JPH08250916A - Antenna - Google Patents

Abstract

PURPOSE: To manufacture an antenna by means of inexpensive thin film forming processing with high precision, stable quality and high reliability by forming the antenna with a thin film conductor onto a dielectric board. CONSTITUTION: A microstrip line 7 including a feeder line made of a thin film conductor, a couple of dipole antenna elements 6, a dipole antenna feeding slot 12, and a notch 8 whose electric length is 1/4 wavelength are provided onto a dielectric board. A signal fed to the microstrip line 7a being a feeder is electromagnetically coupled at a dipole feeder slot with the dipole antenna element, from which the signal is emitted as a radio wave. The matching is taken by adjusting a length (a) of the microstrip line 7 or by means of a matching circuit 11 having distributed constants. Since the antenna is made up of the dielectric board, excellent precision in the dimension is attained and the adjustment is easily taken by cutting off its pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication antenna.

[0002]

2. Description of the Related Art FIG. 13 is a block diagram of a conventional sleeve antenna for an indoor base unit of a cordless telephone. In the figure, 1 is a sleeve antenna, 2 is a radiating element portion having an electric length of ¼ wavelength, 3 is a copper tube, 4 is a feeding coaxial cable, and 5
Is a short-circuit portion that short-circuits the outer conductor of the coaxial cable 4 and the copper tube 3. Next, the operation will be described. The sleeve antenna has an electric length of the radiating element 2 and the copper tube 3 of 1
Since it has a / 4 wavelength, it operates almost as a dipole antenna, has good efficiency, and has stable directivity and impedance.

[0003]

Since the conventional sleeve antenna is constructed as described above, the processing of the short-circuit portion 5 for short-circuiting the feeding coaxial cable and the copper pipe portion, the radiating element portion, and the copper pipe are performed. There is a problem that a jig is required to process the part by adjusting the wavelength to ¼ wavelength, which is troublesome and the quality is not stable.

The present invention has been made in order to solve the above-mentioned problems, and has high accuracy, stable quality, high reliability, and high cost which can be produced by a thin film forming process. The purpose is to obtain a high performance antenna.

An object of the first invention is to obtain a high-performance antenna which has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

A second aspect of the present invention has an object to obtain a higher performance antenna which has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

A third object of the present invention is to obtain an antenna of higher performance which is highly accurate, stable in quality, highly reliable, and can be manufactured by an inexpensive thin film forming process.

A fourth object of the present invention is to obtain a higher performance antenna which has high accuracy, stable quality, high reliability and can be manufactured by an inexpensive thin film forming process.

A fifth object of the present invention is to obtain an antenna having higher precision, stable quality, high reliability, and higher performance that can be manufactured by an inexpensive thin film forming process.

A sixth object of the present invention is to obtain an antenna of higher precision which is highly accurate, has stable quality, has high reliability and can be manufactured by an inexpensive thin film forming process.

It is an object of the seventh invention to obtain an antenna of higher precision which is highly accurate, stable in quality, highly reliable, and which can be manufactured by an inexpensive thin film forming process.

An eighth object of the present invention is to obtain an antenna of higher accuracy, stable quality, high reliability, and higher performance that can be manufactured by an inexpensive thin film forming process.

A ninth object of the present invention is to obtain an antenna of higher precision which has high accuracy, stable quality, high reliability and can be manufactured by an inexpensive thin film forming process.

A tenth aspect of the present invention has an object to obtain an extremely high-performance antenna which has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

An eleventh aspect of the invention is to obtain an antenna of high precision which is highly accurate, stable in quality, highly reliable, and which can be manufactured by an inexpensive thin film forming process.

A twelfth aspect of the invention is to obtain a particularly thin antenna having high precision, stable quality, high reliability, and extremely high performance that can be manufactured by an inexpensive thin film forming process. With the goal.

A thirteenth aspect of the invention is to obtain a particularly thin antenna having high precision, stable quality, high reliability, and extremely high performance that can be manufactured by an inexpensive thin film forming process. The purpose is to

[0018]

An antenna according to the present invention comprises a thin film conductor on a dielectric substrate.

In the first invention, a microstrip line including a feeding line formed of a thin film conductor on a dielectric substrate, a pair of dipole antenna elements, a dipole antenna feeding slot, and an electric length 1 / And a four-wavelength notch.

In the second aspect of the invention, the dipole antenna elements are composed of two pairs with the feeding line interposed therebetween.

