JPH0345002A - Dual reflecting mirror antenna - Google Patents
Dual reflecting mirror antennaInfo
- Publication number
- JPH0345002A JPH0345002A JP18094089A JP18094089A JPH0345002A JP H0345002 A JPH0345002 A JP H0345002A JP 18094089 A JP18094089 A JP 18094089A JP 18094089 A JP18094089 A JP 18094089A JP H0345002 A JPH0345002 A JP H0345002A
- Authority
- JP
- Japan
- Prior art keywords
- reflecting mirror
- antenna
- reflector
- mirror
- main
- 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.)
- Granted
Links
- 230000009977 dual effect Effects 0.000 title 1
- 239000004020 conductor Substances 0.000 claims abstract description 8
- 239000012811 non-conductive material Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 abstract description 6
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業の利用分野）
この発明は、例えば人工衛星に搭載されるカセグレンア
ンテナ等の複反射鏡アンテナに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a multi-reflector antenna such as a Cassegrain antenna mounted on an artificial satellite, for example.
（従来の技術）
一般に、この種の複反射鏡アンテナは第４図に示すよう
に、主成ＪＨＶｔ ｌ上に複数の支柱部材２を設け、こ
の支柱部材２の先端部には副反射鏡３が主反射鏡１に対
向させて配設される。そして、主反射鏡１と副反射鏡３
の中間部には一次放射器４が設けられる。これにより、
−次放射器４から放射された電磁波は、先ず副反射ｖｔ
３で反射され、その反射波がさらに主反射鏡１で反射さ
れて指向方向に放射される。(Prior Art) In general, this type of multi-reflector antenna, as shown in FIG. is arranged to face the main reflecting mirror 1. Then, the main reflector 1 and the sub-reflector 3
A primary radiator 4 is provided in the middle of the radiator. This results in
-The electromagnetic wave radiated from the secondary radiator 4 first undergoes secondary reflection vt
3, the reflected wave is further reflected by the main reflecting mirror 1 and radiated in the directional direction.
ところが、上記複反射鏡アンテナでは、−次放射器４か
ら放射された電磁波が副反射鏡３で反射された後、主反
射鏡１に反射される際、電磁波が支柱部材２に遮蔽され
るいわゆるブロッキング作用によりアンテナ利得Ｇが低
下するという問題を有する。すなわち、アンテナ利得Ｇ
は、電磁波の波長をλ、アンテナ有効開口面積をＡ、と
すると、
４π
Ｇ−・Ａ。However, in the double reflector antenna described above, when the electromagnetic waves radiated from the -order radiator 4 are reflected by the sub-reflector 3 and then reflected by the main reflector 1, the electromagnetic waves are blocked by the support member 2. There is a problem in that the antenna gain G decreases due to the blocking effect. That is, the antenna gain G
If the wavelength of the electromagnetic wave is λ and the effective aperture area of the antenna is A, then 4π G-・A.
λ２
の式で表されることにより、第５図に示すように支柱部
材２に遮蔽されて電磁波が主反射鏡１上に放射されない
部分（第５図中斜線で示す）が生じると、実質的にアン
テナ有効開口面積Ａ＃が低下することとなり、低下する
ものである。つまり、これは、支柱部材２が強度等の点
から金属材料や、ＣＦ ＲＰ （Ｃａｒｂｏｎ Ｆｉｂ
ｅｒ Ｒｅ１ｎｌ’ｏｒｃｅｄ Ｐｌａｓｔｉｃｓ）等
の導電性材料で形成されているために、副反射鏡３で反
射された電磁波を反射して主反射鏡１への放射がブロッ
キングされ、実質的なアンテナ有効開口面積Ａ、が低下
することによる。As shown in FIG. 5, if there is a part (indicated by diagonal lines in FIG. 5) where the electromagnetic waves are not radiated onto the main reflecting mirror 1 because it is shielded by the support member 2, Therefore, the antenna effective aperture area A# decreases. In other words, this means that the strut member 2 is made of metal material or CF RP (Carbon Fib) from the viewpoint of strength etc.
Since the antenna is made of a conductive material such as plastics, it reflects the electromagnetic waves reflected by the sub-reflector 3 and blocks radiation to the main reflector 1, reducing the effective antenna aperture area. This is due to the decrease in A.
（発明が解決しようとする課題）
以上のべたように、従来の副反射鏡を主反射鏡上に設置
する複反射鏡アンテナでは、アンテナ開口面積を有効に
利用することが困難で、アンテナ利得が低下されるとい
う問題を有していた。(Problems to be Solved by the Invention) As described above, in the conventional double-reflector antenna in which the sub-reflector is installed on the main reflector, it is difficult to effectively utilize the antenna aperture area, and the antenna gain is It had the problem of being degraded.
