JPS61212103A - Antenna system - Google Patents
Antenna systemInfo
- Publication number
- JPS61212103A JPS61212103A JP5280485A JP5280485A JPS61212103A JP S61212103 A JPS61212103 A JP S61212103A JP 5280485 A JP5280485 A JP 5280485A JP 5280485 A JP5280485 A JP 5280485A JP S61212103 A JPS61212103 A JP S61212103A
- Authority
- JP
- Japan
- Prior art keywords
- circularly polarized
- handed circularly
- handed
- primary radiator
- reflector
- 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
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
【発明の詳細な説明】
く技術分野〉
本発明は異なる静止軌道位置にある衛星等からくる、左
旋右旋両円偏波信号を受信することのできるアンテナシ
ステムに関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an antenna system capable of receiving left-handed and right-handed circularly polarized signals coming from satellites and the like located in different geostationary orbit positions.
〈従来技術〉
近年衛工放送が実用化されつつある。特に１２ＧＨｚ帯
を用いる衛星放送では、各国間チャンネル間干渉を避け
る為左旋円偏波、右旋円偏波の使用割当、周波数の使用
割当が決定されている。又静止衛星の軌道の位置も多く
の国々に対して決定されている。<Prior art> In recent years, sanitary broadcasting has been put into practical use. In particular, in satellite broadcasting using the 12 GHz band, use assignments for left-handed circularly polarized waves, right-handed circularly polarized waves, and frequency usage assignments are determined in order to avoid interference between channels between countries. The orbital positions of geostationary satellites have also been determined for many countries.
−ｍに衛星受信アンテナシステムは、１つのアンテナリ
フレクタと１つの一次放射器により構成され一次放射器
は、リフレクタの１焦点に固定される。文通常、一次放
射器は、円偏波の場合、左旋ないしは右旋円偏波のどち
らか一方を受信できるよう設計され、使われる。-m The satellite receiving antenna system consists of one antenna reflector and one primary radiator, and the primary radiator is fixed at one focal point of the reflector. Normally, primary radiators are designed and used to receive either left-handed or right-handed circularly polarized waves.
従って、従来の方式によれば異った衛星からくる左旋な
いしは、右旋円偏波を受信する場合には、複数個のりフ
レフタ及び一次放射器を備えたアンテナシステムが必要
とされ、それら受信設備に対する費用や、建設の手間が
それに対応し必要とされた。Therefore, according to the conventional method, when receiving left-handed or right-handed circularly polarized waves coming from different satellites, an antenna system equipped with multiple beam flaps and primary radiators is required, and these receiving equipment are required. Corresponding costs and construction efforts were required.
〈発明の目的〉
上記のような状況下において、１つの衛星受信アンテナ
システムを用いて異なる静止軌道位置の衛星からの異な
った左旋及び右旋円偏波信号を受信できる方式が実現す
れば、使用上極めて有効である。本発明はかかる課題を
達成できるアンテナシステムの提供を目的とする
〈発明の構成〉
本発明は上記目的を達成するため、オフセットパラボラ
リフレクタなど幾何学的に非対称な形状を有する電波反
射板（リフレクタ）と左旋及び右旋円偏波用一次放射器
を同時に又は個々に前記リフレクタに対して相対的に異
なった位置に配置し、それぞれの一次放射器から異なる
方向より到来する左旋及び右旋円偏波を取出するもので
ある。即ち非対称形リフレクタによる左旋円偏波と右旋
円偏波の反射指向（ビーム）の差を利用し、異なる位置
に左旋及び右旋円偏波一次放射器を配置し、外部より異
なる方向で入射し、リフレクタで反射した両円偏波信号
を個々の放射器により取出すという原理である。<Purpose of the Invention> Under the above circumstances, if a method is realized that can receive different left-handed and right-handed circularly polarized signals from satellites in different geostationary orbit positions using one satellite receiving antenna system, it will be possible to use It is extremely effective. An object of the present invention is to provide an antenna system capable of achieving the above-described object. In order to achieve the above object, the present invention provides a radio wave reflecting plate (reflector) having a geometrically asymmetrical shape, such as an offset parabolic reflector. and primary radiators for left-handed and right-handed circularly polarized waves are arranged simultaneously or individually at different positions relative to the reflector, and the left-handed and right-handed circularly polarized waves arrive from different directions from the respective primary radiators. It is for extracting. In other words, by utilizing the difference in the reflection direction (beam) of left-handed circularly polarized waves and right-handed circularly polarized waves by an asymmetric reflector, left-handed and right-handed circularly polarized primary radiators are placed at different positions, and the beams are incident from the outside in different directions. The principle is that both circularly polarized signals reflected by the reflector are extracted by individual radiators.