In the third invention, the tip of the microstrip line is open, and the length of the tip is adjusted.

In the fourth invention, the tip of the microstrip line is short-circuited immediately after passing through the dipole feed slot.

In the fifth aspect of the invention, a coplanar line is used in place of the microstrip line for the feeding line.

In the sixth aspect of the invention, a microstrip line including a feeding line formed of a thin film conductor on a dielectric substrate, a linear radiating element portion having an electrical length of ¼ wavelength, and 1
It is composed of one skirt portion and a notch having an electrical length of ¼ wavelength.

In the seventh aspect of the invention, the skirt portion is composed of two pieces with the feeding line interposed therebetween.

In the eighth invention, the linear radiating element portion having an electrical length of ¼ wavelength is a meander line.

In the ninth invention, the linear radiating element portion having an electric length of ¼ wavelength is a zigzag line.

In the tenth aspect of the invention, a parallel plate line is used instead of the microstrip line for the feeding line.

In the eleventh invention, a matching circuit based on a distributed constant is provided in the middle of the feeding portion of the dielectric substrate by a thin film conductor.

In the twelfth aspect of the invention, a collinear antenna is constructed by connecting a plurality of printed dipole antennas with an electric length of the feeding line separated by 1/2 wavelength.

In the thirteenth aspect of the present invention, the printed antenna composed of a linear radiating element portion having an electric length of ¼ wavelength, one skirt portion, and a notch having an electric length of ¼ wavelength is provided at the end. The antennas are separated from each other by an electrical length of 1/2 wavelength of the feeding line, and a pair of dipole antenna elements, a dipole antenna feeding slot, and an electrical length of 1 /
A collinear antenna was constructed by connecting a plurality of antennas each having a four-wavelength notch.

[0032]

The antenna according to the present invention has high dimensional accuracy, is inexpensive, is easy to process, and has stable quality.

In the first invention, a microstrip line including a feeding line formed of a thin film conductor on a dielectric substrate, a pair of dipole antenna elements, a dipole antenna feeding slot, and an electrical length of 1/4. A wavelength notch is provided.

In the second aspect of the invention, the dipole antenna element composed of two pairs sandwiching the feeding line serves as an antenna.

In the third aspect of the invention, the tip of the microstrip line is open, and the length of the tip is adjusted so that matching is performed.

In the fourth invention, the tip of the microstrip line is short-circuited immediately after passing through the dipole feed slot,
It is possible to reduce the loss of the power feeding unit.

In the fifth aspect of the invention, a coplanar line is used instead of the microstrip line for the feeding line,
The antenna volume can be reduced.

In the sixth invention, a microstrip line including a feeding line formed of a thin film conductor on a dielectric substrate, a linear radiating element portion having an electrical length of ¼ wavelength, and one skirt portion are provided. , A notch having an electrical length of ¼ wavelength.

According to the seventh aspect of the invention, the skirt portion is composed of two pieces with the feeding line interposed therebetween, and the symmetry of the directivity on the left and right is improved.

In the eighth aspect of the invention, the linear radiating element portion having an electric length of ¼ wavelength is a meander line, and the height is shortened and the antenna volume can be reduced.

In the ninth invention, the linear radiating element portion having an electric length of ¼ wavelength is a zigzag line, the height is shortened and the antenna volume can be reduced.

In the tenth aspect of the invention, the parallel plate line is used instead of the microstrip line for the feeding line, and the width can be reduced and the antenna volume can be reduced.

In the eleventh invention, a matching circuit based on a distributed constant is provided in the middle of the feeding portion of the dielectric substrate by a thin film conductor.

In the twelfth aspect of the invention, the collinear antenna is constructed by connecting a plurality of printed dipole antennas with the electrical length of the feeding line separated by 1/2 wavelength, and the cost can be reduced, and the precision and the thickness can be reduced. .

In the thirteenth invention, a microstrip line including a feeding line formed of a thin film conductor on a dielectric substrate, a linear radiating element portion having an electrical length of ¼ wavelength,
A printed antenna composed of one skirt and a notch with an electrical length of 1/4 wavelength is used as the end antenna, and the antennas are separated by an electrical length of 1/2 wavelength on the dielectric substrate. A microstrip line including a feeding line formed of a thin film conductor, a pair of dipole antenna elements, a dipole antenna feeding slot, and an electrical length 1 /
A collinear antenna is configured by connecting a plurality of antennas each having a notch of four wavelengths, which can be inexpensively configured, has high accuracy, can be thin, and can reduce the antenna volume.