この発明は上記の事情に鑑みてなされたもので、簡易な
構成で、アンテナ有効開口面積の有効利用を実現して、
可及的にアンテナ利得の向上を図り得るように複反射鏡
アンテナを提供することを目的とする。This invention was made in view of the above circumstances, and has a simple configuration, realizing effective use of the effective antenna aperture area, and
It is an object of the present invention to provide a multi-reflector antenna that can improve antenna gain as much as possible.
［発明の構成］
（課題を解決するための手段）
この発明は、主反射鏡に対して副反射鏡及び−次放射器
を組み合わせ配置した複反射鏡アンテナにおいて、前記
副反射鏡を前記主反射鏡上に設置してなるもので、非導
電性材料で形成され、前記副反射鏡に取付けられる非導
電部、及び導電性材料で形成され、前記主反射鏡に取付
けられる導電部が連続して設けられている複数の支柱部
材を備えて構成したものである。[Structure of the Invention] (Means for Solving the Problems) The present invention provides a multi-reflector antenna in which a sub-reflector and a secondary radiator are arranged in combination with a main reflector, in which the sub-reflector is used as the main reflector. It is installed on a mirror, and includes a non-conductive part made of a non-conductive material and attached to the sub-reflector, and a conductive part made of a conductive material and attached to the main reflector. The structure includes a plurality of support members provided.
（作 用）
上記構成によれば、支柱部材は、その導電部の剛性によ
り副反射鏡を主反射鏡上における所定の位置に保持し、
かつ、副反射鏡で反射された電磁波を、その非導電部で
透過させて主反射鏡に案内することにより、ブロッキン
グによる電磁波の遮蔽を削減する。従って、副反射鏡の
確実な保持を実現したうえで、支柱部材のブロッキング
によるアンテナ有効開口面積の軽減が防止されて、アン
テナ特性の高利得化が図れる。(Function) According to the above configuration, the support member holds the sub-reflector at a predetermined position on the main reflector by the rigidity of its conductive portion,
In addition, by allowing the electromagnetic waves reflected by the sub-reflector to pass through the non-conductive portion and guiding them to the main reflector, shielding of the electromagnetic waves due to blocking is reduced. Therefore, after realizing reliable holding of the sub-reflector, reduction in the antenna effective aperture area due to blocking of the support member is prevented, and high gain of antenna characteristics can be achieved.
（実施例）
以下、この発明の実施例について、図面を参照して詳細
に説明する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図はこの発明の一実施例に係る複反射鏡アンテナを
示すもので、主反射鏡１０上には例えば４本の支柱部材
１１が立設される。この支柱部材１１はそれぞれ同様に
金属材料あるいはＣＦＲＰ等の導電性材料で形成した導
電部１１ａと、Ｇ Ｆ ＲＰ （Ｇｒａｓｓ Ｆｉｂｅ
ｒ Ｒｅ１ｎｌ’ｏｒｃｅｄ Ｐｌａｓｔｉｃｓ）等の
非導電材料で形成した非導電部１１ｂが接合されており
、その導電部１１ａが主反射鏡１０に取付けられ、その
非導電部１１ｂが副反射鏡１２に取付られる。この場合
、支柱部材１１における導電部１１ａと非導電部１１ｂ
の割合については、その剛性等を考慮して適宜に設定さ
れる。また、主反射鏡１０上には図示しない内部機器に
接続され一次放射器１３が副反射鏡１２に対向させて配
設される。FIG. 1 shows a multi-reflector antenna according to an embodiment of the present invention, in which, for example, four pillar members 11 are erected on a main reflector 10. Each of the pillar members 11 includes a conductive portion 11a formed of a metal material or a conductive material such as CFRP, and a G F RP (Grass Fiber).
A non-conductive part 11b made of a non-conductive material such as 100% conductive plastics or the like is bonded, the conductive part 11a is attached to the main reflecting mirror 10, and the non-conductive part 11b is attached to the sub-reflecting mirror 12. . In this case, the conductive part 11a and the non-conductive part 11b in the support member 11
The ratio is appropriately set in consideration of the rigidity and the like. Further, a primary radiator 13 is disposed on the main reflecting mirror 10 so as to face the sub-reflecting mirror 12 and is connected to an internal device (not shown).