この原理に基づき、本発明は回転放物面あるいは放物柱
面などの曲面の一部からなる電波反射板と、右旋円偏波
一次放射器と、左旋円偏波一次放射器とを備え、前記電
波反射板を電波反射特性が右旋円偏波及び左旋円偏波に
対して異なった放射特性を与える幾何学的に非対称な形
状に形成し、電波反射板曲面の焦点付近の２つの位置に
前記右旋円偏波一次放射器と前記左旋円偏波一次放射器
とをそれぞれ固定し、真円偏波一次放射器から放射され
た両円偏波信号を上記電波反射板により反射させて異な
った方向に放射することを特徴とするアンテナシステム
である。Based on this principle, the present invention includes a radio wave reflecting plate made of a part of a curved surface such as a paraboloid of revolution or a parabolic cylinder, a right-handed circularly polarized primary radiator, and a left-handed circularly polarized primary radiator. , the radio wave reflector is formed into a geometrically asymmetric shape in which the radio wave reflection characteristics give different radiation characteristics for right-handed circularly polarized waves and left-handed circularly polarized waves, and two areas near the focal point of the curved surface of the radio wave reflector are formed. Fixing the right-handed circularly polarized primary radiator and the left-handed circularly polarized primary radiator at respective positions, and reflecting both circularly polarized signals emitted from the perfectly circularly polarized primary radiator by the radio wave reflecting plate. This antenna system is characterized by radiating in different directions.
〈実施例〉
第１図は本発明の実施例を示すアンテナの平面図、第２
図は通常のオフセットパラボラアンテナを上からみた場
合の円偏波反射ビーム特性を示す図、第３図は実施例の
アンテナの反射特性を説明するためのりフレフタの側面
図である。<Example> Figure 1 is a plan view of an antenna showing an example of the present invention, and Figure 2 is a plan view of an antenna showing an example of the present invention.
The figure is a diagram showing circularly polarized reflected beam characteristics when a normal offset parabolic antenna is viewed from above, and FIG. 3 is a side view of a lifter for explaining the reflection characteristics of the antenna of the embodiment.
実施例として回転放物面の一部を抜きとった非対称オフ
セットパラボラアンテナを用いたアンテナシステムにつ
いて説明する。As an example, an antenna system using an asymmetric offset parabolic antenna obtained by removing a part of a paraboloid of rotation will be described.
第１図において、１は電波反射板（リフレクタ）、２は
右旋円偏波一次放射器、３は左旋円偏波一次放射器、４
は右旋円偏波信号を送出する衛星、５は左旋円偏波信号
を送出する衛星、６はリフレクタの焦点である。前記リ
フレクタ１は回転放物面の一部を抜きとった形に構成さ
れる。この抜きとりがたについて第２図、第３図で説明
する。今、第２図のオフセットパラボラアンテナのりフ
レクタフの焦点８に一次放射器をおいた場合を考えると
、リフレフタフの非対称性から右旋円偏波９と左旋円偏
波１０の主ビームのピーク方向が偏移する。このピーク
方向の偏移量は回転放物面のどの位置からりフレフタを
抜きとるかによって変化する。In Fig. 1, 1 is a radio wave reflector, 2 is a right-handed circularly polarized primary radiator, 3 is a left-handed circularly polarized primary radiator, and 4 is a left-handed circularly polarized primary radiator.
