JP3239030B2 - Primary radiator for parabolic antenna - Google Patents
Primary radiator for parabolic antennaInfo
- Publication number
- JP3239030B2 JP3239030B2 JP31047294A JP31047294A JP3239030B2 JP 3239030 B2 JP3239030 B2 JP 3239030B2 JP 31047294 A JP31047294 A JP 31047294A JP 31047294 A JP31047294 A JP 31047294A JP 3239030 B2 JP3239030 B2 JP 3239030B2
- Authority
- JP
- Japan
- Prior art keywords
- primary radiator
- waterproof cover
- parabolic antenna
- return loss
- radio wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Aerials With Secondary Devices (AREA)
- Waveguide Aerials (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】本発明は衛星放送受信用のパラボ
ラアンテナに関し、特にその一次放射器の構造に関す
る。The present invention relates to an parabolic antenna for receiving satellite broadcasting, Ru <br/> particularly regarding the structure of the primary radiator.
【0002】[0002]
【従来の技術】従来の技術について、図7及び図8を参
照して説明する。図7は従来例による衛星放送受信用の
パラボラアンテナの略側面図、図8は従来例によるパラ
ボラアンテナ用の一次放射器の断面図である。2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 7 is a schematic side view of a conventional parabolic antenna for receiving satellite broadcasting, and FIG. 8 is a cross-sectional view of a conventional parabolic antenna primary radiator.
【0003】パラボラアンテナによる衛星放送の受信
は、一般に、図7に示すように、約12GHZの信号1
00をアンテナ部101で受け、このアンテナ部101
で反射された信号100が一次放射器102の開口部1
03に集中される。そして、一次放射器102を通った
電波は、一次放射器102の後部に配したダウンコンバ
ータ104によって、約12GHZから約1GHZの信
号に変換される。この変換を行う目的は、信号が12G
HZのままであると、この信号を送信する途中で損失が
非常に大きくなるためである。変換された信号はケーブ
ル105を通って、一般家庭等のBSチューナ106に
送られる。[0003] In general, satellite broadcasting is received by a parabolic antenna, as shown in FIG.
00 is received by the antenna unit 101, and the antenna unit 101
The signal 100 reflected at the opening 1 of the primary radiator 102
03. Then, the radio wave that has passed through the primary radiator 102 is converted from a signal of about 12 GHZ to a signal of about 1 GHZ by a down converter 104 disposed at the rear of the primary radiator 102. The purpose of performing this conversion is when the signal is 12G
This is because if the signal remains at HZ, the loss becomes extremely large during transmission of this signal. The converted signal is sent through a cable 105 to a BS tuner 106 in a general home or the like.
【0004】図7に示すパラボラアンテナの一次放射器
102は円筒形状を有しており、図8に示すように、一
次放射器102の本体に対して、防水カバー107がネ
ジ嵌合部108においてネジ固定されている。防水カバ
ー107は、外部から一次放射器102の内部へ雨等が
入らないようにするためのものである。一次放射器本体
102と防水カバー107の間にはOリング109が介
挿されており、このOリング109がネジの嵌合によっ
てつぶされることにより防水機能がもたらされている。A primary radiator 102 of a parabolic antenna shown in FIG. 7 has a cylindrical shape. As shown in FIG. 8, a waterproof cover 107 is attached to a main body of the primary radiator 102 at a screw fitting portion 108. Screws are fixed. The waterproof cover 107 is for preventing rain or the like from entering the inside of the primary radiator 102 from the outside. An O-ring 109 is interposed between the primary radiator main body 102 and the waterproof cover 107, and the O-ring 109 is crushed by fitting a screw to provide a waterproof function.
【0005】以上のような構造において、防水カバー1
07は一般に、プラスチック等の樹脂で形成されている
ため、大きな誘電率を有しており、一次放射器102の
開口部103の開口面110との距離を調整しないと、
リターンロスに悪影響を及ぼすという問題があった。こ
こで、リターンロスとは、外部から一次放射器102に
入ってくる電波の内、どれだけの量が通過せずに入射方
向に反射されて戻ってしまうかを示したもので、dB単
位によって示される。電波が理想的にすべて通過した場
合を−∞dB,逆にすべて反射されてしまう場合を0d
Bとしている。図8に示した構造の場合、リターンロス
は約−20dBである。In the above structure, the waterproof cover 1
07 has a large dielectric constant because it is generally formed of a resin such as a plastic, and if the distance between the opening portion 103 of the primary radiator 102 and the opening surface 110 is not adjusted,
There was a problem that the return loss was adversely affected. Here, the return loss indicates how much of the radio wave entering the primary radiator 102 from the outside does not pass through and is reflected back in the incident direction and returned. Is shown. -∞dB when all radio waves pass ideally, 0d when all radio waves are reflected.