[0046]

【Example】

Example 1. Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, 6 is a dipole antenna element,
7 is a microstrip line, 7a is a feeding microstrip line, 7b is a microstrip line with an open tip, 8 is a notch with an electrical length of 1/4 wavelength (a slot with an open edge), 9 is a printed circuit board, and 11 is A matching circuit based on a distributed constant formed only by a pattern, and 12 is a dipole antenna feeding slot. In the drawing, the front surface is a dipole antenna 6 and the back surface is a microstrip line. These are manufactured by a thin film forming process and a fine processing process.

Next, the operation will be described. The signal fed to the microstrip line 7a which is a feeder line is electromagnetically coupled in the dipole feeding slot, fed to the dipole antenna element 6 from this slot, and radiated as a radio wave by the dipole antenna element 6. Matching is 7b, and the length a of the open microstrip line is a.
Is adjusted, matching is performed by the matching circuit 11 based on the distributed constant, or both of them are used to achieve the optimum value. In order to efficiently operate the current flowing through the antenna inside the dipole antenna, it is desirable to reflect the current as much as possible at the tip of the dipole antenna to prevent the current from leaking to the peripheral portion. For that purpose, it is necessary to increase the impedance at the tip of the antenna. As a means for this, the impedance of the tip of the dipole antenna can be increased by reducing the size of the notch portion 8 to 1/4 in electrical length. FIG. 11 shows a directional characteristic diagram (Y-
An example of the experimental results for the Z plane and vertical polarization is shown. The balance of the directivity on the left and right is a little broken, but the directivity characteristic is almost similar to that of a dipole antenna.

In this embodiment, since the dielectric substrate is used, the dimensional accuracy is good, and the design can be adjusted relatively easily while cutting the pattern, and the copper foil forming each pattern is soldered. By covering with a resist, the rust etc. of the copper foil is suppressed and the quality is stable. It also excels in mass productivity. Also suitable for thin type.

Example 2. FIG. 2 is a configuration diagram of the second embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In this embodiment, the dipole antenna elements 6 are arranged on both left and right sides of the microstrip line 7. The basic operation and effect are the same as those of the first embodiment, but by disposing dipole antenna elements 6 on both the left and right sides of the microstrip line 7, the antenna directivity is stabilized and the vertical polarization characteristic of the XY plane is obtained. Is close to omnidirectional. FIG. 12 shows a directional characteristic diagram (YZ
An example of the experimental result of plane and vertical polarization is shown. It can be seen that the directivities on the left and right are more balanced than in FIG. 11, and the directivity characteristics are closer to those of a dipole antenna.

Compared with the effect equivalent to that of the first embodiment, the vertically polarized radiation pattern on the YZ plane becomes symmetrical and the characteristic is stabilized.

Example 3. FIG. 3 is a configuration diagram of a third embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 3, reference numeral 13 is a short circuit through hole. Next, the operation will be described. The operation and effect are almost the same as those of the first embodiment. However, in this embodiment, the dipole antenna element 6 is fed with power by directly connecting to the pattern corresponding to the ground plane of the upper microstrip line and the upper dipole pattern by the through hole 13. ing. In this case, matching is performed only by the matching circuit 11.

Since this embodiment does not use the electromagnetic coupling as in the first and second embodiments, there is an effect that the loss of the power feeding portion can be reduced.

Example 4. Even if the short-circuiting through-holes are provided at the same positions as those in the third embodiment, the same effects as in the third embodiment can be obtained.

In this case, the symmetry of the left and right directivities is improved.

Example 5. FIG. 4 is a configuration diagram of the fifth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 4A, 14 is a skirt portion, and 15 is a radiating element portion in which the dimension of b is a straight line having an electrical length of ¼ wavelength. Next, the operation will be described. In this embodiment, the dimension of c + d of the skirt portion 14 is the electrical length ¼ wavelength. In the modification of the third embodiment, the microstrip line directly extends a radiating element with an electric length of ¼ wavelength and plays a role of an upper dipole antenna.
In FIG. 4B, the skirt portion 14 is further attached to both sides of the microstrip line.

In FIG. 4A, since the positions of the central axes of the upper dipole antenna and the lower dipole antenna are deviated, the directivity tends to slightly incline vertically or horizontally, but the width of the tip can be narrowed. There are merits and it is effective in reducing the antenna volume. 4B has the same effect as that of FIG. 4A, and the symmetry of the left and right directivities is further improved.