5 is a satellite that transmits a right-handed circularly polarized signal, 5 is a satellite that transmits a left-handed circularly polarized signal, and 6 is the focal point of the reflector. The reflector 1 is constructed in the shape of a paraboloid of revolution with a portion removed. This extraction process will be explained with reference to FIGS. 2 and 3. Now, if we consider the case where the primary radiator is placed at the focal point 8 of the offset parabolic antenna flexure in Fig. 2, the peak directions of the main beams of the right-handed circularly polarized wave 9 and the left-handed circularly polarized wave 10 will be deviate. The amount of deviation in the peak direction changes depending on the position on the paraboloid of revolution from which the flap is removed.
すなわち、第３図に示すように、回転放物面１１からり
フレフタ１２を抜きとる場合、焦点１３からりフレフタ
１２の端点１２ａ、１２ｂに線を引いたときの角度θＣ
９θ０が大きい程、前記偏移量が大きくなる。したがっ
て本発明のりフレフタ１く第１図）はこのθＣ２θＯが
大きくなるように回転放物面から抜きとって構成する。That is, as shown in FIG. 3, when removing the flefter 12 from the paraboloid of revolution 11, the angle θC when a line is drawn from the focal point 13 to the end points 12a and 12b of the flefter 12
The larger 9θ0 is, the larger the deviation amount becomes. Therefore, the glue flap 1 (FIG. 1) of the present invention is constructed by extracting from the paraboloid of revolution so that this θC2θO becomes large.
そしてこの場合、第１図に示すように、右旋円偏波一次
放射器２を上方向からみて焦点６の右に配置し、左旋円
偏波一次放射器３を焦点６の左に配置する。In this case, as shown in FIG. 1, the right-handed circularly polarized primary radiator 2 is placed to the right of the focal point 6 when viewed from above, and the left-handed circularly polarized primary radiator 3 is placed to the left of the focal point 6. .
このとき、各々の一次放射器２．３の移動量は、第１図
中のθを、θ＋θ１がビームの偏移量と等しくなるよう
にして移動配置させる。このようにすることで、右旋、
左旋の百円偏波の主ビームの方向が、それぞれ右旋円偏
波を送出する衛星４、左旋円偏波を送出する衛星５の方
向を向（。従ってアンテナの可逆定理により２つの一次
放射器２゜３では衛星から送信した電波を利得の低下少
なく受信できる。At this time, the amount of movement of each primary radiator 2.3 is such that θ in FIG. 1 becomes equal to the amount of deviation of the beam. By doing this, right rotation,
The direction of the main beam of the left-handed circularly polarized wave is directed to the satellite 4 which transmits the right-handed circularly polarized wave, and the satellite 5 which transmits the left-handed circularly polarized wave (Thus, by the antenna reversibility theorem, two primary radiation The device 2.3 can receive radio waves transmitted from the satellite with little loss of gain.
〈発明の効果〉
本発明の以上の構成よりなり、オフセントパラボラアン
テナの如く、幾何学的に非対称形状をもつリフレクタに
おいて、左旋及び右旋の百円偏波特性をもつ２つの一次
放射器をそれぞれ異なった位置に配置したので、２つの
静止軌道位置からくる左旋、右旋の両円偏波信号をそれ
ぞれの放射器で分離し、送信ないし受信できる。よって
特に複数個の衛星から送信されてくる異なった円偏波特
性をもつ信号を１つのりフレフタにより同時に受信がで
き、放送衛星受信機等において極めて有効である。<Effects of the Invention> According to the above configuration of the present invention, in a reflector having a geometrically asymmetrical shape such as an off-cent parabolic antenna, two primary radiators having left-handed and right-handed 100-circular polarization characteristics are provided. Since they are placed at different positions, both left-handed and right-handed circularly polarized signals coming from the two geostationary orbit positions can be separated by each radiator and transmitted or received. Therefore, in particular, signals having different circular polarization characteristics transmitted from a plurality of satellites can be simultaneously received by a single flap, which is extremely effective in broadcasting satellite receivers and the like.