B. In the case of the structure shown in FIG. 8, the return loss is about -20 dB.
【0006】従来は、リターンロスの調整として、図8
に示すように、一次放射器本体102の開口面110よ
り防水カバー107の天面までの距離Lを、波長λの1
/2、即ち、約12mm程度とっており、開口面110
から前方にかなり突出する形状となっていた。Conventionally, as adjustment of return loss, FIG.
, The distance L from the opening surface 110 of the primary radiator body 102 to the top surface of the waterproof cover 107 is set to 1 of the wavelength λ.
/ 2, that is, about 12 mm.
From the front.
【0007】[0007]
【発明が解決しようとする課題】ところで、防水カバー
107の高さが図8の従来例のように高いと、降雪量の
多い地域にあっては、この防水カバー107の上に雪が
積もり、電波受信の妨害となる場合があった。しかし、
単純に防水カバー107の高さを低くすると、リターン
ロス特性が劣化してしまう。By the way, if the height of the waterproof cover 107 is high as in the conventional example shown in FIG. 8, in an area where the amount of snowfall is large, snow piles up on the waterproof cover 107 and the radio wave In some cases, it could interfere with reception. But,
If the height of the waterproof cover 107 is simply reduced, the return loss characteristics deteriorate.
【0008】また、防水カバー107が突出するように
形成されているために、プラスチック等の樹脂量が多く
コストアップにもつながっていた。Further, since the waterproof cover 107 is formed so as to protrude, the amount of resin such as plastic is large, which leads to an increase in cost.
【0009】そこで、本発明の目的は、一次放射器の防
水カバーの高さが低く、上記問題を解消でき、しかも高
さを低くしてもリターンロスに悪影響がないパラボラア
ンテナ用一次放射器を提供することにある。An object of the present invention has a low height of the waterproof cover of the primary radiator, can solve the above problems, moreover primary radiator for a parabolic antenna is not adversely affected the return loss even with a lower height To provide.
【0010】[0010]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、一次放射器の電波伝送用の本体の端部開
口部に防水カバーを設けたパラボラアンテナ用一次放射
器において、前記防水カバーの内壁面に誘電体からなり
前記開口部に向かうリターンロス調整用の突出部を設け
てなり、該突出部は前記防水カバーに一体的に形成され
てなることを特徴とする。To achieve the above object, the present invention provides a primary radiator for a parabolic antenna, wherein a waterproof cover is provided at an end opening of a main body for radio wave transmission of the primary radiator. The waterproof cover is provided with a protrusion for adjusting a return loss, which is formed on the inner wall surface of the waterproof cover and is directed toward the opening, and the protrusion is formed integrally with the waterproof cover.
【0011】[0011]
【0012】さらに、上記突出部を、前記開口部に向か
って空洞円筒状に形成してなることを特徴とする。Further, the projection is formed in a hollow cylindrical shape toward the opening.
【0013】また、前記突出部は、前記防水カバーの内
側で、且つ前記電波伝送用の本体の中心軸上に設けられ
てなることを特徴とする。また、本発明は、一次放射器
の電波伝送用の本体の端部開口部に防水カバーを設けた
パラボラアンテナ用一次放射器において、前記防水カバ
ーの内壁面に、誘電体からなり前記開口部に向かうリタ
ーンロス調整用の突出部を設けてなり、該突出部は、前
記防水カバーの内側で、且つ前記電波伝送用の本体の中
心軸上に設けられてなることを特徴とする。さらに、前
記突出部は、前記開口部に向かって円柱形状又は空洞円
筒状に形成されてなることを特徴とする。Further, the projection is provided inside the waterproof cover and on a center axis of the radio wave transmission main body. Also, the present invention provides a primary radiator
In the primary radiator for a parabolic antenna provided with a waterproof cover at the end opening of the main body for radio wave transmission, on the inner wall surface of the waterproof cover, a protrusion for return loss adjustment made of a dielectric material and directed toward the opening is provided. The projection is provided inside the waterproof cover and on the central axis of the radio wave transmission main body. Further, the projection is formed in a cylindrical shape or a hollow cylindrical shape toward the opening.
