a rod shape, wherein diversity communication is performed by the built-in antenna for a wireless communication terminal and the monopole antenna. The wireless communication terminal built-in antenna is built in a housing of the wireless communication terminal, and has a ground conductor forming a plate-like surface; a dipole antenna including an antenna element connected to the ground conductor; A balanced / unbalanced conversion means for matching impedance between an antenna and the ground conductor and converting between a balanced signal and an unbalanced signal; and a parasitic element formed in a rod shape. The parasitic element is formed in a rod shape whose axial direction constitutes a dipole antenna: A reference plane formed substantially parallel to the axial direction of the mobile phone, and including its own element and the antenna element constituting the dipole antenna, and provided substantially orthogonal to the main surface of the wireless communication terminal; Directivity is formed in a direction along a plane and orthogonal to a main plane of the wireless communication terminal.

5. A ground conductor that forms a plate-like surface, one end of which is connected to the ground conductor at the other end to the power supply means, and a loop surface that forms is substantially perpendicular to the plate-like surface of the ground conductor. An antenna element having a perimeter of substantially one wavelength or less of a received wave, impedance matching between the other end of the antenna element and the feeding means, and a balance signal. A built-in antenna for a wireless communication terminal, comprising: a balanced-to-unbalanced conversion means for performing conversion to an unbalanced signal.

6. The built-in antenna for a wireless communication terminal according to claim 1, wherein the antenna element includes impedance changing means for changing the impedance of the antenna element.

7. A grounding conductor forming a plate-like surface, a dipole antenna connected to the grounding conductor and the feeding means, and an impedance matching between the dipole antenna and the feeding means, and a balance signal. A built-in antenna for a wireless communication terminal, comprising: a balanced-unbalanced conversion unit that converts an unbalanced signal.

8. The dipole antenna is a folded dipole antenna configured by arranging two comb-shaped dipole antenna elements in parallel with each other, and loading impedance at the tips of the two antenna elements. The built-in antenna for wireless communication terminals described in Item 7.

9. A diversity antenna, comprising: a built-in antenna for a wireless communication terminal; and an antenna different from the built-in antenna for a wireless communication terminal, and performing diversity transmission and reception with the built-in antenna for a wireless communication terminal and the different antenna. The built-in antenna for a wireless communication terminal includes: a ground conductor forming a plate-shaped surface; one end connected to the ground conductor and the other end connected to a feeding unit; and a loop surface formed is a plate-shaped surface of the ground conductor. An antenna element provided so as to be substantially perpendicular to the antenna element and having a perimeter of substantially one wavelength or less of a received wave; and And a balance-unbalance conversion unit that matches impedance between the other end and the power supply unit and that converts a balanced signal into an unbalanced signal.

10. A diversity antenna, comprising: a built-in antenna for a wireless communication terminal; and an antenna different from the built-in antenna for a wireless communication terminal, and performing diversity transmission and reception with the built-in antenna for a wireless communication terminal and the different antenna. The built-in antenna for a wireless communication terminal includes: a ground conductor forming a plate-like surface; a diball antenna connected to the ground conductor and a power supply unit; and an impedance between the dipole antenna and the power supply unit. And a balanced-unbalanced conversion means for matching and converting a balanced signal and an unbalanced signal.

11. A wireless communication terminal device including a built-in antenna for a wireless communication terminal, wherein the built-in antenna for a wireless communication terminal is built in a housing of the wireless communication terminal, and forms a plate-shaped surface; A dipole antenna having an antenna element connected to the ground conductor; and a balance unbalance that matches impedance between the dipole antenna and the ground conductor and converts between a balanced signal and an unbalanced signal. And equilibrium conversion means.

1 2. A base station device including a built-in antenna for a wireless communication terminal, wherein the built-in antenna for a wireless communication terminal is built in a housing of the wireless communication terminal and forms a plate-shaped surface; A dipole antenna having an antenna element connected to the ground conductor; and a balanced unbalanced element for matching impedance between the dipole antenna and the ground conductor and for converting between a balanced signal and an unbalanced signal. And equilibrium conversion means.