JPH07263948A - Planar antenna - Google Patents
Planar antennaInfo
- Publication number
- JPH07263948A JPH07263948A JP5611794A JP5611794A JPH07263948A JP H07263948 A JPH07263948 A JP H07263948A JP 5611794 A JP5611794 A JP 5611794A JP 5611794 A JP5611794 A JP 5611794A JP H07263948 A JPH07263948 A JP H07263948A
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- JP
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- Prior art keywords
- approximately
- planar antenna
- diameter
- circuit board
- radiating element
- 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.)
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- Waveguide Aerials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、マイクロ波帯などの衛
星通信用に用いられる平面アンテナに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plane antenna used for satellite communication such as microwave band.
【０００２】[0002]
【従来の技術】平面アンテナとしては、地導体板と給電
回路板と放射回路板とを備えるトリプレート方式のもの
が広く用いられている。これらの平面アンテナにあって
は、サイドローブを低く抑えるために主給電線に対して
給電プローブは４５°傾けられており、該給電プローブ
の上には円形スロット放射素子あるいは環状スロット放
射素子が重ねられている。2. Description of the Related Art As a planar antenna, a triplate type antenna having a ground conductor plate, a feeding circuit plate and a radiation circuit plate is widely used. In these planar antennas, the feed probe is inclined by 45 ° with respect to the main feed line in order to keep the side lobe low, and a circular slot radiating element or an annular slot radiating element is superposed on the feed probe. Has been.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
平面アンテナは放送衛星などの比較的大パワーの衛星や
その他のマイクロ波機器に対しては対応可能ではある
が、通信衛星などの比較的小パワーの衛星の利用のため
には、そのアンテナ効率は低く、充分な性能が得られな
いと言う問題点があった。However, although the conventional planar antenna can be applied to satellites having relatively high power such as broadcasting satellites and other microwave equipment, it has relatively low power such as communication satellites. However, there is a problem that the antenna efficiency is low and sufficient performance cannot be obtained for the use of the satellite.
【０００４】本発明は、上記の問題点を解決するために
成されたもので、その目的とするところは、アンテナ効
率の高い直線偏波用の平面アンテナを提供することにあ
る。The present invention has been made to solve the above problems, and an object of the present invention is to provide a planar antenna for linearly polarized waves having high antenna efficiency.
【０００５】[0005]
【課題を解決するための手段】本発明は上記の問題点を
解決するために、請求項１記載の発明にあっては、地導
体板と、給電回路を設けた給電回路板と、放射素子を設
けた放射回路板とを備える平面アンテナにおいて、前記
放射素子は、直径略λ／４と直径略３λ／４との同心円
上で、直径略λ／４の円弧に沿う線長が略０．７λであ
る第１円弧と、直径略３λ／４の円弧に沿う線長が略
２．２λである第２円弧と、前記第１円弧と前記第２円
弧とのそれぞれの端部を略０．３λの長さの線分で結ん
だ外周形状である略Ｕ字状形のスロットを対向配置した
スロット対を導電性平板に設けて形成したものであり、
前記給電回路板は、前記放射素子に対応して給電回路を
配置したものであることを特徴とする。In order to solve the above-mentioned problems, the present invention provides a ground conductor plate, a feeder circuit board provided with a feeder circuit, and a radiation element. In a planar antenna including a radiating circuit board provided with a radiating circuit board, the radiating element has a line length along a circular arc of approximately λ / 4 on a concentric circle having a diameter of approximately λ / 4 and a diameter of approximately 3λ / 4. The first circular arc of 7λ, the second circular arc having a line length of approximately 2.2λ along the circular arc of approximately 3λ / 4, and the respective end portions of the first circular arc and the second circular arc are approximately 0. It is formed by providing a conductive flat plate with a slot pair in which substantially U-shaped slots having an outer peripheral shape connected by a line segment having a length of 3λ are arranged to face each other,
The feeder circuit board is characterized in that a feeder circuit is arranged corresponding to the radiating element.