【0014】[0014]
【作用】本発明によるパラボラアンテナ用一次放射器で
は、以上のように、防水カバーの内壁側に誘電体からな
り前記開口部に向かうリターンロス調整用の突出部を設
けることによって、防水カバーの高さを低くしてもリタ
ーンロスに悪影響が生じない。[Action] <br/> in primary radiator for a parabolic antenna according to the present invention, as described above, by providing the protrusion for return loss adjustment towards the opening a dielectric on the inner wall of the waterproof cover Even if the height of the waterproof cover is reduced, the return loss is not adversely affected.
【0015】従って、従来通りのリターンロス特性を確
保したままで、従来防水カバーが高かったことによる問
題、即ち、1)防水カバーの上に雪が積もり、やはり電
波受信の妨害となった点、さらに、2)防水カバーが突
出するように形成されているために、プラスチック等の
樹脂量が多くコストアップにもつながっていた点を解消
でき、低コストで高信頼性のパラボラアンテナ用一次放
射器を実現できる。Therefore, a problem caused by the conventional waterproof cover being high while maintaining the same return loss characteristics as before, that is, 1) snow piled on the waterproof cover, which also interfered with radio wave reception. 2) Since the waterproof cover is formed so as to protrude, it is possible to eliminate the point that the amount of resin such as plastic is large and this has led to an increase in cost, and a low-cost and highly reliable primary radiator for a parabolic antenna is provided. realizable.
【0016】実際には、上記突出部の大きさ、形状を微
調整して、その結果のリターンロス特性を観測しながら
調整するので、この突出部は整合素子としての作用をす
る。[0016] In practice, the upper Ki突 out of size, shape and fine adjustment, since the adjustment while observing the return loss characteristics of the result, the projection acts as a matching element.
【0017】さらに、上記突出部を防水カバーと一体的
に形成するので、部品点数が低減できる上、接着工程も
省略できる。[0017] Further, Runode to form the projecting portion in the waterproof cover integrally parts on number can decrease, can be omitted also bonding process.
【0018】さらに、この一体化した誘電体の内部を円
筒状に空洞となるように形成することによって、誘電体
の位置に相当する防水カバー外部の部分に外観ひけ(へ
こみ)が生じることがない。外観ひけが生じると、この
窪みの部分が例え微小であっても、雪等が積もることに
よって電波障害が生じることが判明している。Furthermore, by forming the inside of the integrated dielectric so as to be hollow in a cylindrical shape, the appearance of the exterior of the waterproof cover corresponding to the position of the dielectric is not reduced. . It has been found that when appearance sink occurs, even if the recessed portion is minute, radio wave interference occurs due to accumulation of snow and the like.
【0019】また、本発明によるパラボラアンテナ用一
次放射器によれば、防水カバーの内壁側に誘電体からな
り前記開口部に向かうリターンロス調整用の突出部を、
一次放射器の電波伝送用本体の中心軸上に配置すること
によって、軸比の劣化がなく高信頼性を保証できる。Further, one embodiment for a parabolic antenna according to the present invention.
According to the secondary radiator, the inner wall side of the waterproof cover
Projection for return loss adjustment toward the opening ,
By arranging the primary radiator on the center axis of the radio wave transmission main body, high reliability can be guaranteed without deterioration of the axial ratio.
【0020】[0020]
【実施例】本発明の特徴は、パラボラアンテナ用の一次
放射器(以下、単に一次放射器と記す)の防水カバーの
内側に開口面に向かう誘電体を設けた点にある。これに
よって、リターンロスを損なうことなく、防水カバーの
高さを低くすることができた。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The feature of the present invention resides in that a dielectric toward an opening surface is provided inside a waterproof cover of a primary radiator (hereinafter simply referred to as a primary radiator) for a parabolic antenna. As a result, the height of the waterproof cover could be reduced without impairing the return loss.