第１図は本発明の実施例を示すアンテナの平面図、第２
図は通常のオフセントパラボラアンテナを上からみた場
合の円偏波反射ビーム特性を示す図、第３図は実施例の
システムの反射特性を説明するためのりフレフタの側面
図である。
１・・・電波反射板（リフレクタ）
２・・・右旋円偏波一次放射器
３・・・左旋円偏波一次放射Ｂ ６・・・焦点特許
出願人 シャープ株式会社
代 理 人 弁理士 西１） 新
第１図FIG. 1 is a plan view of an antenna showing an embodiment of the present invention, and FIG.
The figure is a diagram showing circularly polarized reflected beam characteristics when a normal off-cent parabolic antenna is viewed from above, and FIG. 3 is a side view of a lifter for explaining the reflection characteristics of the system of the embodiment. 1... Radio wave reflecting plate (reflector) 2... Right-handed circularly polarized primary radiator 3... Left-handed circularly polarized primary radiation B 6... Focus patent applicant Sharp Corporation Representative Patent attorney Nishi 1) New Figure 1
Claims (2)
らなる電波反射板と、右旋円偏波一次放射器と、左旋円
偏波一次放射器とを備え、前記電波反射板を電波反射特
性が右旋円偏波及び左旋円偏波に対して異なった放射特
性を与える幾何学的に非対称な形状に形成し、電波反射
板曲面の焦点付近の２つの位置に前記右旋円偏波一次放
射器と前記左旋円偏波一次放射器とをそれぞれ固定し、
両円偏波一次放射器から放射された両円偏波信号を上記
電波反射板により反射させて異なった方向に放射するこ
とを特徴とするアンテナシステム。(1) A radio wave reflecting plate comprising a part of a curved surface such as a paraboloid of revolution or a parabolic cylinder, a right-handed circularly polarized primary radiator, and a left-handed circularly polarized primary radiator, the radio wave reflecting plate is formed into a geometrically asymmetrical shape whose radio wave reflection characteristics give different radiation characteristics for right-handed circularly polarized waves and left-handed circularly polarized waves, and the right-handed circularly polarized waves are placed at two positions near the focal point of the curved surface of the radio wave reflector plate. fixing the circularly polarized primary radiator and the left-handed circularly polarized primary radiator, respectively;
An antenna system characterized in that bicircularly polarized signals emitted from a bicircularly polarized primary radiator are reflected by the radio wave reflector and radiated in different directions.
旋ないし左旋円偏波一次放射器により受信する特許請求
の範囲第１項記載のアンテナシステム。(2) The antenna system according to claim 1, wherein right-handed or left-handed circularly polarized signals from different directions are received by a right-handed or left-handed circularly polarized primary radiator.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5280485A JPS61212103A (en) | 1985-03-15 | 1985-03-15 | Antenna system |
| CA000498266A CA1258707A (en) | 1984-12-26 | 1985-12-20 | Antenna system |
| EP85309418A EP0186496B1 (en) | 1984-12-26 | 1985-12-23 | Antenna system for circularly polarized waves |
| DE8585309418T DE3584958D1 (en) | 1984-12-26 | 1985-12-23 | AERIAL SYSTEM FOR CIRCULAR POLARIZED WAVES. |
| US06/813,535 US4712111A (en) | 1984-12-26 | 1985-12-26 | Antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5280485A JPS61212103A (en) | 1985-03-15 | 1985-03-15 | Antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61212103A true JPS61212103A (en) | 1986-09-20 |
| JPH0547002B2 JPH0547002B2 (en) | 1993-07-15 |
Family
ID=12925027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5280485A Granted JPS61212103A (en) | 1984-12-26 | 1985-03-15 | Antenna system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61212103A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5062345A (en) * | 1973-10-01 | 1975-05-28 | ||
| JPS58197901A (en) * | 1982-05-13 | 1983-11-17 | Mitsubishi Electric Corp | Offset parabolic antenna |
-
1985
- 1985-03-15 JP JP5280485A patent/JPS61212103A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5062345A (en) * | 1973-10-01 | 1975-05-28 | ||
| JPS58197901A (en) * | 1982-05-13 | 1983-11-17 | Mitsubishi Electric Corp | Offset parabolic antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0547002B2 (en) | 1993-07-15 |
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