Example 6. FIG. 5 is a configuration diagram of a sixth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 5, reference numeral 16 denotes a meander line, which is obtained by bending the linear radiating element 15 of the fifth embodiment into a meandering shape, which also has an electric length of ¼ wavelength. However, since it is bent, the size of e is shorter than the size of b of the fifth embodiment.

The antenna volume can be further reduced as compared with the fifth embodiment.

Example 7. FIG. 6 is a configuration diagram of a seventh embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 6, reference numeral 17 denotes a zigzag line, which is obtained by bending the linear radiating element 15 of the fifth embodiment shown in the drawing into a zigzag shape, which also has an electric length of ¼ wavelength.

Also in this case, the height is shortened as in the sixth embodiment, and the antenna volume can be reduced.

Example 8. FIG. 7 is a configuration diagram of an eighth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 7, 18 is a parallel plate line and 19 is a dielectric substrate. This embodiment corresponds to the second embodiment.
The parallel plate line is used instead of the microstrip line.

The width of this embodiment is smaller than that of the second embodiment, which is effective in reducing the antenna volume.

Example 9. FIG. 8 is a block diagram of the ninth embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In this embodiment, the printed dipole antenna element 6 of the first embodiment is coupled in two stages to form a collinear antenna. The printed dipole antenna elements 6 in the first and second stages are connected by microstrip lines 7a and 7b. Also, the matching circuit 11 based on the distributed constant formed of the thin film conductor is arranged only in the printed dipole antenna element 6 in the lowermost stage. The distance g between the feeding points of the first stage and the second stage is an electrical length of ½ wavelength. By doing so, the directivity of vertical polarization is maximized in the horizontal plane. However, if it is desired to have a tilt, g may be set to a distance corresponding to it.

As a result, the collinear antenna can also be formed on the dielectric substrate, and it is inexpensive, highly accurate, and thin.

Example 10. FIG. 9 shows a first embodiment of the present invention.
It is a block diagram of 0. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 9, 20 is a coplanar line. In this embodiment, a coplanar line 20 is used instead of the microstrip line of the fourth embodiment.

The width of this embodiment is smaller than that of the fourth embodiment, which is effective in reducing the antenna volume. Also,
Since the dielectric substrate can be configured only on one side, the cost can be reduced as compared to the case where both sides are configured.

Example 11. FIG. 10 is a configuration diagram of an eleventh embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. The upper printed dipole antenna element 6 of the ninth embodiment shown in FIG. 8 is replaced with the antenna of the fifth embodiment shown in FIG.

With this antenna, the same effect as that of the ninth embodiment can be obtained, and the antenna volume can be reduced.

As described above, according to the embodiments of the present invention, there is an effect that the cost is low, the accuracy is high, and the antenna volume can be reduced. Further, by covering the copper foil with the solder resist, rust etc. of the copper foil is suppressed and the quality is stable.

[0070]

According to the first aspect of the present invention, it is possible to obtain a high-performance antenna which has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

According to the second aspect of the present invention, it is possible to obtain a higher-performance antenna that has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

According to the third aspect of the invention, it is possible to obtain an antenna of higher precision which is highly accurate, has stable quality, has high reliability, and which can be manufactured by an inexpensive thin film forming process.

According to the fourth aspect of the invention, it is possible to obtain a higher performance antenna which has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

According to the fifth aspect of the invention, it is possible to obtain an antenna of higher accuracy, stable quality, high reliability, and higher performance that can be manufactured by an inexpensive thin film forming process.

According to the sixth aspect of the invention, it is possible to obtain an antenna of higher precision which is highly accurate, has stable quality, has high reliability, and can be manufactured by an inexpensive thin film forming process.

According to the seventh aspect of the present invention, it is possible to obtain a highly efficient antenna which has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

According to the eighth aspect of the invention, it is possible to obtain an antenna having higher precision than that which is highly accurate, stable in quality, highly reliable, and can be manufactured by an inexpensive thin film forming process.

According to the ninth aspect of the invention, it is possible to obtain an antenna of higher precision which has high accuracy, stable quality, high reliability, and which can be manufactured by an inexpensive thin film forming process.

According to the tenth invention, it is possible to obtain an extremely high-performance antenna which has high accuracy, stable quality, high reliability, and can be manufactured by an inexpensive thin film forming process.