【0021】以下、図面に従って詳細に説明する。図1
乃至図6は、本発明の一次放射器を説明するための図面
で、図1は本発明の一実施例による一次放射器の断面
図、図2は図1と比較するための一次放射器の断面図、
図3は図1及び図2の一次放射器のリターンロスを比較
する特性図、図4は本発明の他の実施例による一次放射
器の断面図、図5は本発明のさらに他の実施例による一
次放射器の断面図、図6は本発明のさらに他の実施例に
よる一次放射器の断面図である。Hereinafter, the present invention will be described in detail with reference to the drawings. FIG.
6 are drawings for explaining the primary radiator of the present invention, FIG. 1 is a sectional view of the primary radiator according to an embodiment of the present invention, and FIG. 2 is a diagram of the primary radiator for comparison with FIG. Sectional view,
3 is a characteristic diagram comparing return losses of the primary radiators of FIGS. 1 and 2, FIG. 4 is a sectional view of a primary radiator according to another embodiment of the present invention, and FIG. 5 is still another embodiment of the present invention. FIG. 6 is a cross-sectional view of a primary radiator according to another embodiment of the present invention.
【0022】なお、図8に示した従来例と同一機能部分
には同一記号を付している。The same parts as those of the conventional example shown in FIG. 8 are denoted by the same reference numerals.
【0023】図1に示すように、本実施例においては、
防水カバー107の内側に一次放射器の開口部103に
向かう円柱形状の誘電体1を設けている。この誘電体1
は、接着剤によって防水カバー107に接着固定されて
いる。As shown in FIG. 1, in this embodiment,
Inside the waterproof cover 107, a columnar dielectric 1 facing the opening 103 of the primary radiator is provided. This dielectric 1
Are bonded and fixed to the waterproof cover 107 with an adhesive.
【0024】各部の大きさは、一次放射器102の端部
開口面110の直径が30mm、誘電体1の厚みは約5
〜6mm、直径は8mmである。The size of each part is such that the diameter of the end opening face 110 of the primary radiator 102 is 30 mm, and the thickness of the dielectric 1 is about 5 mm.
66 mm, diameter 8 mm.
【0025】そして、この防水カバー107の高さは、
図8に示した従来例に比し非常に低くしている。従来で
あれば、防水カバー107の天面と開口面間の距離Lを
波長λの1/2より小さくするとリターンロスが大きく
なってしまうという問題があったが、本実施例のように
誘電体1を設けることによって、距離Lを短くしてもリ
ターンロスの改善が図れることが判明した。図1の場合
の距離Lは2〜3mmであり、図8に示す従来例の距離
L(=12mm)よりかなり高さを低くできたことがわ
かる。The height of the waterproof cover 107 is
It is much lower than the conventional example shown in FIG. In the related art, if the distance L between the top surface and the opening surface of the waterproof cover 107 is smaller than の of the wavelength λ, there is a problem that the return loss becomes large. It has been found that by providing 1, the return loss can be improved even if the distance L is shortened. The distance L in the case of FIG. 1 is 2 to 3 mm, and it can be seen that the height can be considerably reduced from the distance L (= 12 mm) of the conventional example shown in FIG.
【0026】このように、誘電体1を設けることによっ
て、距離Lを短くしても理想的なリターンロスが得られ
ることを、図2の構造との比較を行う図3を参照して説
明する。図2は防水カバー107の高さを、図1と同様
の距離Lを有し、且つ、誘電体を防水カバー107内に
設けていない一次放射器の断面図である。図3は、この
図2の構造と図1の構造によって得られるリターンロス
を比較した特性図である。The fact that the provision of the dielectric 1 can provide an ideal return loss even when the distance L is reduced will be described with reference to FIG. 3, which is a comparison with the structure of FIG. . FIG. 2 is a cross-sectional view of the primary radiator in which the height of the waterproof cover 107 has the same distance L as in FIG. 1 and the dielectric is not provided in the waterproof cover 107. FIG. 3 is a characteristic diagram comparing the return loss obtained by the structure of FIG. 2 with the structure of FIG.