上記構成において、−次放射器１３から放射された電磁
波は側腹反射ｙｔ１２で反射された後、主反射ｆｉｌＯ
に放射され、所望の指向方向に放射される。この際、副
反射鏡１２で反射した電磁波は、そのうち非導電部１１
ｂに照射されたものが該非導電部１１ｂを透過して主反
射鏡１０１：放射され、他方の支柱部材１１の導電部１
１ａに照射されものが該導電部１１ａに遮蔽されてブロ
ッキングされる（第２図参照）。この結果、支柱部材１
１にブロッキングされる電磁波は、導電部１１ａにより
遮蔽される主反射ｍ １０の鏡面における略中央部の第
２図中斜線で示す部分だけとなり、副反射ｍ１２からの
電磁波か主反射ｖｔ１０のアンテナ有効開口面積の略全
域を効率的に利用して所望の指向方向に放射される。In the above configuration, the electromagnetic wave radiated from the -order radiator 13 is reflected by the flank reflection yt12, and then the main reflection filO
and is radiated in the desired direction. At this time, the electromagnetic waves reflected by the sub-reflector 12 are transferred to the non-conductive part 11.
The radiation irradiated to the main reflecting mirror 101 is transmitted through the non-conductive portion 11b and is radiated to the conductive portion 1 of the other support member 11.
1a is shielded and blocked by the conductive portion 11a (see FIG. 2). As a result, support member 1
The electromagnetic waves that are blocked by the conductive part 11a are only in the shaded area in FIG. The light is radiated in a desired direction by efficiently utilizing substantially the entire aperture area.
また、上記説明では、電磁波を送信する場合を代表して
説明したが、これに限ることなく、電磁波を受信する場
合にも同様のもので、ここでは使宜上、その説明につい
ては省略する。Further, in the above description, the case where electromagnetic waves are transmitted has been described as a representative example, but the case is not limited to this, and the same applies to the case where electromagnetic waves are received, and the description thereof will be omitted here for convenience.
このように、上記複反射鏡アンテナは、非導電性材料で
形成した非導電部１１ｂと、導電性材料で形成した導電
部１１ａを連続して設けた支柱部材１１を備え、この支
柱部材１１の導電部１１ａを主反射鏡１０に取付け、そ
の非導電部１１ｂを副反射鏡１２に取付けることにより
、副反射鏡１２を主反射鏡１０上に設置するように構成
した。これによれば、支柱部材１１は、その導電部１１
．１により所定の剛性が確保されて、副反射鏡１２の主
反射鏡１０への保持を行わしめ、かつ、その非導電部１
１ｂにおいて副反射鏡１２からの電磁波を透過して、そ
のブロッキングによる電磁波の遮蔽を軽減することによ
り、アンテナ有効開口面積の有効利用を図り、アンテナ
利得の向上を実現する。In this way, the above-mentioned double-reflector antenna includes a support member 11 in which a non-conductive part 11b made of a non-conductive material and a conductive part 11a made of a conductive material are continuously provided. The conductive part 11a is attached to the main reflecting mirror 10, and the non-conductive part 11b is attached to the sub-reflecting mirror 12, so that the sub-reflecting mirror 12 is installed on the main reflecting mirror 10. According to this, the support member 11 has its conductive portion 11
．． 1 ensures a predetermined rigidity and holds the sub-reflector 12 to the main reflector 10, and the non-conductive portion 1
By transmitting the electromagnetic waves from the sub-reflector 12 at 1b and reducing the shielding of the electromagnetic waves due to blocking, the effective use of the antenna effective aperture area is achieved, and the antenna gain is improved.
なお、この発明は上記実施例に限ることなく、例えば第
３図に示すように支柱部材１１を補強する補強部材１４
を設けて構成することも可能で、これによると、導電部
１１ａに対する非導電部１１ｂの割合を増加することが
可能となることにより、さらに有効な効果が期待できる
。この場合補強部材１４としては、非導電性材料で形成
したり、あるいは導電性材料で形成して主反射鏡１０の
取付部分の近傍に取付けるように構成することで、さら
にブロッキングの防止が促進される。Note that the present invention is not limited to the above-mentioned embodiments, and for example, as shown in FIG.
According to this, it is possible to increase the ratio of the non-conductive part 11b to the conductive part 11a, and more effective effects can be expected. In this case, blocking can be further prevented by forming the reinforcing member 14 from a non-conductive material or from a conductive material and attaching it near the mounting portion of the main reflecting mirror 10. Ru.
また、上記実施例では、４本の支柱部材１１を組合わせ
構成したが、この本数に限ることなく、組合わせ構成可
能である。Further, in the above embodiment, the four pillar members 11 are combined to form a structure, but the number is not limited to this, and a combination can be formed.
よって、この発明は上記実施例に限ることなく、その他
、この発明の要旨を逸脱しない範囲で種々の変形を実施
し得ることは勿論のことである。Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.
〔発明の効果コ
以上詳述したように、この発明によれば、簡易な構成で
、アンテナ有効開口面積の有効利用を実現して、可及的
にアンテナ利得の向上を図り得るように複反射鏡アンテ
ナを提供することができる。[Effects of the Invention] As detailed above, according to the present invention, the effective use of the antenna effective aperture area can be realized with a simple configuration, and multiple reflections can be achieved to improve the antenna gain as much as possible. A mirror antenna can be provided.