【０００６】請求項２記載の発明にあっては、前記放射
回路板は金属板に前記スロット対を打ち抜いて前記放射
素子を形成したものであることを特徴とする。According to a second aspect of the present invention, the radiation circuit board is formed by punching the slot pair into a metal plate to form the radiation element.
【０００７】請求項３記載の発明にあっては、前記放射
回路板はプリント基板に前記スロット対を設けて前記放
射素子を形成したものであることを特徴とする。According to a third aspect of the invention, the radiation circuit board is characterized in that the radiation element is formed by providing the slot pair on a printed circuit board.
【０００８】[0008]
【作用】以上のように構成したことにより、請求項１記
載の発明にあっては、直径略λ／４と直径略３λ／４と
の同心円上で、直径略λ／４の円弧に沿う線長が略０．
７λである第１円弧と、直径略３λ／４の円弧に沿う線
長が略２．２λである第２円弧と、前記第１円弧と前記
第２円弧とのそれぞれの端部を略０．３λの長さの線分
で結んだ外周形状である略Ｕ字状形のスロットを対向配
置したスロット対と、該スロット対にて形成される放射
素子との両方を介して、放射を行うようにしている。With the above construction, in the invention according to claim 1, a line extending along an arc of a diameter of approximately λ / 4 on a concentric circle having a diameter of approximately λ / 4 and a diameter of approximately 3λ / 4. The length is almost 0.
The first circular arc of 7λ, the second circular arc having a line length of approximately 2.2λ along the circular arc of approximately 3λ / 4, and the respective end portions of the first circular arc and the second circular arc are approximately 0. Radiation is performed through both a slot pair in which substantially U-shaped slots having an outer peripheral shape connected by a line segment having a length of 3λ are arranged to face each other and a radiating element formed by the slot pair. I have to.
【０００９】また、請求項２記載の発明にあっては、金
属板に打ち抜き加工を以て前記スロット対を形成すると
共に放射素子を形成できるので、放射回路板を容易に製
造できる。According to the second aspect of the present invention, since the slot pair and the radiating element can be formed by punching a metal plate, the radiating circuit board can be easily manufactured.
【００１０】更に、請求項３記載の発明にあっては、プ
リント基板自体を絶縁層とすることができると共に放射
回路板を薄い金属箔とすることができる。Further, according to the invention of claim 3, the printed circuit board itself can be an insulating layer and the radiation circuit board can be a thin metal foil.
【００１１】[0011]
【実施例】以下、本発明に係る平面アンテナの一実施例
を図１〜図４に基づいて詳細に説明する。図１は本発明
に係る平面アンテナの要部を示す分解斜視図、図２は本
発明に係る平面アンテナの放射素子を示す平面図であ
る。図３は波長に対する放射素子の寸法比をパラメータ
としたアンテナ効率の変化を示すグラフであり、図３
（ａ）は円形の穴を介して放射する従来のアンテナ効率
の変化を示し、図３（ｂ）は本発明に係るアンテナ効率
の変化を示している。図４は、円形の穴を介して放射す
る従来の平面アンテナのアンテナ効率と、本発明に係る
平面アンテナのアンテナ効率とを比較して示した帯域特
性図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a planar antenna according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is an exploded perspective view showing a main part of a planar antenna according to the present invention, and FIG. 2 is a plan view showing a radiating element of the planar antenna according to the present invention. FIG. 3 is a graph showing changes in the antenna efficiency with the dimensional ratio of the radiating element to the wavelength as a parameter.
(A) shows the change of the conventional antenna efficiency which radiates through a circular hole, and FIG.3 (b) has shown the change of the antenna efficiency which concerns on this invention. FIG. 4 is a band characteristic diagram showing a comparison between the antenna efficiency of the conventional planar antenna that radiates through a circular hole and the antenna efficiency of the planar antenna according to the present invention.