【0027】図3において、実線が図1の構造によるリ
ターンロス、点線が図2の構造によるリターンロスの特
性である。図3から明らかなように、衛星放送の電波受
信帯域(11.7〜12GHZ)においては、図2の構
造のリターンロスが約−13dB、図1の構造のリター
ンロスは約−20dBであり、本実施例のように誘電体
1を設けたことによって、優れたリターンロス特性が得
られたことが判る。In FIG. 3, the solid line shows the characteristics of the return loss in the structure of FIG. 1, and the dotted line shows the characteristics of the return loss in the structure of FIG. As is clear from FIG. 3, in the radio wave reception band of satellite broadcasting (11.7 to 12 GHZ), the return loss of the structure of FIG. 2 is about −13 dB, and the return loss of the structure of FIG. 1 is about −20 dB. It can be seen that excellent return loss characteristics were obtained by providing the dielectric 1 as in this example.
【0028】ところで、図8に示した従来構造のリター
ンロスも約−20dBである。このように、図1の構造
は、上記電波受信帯域におけるリターンロス特性に関し
て、図8の従来構造の一次放射器と比較して何等遜色な
い。Incidentally, the return loss of the conventional structure shown in FIG. 8 is also about -20 dB. Thus, the structure of FIG. 1 is comparable to the conventional structure of the primary radiator of FIG. 8 in return loss characteristics in the radio wave reception band.
【0029】なお、周波数帯域によっては、図2の誘電
体1を設けていない構造の方が優れた特性となっている
ところがあるが、衛星放送の受信帯域を外れた箇所にな
っているので問題はない。実際の設計に当たっては、誘
電体1の大きさ、形状等によってリターンロスが微妙に
変化するので、受信帯域(11.7〜12GHZ)にお
いて理想的なリターンロスが得られるように誘電体の大
きさ等を調整する。In some frequency bands, the structure in which the dielectric 1 is not provided as shown in FIG. 2 has better characteristics, but there is a problem since the structure is outside the reception band of satellite broadcasting. There is no. In an actual design, since the return loss slightly changes depending on the size, shape, and the like of the dielectric 1, the size of the dielectric is set so that an ideal return loss can be obtained in the reception band (11.7 to 12GHZ). Adjust etc.
【0030】以上のように、本実施例によれば、従来と
同レベルのリターンロスを確保しつつ、防水カバーの高
さを低くできるので、従来構造の問題点、即ち、1)防
水カバーの上に雪が積もり、電波受信の妨害となる、
2)防水カバーが突出するように形成されているため
に、プラスチック等の樹脂量が多くコストアップにもつ
ながっていた、といった点を解消でき、低コストで高信
頼性の一次放射器を実現できる。As described above, according to the present embodiment, the height of the waterproof cover can be reduced while ensuring the same level of return loss as the conventional one. Snow piles on the top and interferes with radio wave reception.
2) Since the waterproof cover is formed so as to protrude, it is possible to solve the problem that a large amount of resin such as plastic leads to an increase in cost, and a low-cost and highly reliable primary radiator can be realized. .
【0031】図4は本発明の他の実施例である。図1の
実施例と異なるところは、誘電体1を防水カバー107
と一体とした点である。本実施例によれば、防水カバー
成形用の金型を一部変えることによって、図1の実施例
に比べて部品点数が1個減り、また別体の誘電体を防水
カバーに接着する工程も不要となるので、図1に比べて
製造工程の簡略化を図れる。FIG. 4 shows another embodiment of the present invention. The difference from the embodiment of FIG.
It is a point integrated with. According to this embodiment, by partially changing the mold for molding the waterproof cover, the number of parts is reduced by one as compared with the embodiment of FIG. 1, and a step of bonding a separate dielectric to the waterproof cover is also performed. Since it becomes unnecessary, the manufacturing process can be simplified as compared with FIG.