第１図はこの発明の一実施例に係る複反射鏡アンテナを
示す構成図、第２図は第１図の要部を拡大して示す図、
第３図はこの発明の他の実施例を示す図、第４図及び第
５図は従来の複反射鏡アンテナを示す図である。
１０・・・主反射鏡、１１・・・支柱部材、ｌｌａ・・
・導電部、ｌｌｂ・・・非導電部、１２・・・副反射鏡
、１３・・・−次放射器、１４・・・補強部材。FIG. 1 is a configuration diagram showing a double-reflector antenna according to an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1,
FIG. 3 is a diagram showing another embodiment of the present invention, and FIGS. 4 and 5 are diagrams showing a conventional double-reflector antenna. 10... Main reflecting mirror, 11... Support member, lla...
- Conductive part, llb... Non-conductive part, 12... Sub-reflector, 13... -order radiator, 14... Reinforcement member.
Claims (1)
配置した複反射鏡アンテナにおいて、前記副反射鏡を前
記主反射鏡上に設置してなるもので、非導電性材料で形
成され、前記副反射鏡に取付けられる非導電部、及び導
電性材料で形成され、前記主反射鏡に取付けられる導電
部が連続して設けられている複数の支柱部材を具備した
ことを特徴とする複反射鏡アンテナ。A multi-reflector antenna in which a sub-reflector and a primary radiator are arranged in combination with a main reflector, in which the sub-reflector is installed on the main reflector, and is made of a non-conductive material; A double-reflector comprising a plurality of support members in which a non-conductive part is attached to a sub-reflector, and a conductive part made of a conductive material is successively provided to be attached to the main reflector. antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01180940A JP3077984B2 (en) | 1989-07-13 | 1989-07-13 | Double reflector antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01180940A JP3077984B2 (en) | 1989-07-13 | 1989-07-13 | Double reflector antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0345002A true JPH0345002A (en) | 1991-02-26 |
| JP3077984B2 JP3077984B2 (en) | 2000-08-21 |
Family
ID=16091939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01180940A Expired - Lifetime JP3077984B2 (en) | 1989-07-13 | 1989-07-13 | Double reflector antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3077984B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04268803A (en) * | 1991-02-22 | 1992-09-24 | Mitsubishi Electric Corp | Double-reflector antenna system |
| CN103022723A (en) * | 2012-12-12 | 2013-04-03 | 上海航天测控通信研究所 | Small flat ring focus parabolic antenna |
-
1989
- 1989-07-13 JP JP01180940A patent/JP3077984B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04268803A (en) * | 1991-02-22 | 1992-09-24 | Mitsubishi Electric Corp | Double-reflector antenna system |
| CN103022723A (en) * | 2012-12-12 | 2013-04-03 | 上海航天测控通信研究所 | Small flat ring focus parabolic antenna |
| CN103022723B (en) * | 2012-12-12 | 2015-02-04 | 上海航天测控通信研究所 | Small flat ring focus parabolic antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3077984B2 (en) | 2000-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3195137A (en) | Cassegrainian antenna with aperture blocking correction | |
| US4376940A (en) | Antenna arrangements for suppressing selected sidelobes | |
| US3096519A (en) | Composite reflector for two independent orthogonally polarized beams | |
| US4665405A (en) | Antenna having two crossed cylindro-parabolic reflectors | |
| GB2130804A (en) | Dual reflector antenna system | |
| JPH0345002A (en) | Dual reflecting mirror antenna | |
| US4431997A (en) | Compound element for image element antennas | |
| US6628238B2 (en) | Sub-reflector for dual-reflector antenna system | |
| JP2001053538A (en) | Antenna system | |
| JPS5951769B2 (en) | Low sidelobe antenna device | |
| US4355316A (en) | Offset J-hook reflector antenna | |
| JP3034262B2 (en) | Aperture antenna device | |
| JP2687413B2 (en) | Reflector antenna | |
| JP2687414B2 (en) | Reflector antenna | |
| JPS6330005A (en) | Ffrequency shared type antena system | |
| JP2687415B2 (en) | Reflector antenna | |
| JPS6324705A (en) | Double reflection mirror antenna | |
| JPS5963804A (en) | Antenna device | |
| JPH0567915A (en) | Multi-beam antenna | |
| JPS58175302A (en) | Antenna device | |
| JPH047123B2 (en) | ||
| JPS60170304A (en) | Antenna system | |
| JPS6298805A (en) | Sub-reflection mirror antenna | |
| JPH04277906A (en) | Parabolic antenna | |
| JPS59169206A (en) | Antenna device |