【００１２】図１に示すように、平面アンテナは、下か
ら順に、地導体板１と給電回路板２と放射回路板３とを
積層して構成している。地導体板１と給電回路板２との
間、および、給電回路板２と放射回路板３との間には、
それぞれ空気層あるいは誘電体層などの絶縁層（図示せ
ず）が設けられている。As shown in FIG. 1, the planar antenna is constructed by laminating a ground conductor plate 1, a feeding circuit plate 2 and a radiation circuit plate 3 in this order from the bottom. Between the ground conductor plate 1 and the feeding circuit plate 2, and between the feeding circuit plate 2 and the radiation circuit plate 3,
An insulating layer (not shown) such as an air layer or a dielectric layer is provided for each.
【００１３】地導体板１は、例えば市販のアルミニウム
板のような１枚の導電性金属板で構成している。給電回
路板２は、プリント基板に相当するポリエステル基板に
銅箔を積層したフレキシブル基板にエッチング加工を施
して形成した、給電回路２０を備えている。給電回路２
０は、放射素子３１に電磁結合する給電プローブ２ａ
と、該給電プローブ２ａに電磁エネルギーを供給する給
電線２ｂとから構成されている。また、給電プローブ２
ａは、放射回路板３のスロット３ａ，３ａにて挟まれて
形成される（スロット対３０にて形成される）放射素子
３１の直下に位置している。The ground conductor plate 1 is composed of a single conductive metal plate such as a commercially available aluminum plate. The power supply circuit board 2 includes a power supply circuit 20 formed by etching a flexible board in which a copper foil is laminated on a polyester board corresponding to a printed board. Feeding circuit 2
0 is a feeding probe 2a that is electromagnetically coupled to the radiating element 31.
And a power supply line 2b for supplying electromagnetic energy to the power supply probe 2a. In addition, the power supply probe 2
The letter a is located immediately below the radiating element 31 formed by the slots 3a and 3a of the radiating circuit board 3 (formed by the slot pair 30).
【００１４】放射回路板３は、導電性金属板に、スロッ
ト対３０を２０行２０列のマトリックス状に並べて合計
４００個を打ち抜き加工したもので、導電性金属板とし
は、例えば厚さ０．５mmのアルミニウム板などが用いら
れる。また、スロット対３０は、略Ｕ字状形の２つのス
ロット３ａ，３ａの開放側をそれぞれ対向して配設した
ような形のスロット対であり、詳しくは次のように構成
されている。The radiation circuit board 3 is a conductive metal plate in which slot pairs 30 are arranged in a matrix of 20 rows and 20 columns and a total of 400 pieces are punched, and the conductive metal plate has, for example, a thickness of 0. A 5 mm aluminum plate or the like is used. Further, the slot pair 30 is a slot pair having a shape in which the open sides of two substantially U-shaped slots 3a, 3a are arranged so as to face each other, and more specifically, they are configured as follows.
【００１５】すなわち、スロット対３０は、平面視で図
２に示すように、直径φ1 略λ／４（略５mm）と直径φ
2 略３λ／４（略１７mm）との同心円上で、直径φ1 略
λ／４の円弧に沿う線長が略０．７λである第１円弧Ｓ
1 と、直径φ2 略３λ／４の円弧に沿う線長が略２．２
λである第２円弧Ｓ2 と、前記第１円弧Ｓ1 と前記第２
円弧Ｓ2 とのそれぞれの端部を長さ略０．３λの２本の
線分Ｓ3,Ｓ3 で結んだ外周形状である略Ｕ字状形のスロ
ット３ａを、開放側をそれぞれ対向して配置した形状の
ものである。なお、λは設計周波数の波長である。That is, as shown in FIG. 2, the slot pair 30 has a diameter φ 1 of approximately λ / 4 (approximately 5 mm) and a diameter of φ, as shown in FIG.