【0032】図5は図4をさらに改良した変形例であ
る。図4の場合、誘電体を設けたボス部の肉厚が他の部
分に比べて厚くなるので、樹脂成形の際に、誘電体を設
けた位置に相当する防水カバー107の外部に外観ひけ
(へこみ)が生じる場合があることがわかった。外観ひ
けが生じると、この窪みの部分が例え微小であっても、
雪等が積もることによって電波障害となることがわかっ
ている。例えば、従来の防水カバーの構造として、リタ
ーンロス特性の整合のために天面部を凹状にくぼませる
ものがあったが、これは特に積雪の多い地域において、
防水カバー上に雪が積もり電波障害を引き起こすことが
報告されている。FIG. 5 is a modified example of FIG. 4 which is further improved. In the case of FIG. 4, the thickness of the boss portion provided with the dielectric is thicker than other portions, and therefore, during resin molding, the appearance is reduced outside the waterproof cover 107 corresponding to the position where the dielectric is provided ( It has been found that dents may occur. When appearance sink occurs, even if this recessed part is minute,
It is known that the accumulation of snow and the like causes radio interference. For example, as a structure of a conventional waterproof cover, there has been a structure in which a top surface portion is concavely recessed in order to match return loss characteristics.
It has been reported that snow piles on the waterproof cover and causes radio interference.
【0033】そこで、本実施例においては、図5のよう
に、誘電体の部分を円筒状にすることによって、誘電体
を設ける部分と他の部分の肉厚をなるべく均一化して、
この外観ひけが生じないようにしている。Therefore, in the present embodiment, as shown in FIG. 5, the dielectric portion is made cylindrical so that the thickness of the portion where the dielectric is provided and the other portions are made as uniform as possible.
The appearance sink is prevented from occurring.
【0034】以上の図3乃至図5の構造によっても、図
1の構造と同様の効果が得られるのは当然である。ま
た、図1及び図3乃至図5の構造においては、誘電体の
配置は、一次放射器の中心軸上になるようにしている
が、さらに他の実施例として図6に示すような構造も考
えられる。しかし、円偏波受信の場合は、誘電体が一次
放射器102の中心軸上にないと、軸比の劣化があるた
め、図1、図3乃至図5の構造が理想的である。It is natural that the same effects as those of the structure of FIG. 1 can be obtained by the structures of FIGS. In the structures shown in FIGS. 1 and 3 to 5, the dielectric is arranged on the central axis of the primary radiator. However, as another embodiment, a structure as shown in FIG. Conceivable. However, in the case of circularly polarized wave reception, if the dielectric is not on the center axis of the primary radiator 102, the axial ratio is deteriorated. Therefore, the structures shown in FIGS. 1, 3 to 5 are ideal.
【0035】[0035]
【発明の効果】以上、詳細に説明したように、本発明に
よれば、パラボラアンテナ用の一次放射器において、従
来構造と変わらないリターンロス特性を確保しつつ、防
水カバーの高さを低くできる。このため、従来構造の問
題点、即ち、1)防水カバーの上に雪が積もり、電波受
信の妨害となる、2)防水カバーが突出するように形成
されているために、使用されるプラスチック等の樹脂量
が多くコストアップにつながっていた、といった点を解
消でき、低コストで高信頼性の一次放射器を実現でき
る。As described above in detail, according to the present invention, in the primary radiator for the parabolic antenna, the height of the waterproof cover can be reduced while ensuring the return loss characteristic which is the same as that of the conventional structure. . For this reason, the problems of the conventional structure are as follows: 1) snow accumulates on the waterproof cover, which hinders radio wave reception. 2) Since the waterproof cover is formed so as to protrude, plastic or the like used is not used. It is possible to solve the problem that a large amount of resin has led to an increase in cost, and a low-cost and highly reliable primary radiator can be realized.
【図1】本発明の一実施例によるパラボラアンテナ用一
次放射器の断面図である。FIG. 1 is a sectional view of a primary radiator for a parabolic antenna according to an embodiment of the present invention.
【図2】図1と比較するための一次放射器の断面図であ
る。FIG. 2 is a sectional view of a primary radiator for comparison with FIG.
【図3】図1と図2の構造による一次放射器のリターン
ロスを比較するための特性図である。FIG. 3 is a characteristic diagram for comparing the return loss of the primary radiator having the structure of FIGS. 1 and 2;
【図4】本発明の他の実施例による一次放射器の断面図
である。FIG. 4 is a cross-sectional view of a primary radiator according to another embodiment of the present invention.
【図5】本発明のさらに他の実施例による一次放射器の
断面図である。FIG. 5 is a sectional view of a primary radiator according to still another embodiment of the present invention.
【図6】本発明のさらに他の実施例による一次放射器の
断面図である。FIG. 6 is a cross-sectional view of a primary radiator according to another embodiment of the present invention.