According to the eleventh aspect of the invention, it is possible to obtain an antenna having high accuracy, stable quality, high reliability, and extremely high performance than that which can be manufactured by an inexpensive thin film forming process.

According to the twelfth aspect of the invention, a particularly thin antenna having high precision, stable quality, high reliability, and extremely high performance that can be manufactured by an inexpensive thin film forming process is provided. Obtainable.

According to the thirteenth invention, the antenna is highly precise, stable in quality, highly reliable, and extremely high-performance capable of being manufactured by an inexpensive thin film forming process, and in particular, a thinner antenna. Can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a fifth embodiment of the present invention.

FIG. 5 is a configuration diagram of a sixth embodiment of the present invention.

FIG. 6 is a configuration diagram of a seventh embodiment of the present invention.

FIG. 7 is a configuration diagram of an eighth embodiment of the present invention.

FIG. 8 is a configuration diagram of a ninth embodiment of the present invention.

FIG. 9 is a configuration diagram of a tenth embodiment of the present invention.

FIG. 10 is a configuration diagram of an eleventh embodiment of the present invention.

FIG. 11 is a directional pattern showing an experimental result in Example 1 of the present invention.

FIG. 12 is a directional characteristic diagram showing an experimental result in Example 2 of the present invention.

FIG. 13 is a configuration diagram of a conventional sleeve antenna for an indoor master unit of a cordless telephone.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 sleeve antenna, 2 radiating element part of electric length 1/4 wavelength, 3 copper tube, 4 feeding coaxial cable, 5 short-circuiting part which short-circuits the outer conductor of the coaxial cable 4 and the copper tube 3, 6
Dipole antenna, 7 microstrip line,
7a Microstrip line for feeding, 7b Microstrip line with open end, 8 Notch with electrical length 1/4 wavelength, 9 Printed circuit board, 11 Matching circuit by distributed constant, 12 Dipole antenna feeding slot, 13
Short circuit through hole, 14 skirt portion, 15b linear radiating element portion of which electric length is 1/4 wavelength, 16 meander line, 17 zigzag line, 18 parallel plate line, 19 dielectric substrate.

Claims (13)

[Claims] 1. A microstrip line including a feeding line formed of a thin film conductor on a dielectric substrate, a pair of dipole antenna elements, a dipole antenna feeding slot, and a notch having an electrical length of ¼ wavelength. A printed dipole antenna characterized by having. 2. The dipole antenna element is composed of two pairs with a feeding line interposed therebetween.
The printed dipole antenna described in. 3. The microstrip line has an open front end, and the matching can be adjusted by adjusting the length of the front end of the microstrip line. Printed dipole antenna. 4. The printed dipole antenna according to claim 1, wherein the tip of the microstrip line is short-circuited immediately after passing through the dipole feed slot. 5. The printed dipole antenna according to claim 1, wherein a coplanar line is used instead of the microstrip line for the feeding line. 6. A microstrip line including a feed line formed of a thin film conductor on a dielectric substrate, and an electric length of 1 /
A printed dipole antenna comprising a linear radiating element portion of four wavelengths, one skirt portion, and a notch having an electrical length of ¼ wavelength. 7. The printed dipole antenna according to claim 6, wherein the skirt portion is formed of two pieces with the feeding line interposed therebetween. 8. The radiating element portion having a linear electric length of ¼ wavelength is a meander line.
Alternatively, the printed antenna according to claim 7. 9. The radiating element portion having a straight line having an electric length of ¼ wavelength is a zigzag line.
Alternatively, the printed antenna according to claim 7. 10. The printed antenna according to any one of claims 1 to 4 or 6 to 9, wherein a parallel plate line is used in place of the microstrip line for the feed line. 11. The printed antenna according to claim 1, wherein a matching circuit based on a distributed constant is provided as a thin film conductor in the middle of the feeding portion of the dielectric substrate. 12. A collinear antenna is constructed by connecting a plurality of printed dipole antennas separated by an electric length of a feeding line by a wavelength of 1/2 wavelength to form a collinear antenna.
Alternatively, the printed antenna according to claim 10 or 11. 13. The printed antenna according to any one of claims 6 to 11 is used as an endmost antenna, and the antennas are separated from each other by an electric length of ½ wavelength. 4 or claim 10 or claim 1
A printed antenna comprising a collinear antenna configured by connecting a plurality of the antennas according to any one of 1 above.