2 On a concentric circle with approximately 3λ / 4 (approximately 17 mm), the first arc S having a line length of approximately 0.7λ along an arc of diameter φ 1 approximately λ / 4
1 and the line length along an arc of diameter φ 2 approximately 3λ / 4 is approximately 2.2.
the second circular arc S 2 , which is λ, the first circular arc S 1, and the second circular arc S 1 .
Each end length substantially 0.3Ramuda 2 line segments S 3, S substantially U-shaped form of the slot 3a is a peripheral shape that connects with the third arc S 2, the open side facing the respective It has a shape arranged. Note that λ is the wavelength of the design frequency.
【００１６】ところで、図３（ａ）は、放射素子として
直径φの円形の穴を用いた従来の平面アンテナにおい
て、直径φを変化させてアンテナ効率を測定した場合の
グラフを示しており、横軸はφ／λをパラメータとして
いる。また、図３（ｂ）は、図２に示すスロット対３０
と該スロット対３０にて形成される放射素子３１とを用
いた平面アンテナにおいて、図２に示す直径φ2 を略３
λ／４（略１７mm）に固定しておき直径φ1 を変化させ
て測定したアンテナ効率のグラフを示しており、横軸は
φ1 ／λをパラメータとしている。By the way, FIG. 3A shows a graph when the antenna efficiency is measured by changing the diameter φ in a conventional planar antenna using a circular hole having a diameter φ as a radiating element. The axis has φ / λ as a parameter. Further, FIG. 3B shows a slot pair 30 shown in FIG.
In a planar antenna using the radiating element 31 formed by the slot pair 30 and the diameter φ 2 shown in FIG.
It shows a graph of antenna efficiency measured by changing the diameter φ 1 while fixing it at λ / 4 (approximately 17 mm), and the horizontal axis has φ 1 / λ as a parameter.
【００１７】すなわち、図３（ａ）からは、放射素子と
して円形の穴を用いた従来の平面アンテナのアンテナ効
率を向上するには、放射素子の直径φを略３λ／４（略
１７mm）にすることが好ましいことが確認できる。そこ
で、図２に示すスロット対３０と該スロット対３０にて
形成される放射素子３１とを用いた平面アンテナにおい
て、図２に示す直径φ2 を図３（ａ）のグラフの結果と
して求まった略３λ／４（略１７mm）に固定しておき直
径φ1 を変化させて行くと、アンテナ効率は直径φ1 が
略λ／４（略５mm）のとき最高になることが確認でき
た。That is, from FIG. 3A, in order to improve the antenna efficiency of the conventional planar antenna using the circular hole as the radiating element, the diameter φ of the radiating element is set to about 3λ / 4 (about 17 mm). It can be confirmed that it is preferable to do this. Therefore, in the planar antenna using the slot pair 30 shown in FIG. 2 and the radiating element 31 formed by the slot pair 30, the diameter φ 2 shown in FIG. 2 is obtained as a result of the graph of FIG. It was confirmed that when the diameter φ 1 was changed while being fixed to about 3λ / 4 (about 17 mm), the antenna efficiency was highest when the diameter φ 1 was about λ / 4 (about 5 mm).
【００１８】図４にあっては、ηa は、円形の穴を介し
て放射する従来の平面アンテナで最大効率の得られる直
径略３λ／４（略１７mm）の円形の穴を設けた平面アン
テナのアンテナ効率を示し、ηb は、図２に示すスロッ
ト対３０と該スロット対３０にて形成される放射素子３
１とを用いた平面アンテナにおいて、図２に示す直径φ
1 を略λ／４（略５mm）にすると共に直径φ2 を略３λ
／４（略１７mm）にした、本発明に係る平面アンテナの
アンテナ効率を示している。すなわち、図４からは、１
２．２５ＧＨｚから１２．７５ＧＨｚの帯域で、最大１
０％の効率改善が成されることが確認できる。In FIG. 4, η a is a planar antenna provided with a circular hole having a diameter of approximately 3λ / 4 (approximately 17 mm), at which maximum efficiency can be obtained with a conventional planar antenna that radiates through a circular hole. , Η b is the slot pair 30 shown in FIG. 2 and the radiating element 3 formed by the slot pair 30.