【図7】一般的なパラボラアンテナの略側面図である。FIG. 7 is a schematic side view of a general parabolic antenna.
【図8】従来例による一次放射器の断面図である。FIG. 8 is a sectional view of a primary radiator according to a conventional example.
1 誘電体(突出部) 102 パラボラアンテナ用一次放射器(本体) 103 開口部 107 防水カバー 110 開口面 DESCRIPTION OF SYMBOLS 1 Dielectric (projecting part) 102 Primary radiator for parabolic antenna (main body) 103 Opening 107 Waterproof cover 110 Opening surface
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) H01Q 1/42 H01Q 13/02 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) H01Q 1/42 H01Q 13/02
Claims (5)
口部に防水カバーを設けたパラボラアンテナ用一次放射
器において、 前記防水カバーの内壁面に、誘電体からなり前記開口部
に向かうリターンロス調整用の突出部を設けてなり、 該突出部は前記防水カバーに一体的に形成されてなるこ
とを特徴とするパラボラアンテナ用一次放射器。1. A primary radiator for a parabolic antenna, wherein a waterproof cover is provided at an end opening of a main body for radio wave transmission of the primary radiator. A primary radiator for a parabolic antenna, comprising: a protrusion for adjusting a return loss, wherein the protrusion is formed integrally with the waterproof cover.
次放射器において、前記突出部は、前記開口部に向かっ
て空洞円筒状に形成されてなることを特徴とするパラボ
ラアンテナ用一次放射器。2. The primary radiator for a parabolic antenna according to claim 1, wherein the protrusion is formed in a hollow cylindrical shape toward the opening.
ナ用一次放射器において、前記突出部は前記防水カバー
の内側で、且つ前記電波伝送用の本体の中心軸上に設け
られてなることを特徴とするパラボラアンテナ用一次放
射器。3. The primary radiator for a parabolic antenna according to claim 1, wherein the projecting portion is provided inside the waterproof cover and on a central axis of the radio wave transmitting main body. Primary radiator for parabolic antennas.
口部に防水カバーを設けたパラボラアンテナ用一次放射
器において、 前記防水カバーの内壁面に、誘電体からなり前記開口部
に向かうリターンロス調整用の突出部を設けてなり、 該突出部は前記防水カバーの内側で、且つ前記電波伝送
用の本体の中心軸上に設けられてなることを特徴とする
パラボラアンテナ用一次放射器。4. A primary radiator for a parabolic antenna, wherein a waterproof cover is provided at an end opening of a main body for radio wave transmission of the primary radiator, wherein the inner wall surface of the waterproof cover is made of a dielectric material and is directed toward the opening. A primary radiator for a parabolic antenna, wherein a projection for adjusting return loss is provided, and the projection is provided inside the waterproof cover and on a central axis of the radio wave transmission main body. .
次放射器において、前記突出部は、前記開口部に向かっ
て円柱形状又は空洞円筒状に形成されてなることを特徴
とするパラボラアンテナ用一次放射器。5. The primary radiator for a parabolic antenna according to claim 4, wherein the protrusion is formed in a cylindrical shape or a hollow cylindrical shape toward the opening. Radiator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31047294A JP3239030B2 (en) | 1994-12-14 | 1994-12-14 | Primary radiator for parabolic antenna |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31047294A JP3239030B2 (en) | 1994-12-14 | 1994-12-14 | Primary radiator for parabolic antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08167810A JPH08167810A (en) | 1996-06-25 |
JP3239030B2 true JP3239030B2 (en) | 2001-12-17 |
Family
ID=18005661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP31047294A Expired - Fee Related JP3239030B2 (en) | 1994-12-14 | 1994-12-14 | Primary radiator for parabolic antenna |
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JP3857178B2 (en) * | 2002-04-30 | 2006-12-13 | シャープ株式会社 | Primary radiator for parabolic antenna |
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JP4510868B2 (en) * | 2007-11-09 | 2010-07-28 | シャープ株式会社 | Parabolic antenna primary radiator, low noise block down converter and satellite receiving antenna device |
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1994
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Non-Patent Citations (1)
Title |
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アンテナ工学ハンドブック(オーム社,1980年)の161−162頁(図2.25(b)) |
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