In the planar antenna using 1 and 1, the diameter φ shown in FIG.
1 is approximately λ / 4 (approximately 5 mm) and diameter φ 2 is approximately 3λ
The antenna efficiency of the planar antenna according to the present invention is set to / 4 (approximately 17 mm). That is, from FIG.
Up to 1 in the band from 2.25 GHz to 12.75 GHz
It can be confirmed that an efficiency improvement of 0% is achieved.
【００１９】なお、本発明は上記実施例に限定されるも
のではなく、上記実施例の放射回路板にあっては、アル
ミニウムなどの導電性金属板にスロット対を打ち抜き加
工したものであったが、プリント基板（誘電損失の少な
いポリエステル基板などに銅箔を積層したものが好まし
い）の銅張面に前記スロット対と同形状の銅張除去部を
エッチング加工にて形成したようなものであっても良
い。The present invention is not limited to the above embodiment, but in the radiant circuit board of the above embodiment, a slot pair is punched into a conductive metal plate such as aluminum. , Such as a copper-clad surface of a printed circuit board (preferably a polyester substrate having a low dielectric loss laminated with copper foil) having a copper-clad removed portion of the same shape as the slot pair formed by etching. Is also good.
【００２０】[0020]
【発明の効果】本発明の平面アンテナは上述のように構
成したものであるから、請求項１記載の発明にあって
は、略Ｕ字状形のスロットを対向配置したスロット対
と、該スロット対にて形成される放射素子との両方にて
放射を得ることができ、その結果としてアンテナ効率の
良好なアレイアンテナからなる平面アンテナが実現で
き、請求項２記載の発明にあっては、上記効果に加え
て、金属板に前記スロット対を打ち抜いて放射回路板を
形成するので簡単且つ安価に製造でき、請求項３記載の
発明にあっては、上記効果に加えて、プリント基板自体
を絶縁層とすることができると共に放射回路板を薄い金
属箔とすることができる、優れた平面アンテナを提供で
きると言う効果を奏する。Since the planar antenna of the present invention is constructed as described above, in the invention of claim 1, a pair of slots in which substantially U-shaped slots are arranged to face each other, and the slot are provided. Radiation can be obtained from both the radiating element formed in a pair, and as a result, a planar antenna composed of an array antenna having good antenna efficiency can be realized. In addition to the effect, the radiation circuit board is formed by punching out the slot pair in the metal plate, so that the manufacturing is simple and inexpensive. In the invention of claim 3, in addition to the above effect, the printed circuit board itself is insulated. It is possible to provide an excellent planar antenna in which the radiation circuit board can be a thin metal foil as well as the layer.
【図１】本発明に係る平面アンテナの一実施例の要部を
示す分解斜視図である。FIG. 1 is an exploded perspective view showing a main part of an embodiment of a planar antenna according to the present invention.
【図２】上記実施例の放射素子の形状を示す平面図であ
る。FIG. 2 is a plan view showing the shape of a radiating element of the above-mentioned embodiment.
【図３】波長に対する放射素子の寸法比をパラメータと
したアンテナ効率の変化を示すグラフであり、（ａ）は
放射素子として円形の穴を用いた従来の平面アンテナの
アンテナ効率の特性を示し、（ｂ）は本発明の平面アン
テナのアンテナ効率の特性を示している。FIG. 3 is a graph showing a change in antenna efficiency with a dimensional ratio of a radiating element to a wavelength as a parameter, (a) showing a characteristic of antenna efficiency of a conventional planar antenna using a circular hole as a radiating element, (B) has shown the characteristic of the antenna efficiency of the planar antenna of this invention.
【図４】放射素子として円形の穴を用いた従来の平面ア
ンテナのアンテナ効率ηa と、本発明の平面アンテナの
アンテナ効率ηb とを比較して示した帯域特性図であ
る。FIG. 4 is a band characteristic diagram showing a comparison between the antenna efficiency η a of the conventional planar antenna using a circular hole as a radiating element and the antenna efficiency η b of the planar antenna of the present invention.
１ 地導体板 ２ 給電回路板 ２０ 給電回路 ３ 放射回路板 ３ａ スロット ３０ スロット対 ３１ 放射素子 Ｓ1 第１円弧 Ｓ2 第２円弧 Ｓ3 線分1 Ground Conductor Plate 2 Feed Circuit Board 20 Feed Circuit 3 Radiating Circuit Board 3a Slot 30 Slot Pair 31 Radiating Element S 1 First Arc S 2 Second Arc S 3 Line Segment
Claims (3)
板と、放射素子を設けた放射回路板とを備える平面アン
テナにおいて、前記放射素子は、直径略λ／４と直径略
３λ／４との同心円上で、直径略λ／４の円弧に沿う線
長が略０．７λである第１円弧と、直径略３λ／４の円
弧に沿う線長が略２．２λである第２円弧と、前記第１
円弧と前記第２円弧とのそれぞれの端部を略０．３λの
長さの線分で結んだ外周形状である略Ｕ字状形のスロッ
トを対向配置したスロット対を導電性平板に設けて形成
したものであり、前記給電回路板は、前記放射素子に対
応して給電回路を配置したものであることを特徴とする
平面アンテナ。但し、λは設計周波数の波長である。1. A planar antenna comprising a ground conductor plate, a feeding circuit plate provided with a feeding circuit, and a radiating circuit plate provided with a radiating element, wherein the radiating elements have a diameter of approximately λ / 4 and a diameter of approximately 3λ /. 4 on a concentric circle with 4 having a diameter of approximately λ / 4 along the arc of approximately 0.7λ, and a second arc having a diameter of approximately 3λ / 4 along the arc of approximately 2.2λ. Arc and the first
The conductive flat plate is provided with a pair of slots in which substantially U-shaped slots having an outer peripheral shape in which end portions of the circular arc and the second circular arc are connected by a line segment having a length of approximately 0.3λ are arranged to face each other. A planar antenna, characterized in that the feeder circuit board is formed by arranging a feeder circuit corresponding to the radiating element. However, λ is the wavelength of the design frequency.
対を打ち抜いて前記放射素子を形成したものであること
を特徴とする請求項１記載の平面アンテナ。2. The planar antenna according to claim 1, wherein the radiating circuit plate is a metal plate in which the slot pairs are punched to form the radiating element.
ロット対を設けて前記放射素子を形成したものであるこ
とを特徴とする請求項１記載の平面アンテナ。3. The planar antenna according to claim 1, wherein the radiating circuit board is a printed circuit board provided with the slot pairs to form the radiating element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5611794A JPH07263948A (en) | 1994-03-25 | 1994-03-25 | Planar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5611794A JPH07263948A (en) | 1994-03-25 | 1994-03-25 | Planar antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07263948A true JPH07263948A (en) | 1995-10-13 |
Family
ID=13018135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5611794A Withdrawn JPH07263948A (en) | 1994-03-25 | 1994-03-25 | Planar antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07263948A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100721871B1 (en) * | 2006-05-23 | 2007-05-25 | 위월드 주식회사 | Waveguide slot array antenna for receiving random polarized satellite signal |
-
1994
- 1994-03-25 JP JP5611794A patent/JPH07263948A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100721871B1 (en) * | 2006-05-23 | 2007-05-25 | 위월드 주식회사 | Waveguide slot array antenna for receiving random polarized satellite signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010605 |