JPS63116504A - Antenna system - Google Patents

Antenna system

Info

Publication number
JPS63116504A
JPS63116504A JP26239586A JP26239586A JPS63116504A JP S63116504 A JPS63116504 A JP S63116504A JP 26239586 A JP26239586 A JP 26239586A JP 26239586 A JP26239586 A JP 26239586A JP S63116504 A JPS63116504 A JP S63116504A
Authority
JP
Japan
Prior art keywords
mirror
distribution
aperture
reflecting mirror
plane
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
Application number
JP26239586A
Other languages
Japanese (ja)
Other versions
JPH0680973B2 (en
Inventor
Masahiro Karigome
正敞 苅込
Yoshifusa Yamada
吉英 山田
Kenichi Kagoshima
憲一 鹿子嶋
Shuji Urasaki
修治 浦崎
Shigeru Makino
滋 牧野
Norio Miyahara
典夫 宮原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Mitsubishi Electric Corp
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp, Nippon Telegraph and Telephone Corp filed Critical Mitsubishi Electric Corp
Priority to JP26239586A priority Critical patent/JPH0680973B2/en
Publication of JPS63116504A publication Critical patent/JPS63116504A/en
Publication of JPH0680973B2 publication Critical patent/JPH0680973B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To suppress the reduction of a gain and to improve a side rope characteristic by making the aperture distribution of a main reflection mirror into a non-rotation symmetry by mirror-correcting the main reflection mirror and a sub-reflection mirror. CONSTITUTION:When an orthogonal coordinate system x-y with a center 0 of an aperture as an original point is determined, an electric field radiated from a primary radiator 1 is reflected by a mirror surface system, and thereafter, the main reflection mirror 5 and a sub-reflection mirror 4 are mirror- corrected so that the amplitude distribution when the field arrives at the aperture surface 6 of the main reflection mirror 5 can be different in the surface of x=0 and in the surface y=0. Consequently, when the surface of x=0 and a uniform distribution and the surface of y=0 is a taper distribution, the uniform distribution contributes to the improvement of the gain and the low side rope in the surface of y=0. The side rope characteristic in the surface of x=0 is deteriorated more than the case of the rotation symmetrical distribution.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は地上マイクロ波通信、衛星通信に用いられる
反射鏡アンテナに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reflector antenna used in terrestrial microwave communication and satellite communication.

〔従来の技術〕[Conventional technology]

従来のアンテナ装置は第5図に示すように、一次放射器
であるホーン1.副反射鏡2.および主反射鏡3で構成
されていた。ホーン1から出た電波は、図中、破線で示
すように副反射鏡2.主反射鏡3で反射して空間に放射
される。このとき、ボーン1の開口面上における電界分
布と主反射鏡3の開口面」二における電界分布との関係
を第6図に示す。ここで、ボーン1をコルゲートボーン
や複モードホーンにすれば、開口面上の等電界線は回転
対称となる。この回転対称の分布を主反射鏡3の開口分
布でも実現させるためには、ボーン1の傾きや二次曲面
である副反射鏡2.主反射鏡3の鏡面定数に一定の関係
、いわゆる交差偏波消去条件を満足させればよい。なお
、主反射鏡3であるパラボラの鏡軸を2軸、開口面をx
y面、開口面の中心を点0とし、yz面が鏡面の非対称
面である。
As shown in FIG. 5, the conventional antenna device has a horn 1. which is a primary radiator. Secondary reflector 2. and a main reflecting mirror 3. The radio waves emitted from the horn 1 are transmitted to the sub-reflector 2, as shown by the broken line in the figure. The light is reflected by the main reflecting mirror 3 and radiated into space. At this time, the relationship between the electric field distribution on the aperture surface of the bone 1 and the electric field distribution on the aperture surface 2 of the main reflecting mirror 3 is shown in FIG. Here, if the bone 1 is a corrugated bone or a multi-mode horn, the isoelectric field lines on the aperture surface will be rotationally symmetrical. In order to realize this rotationally symmetrical distribution in the aperture distribution of the main reflecting mirror 3, it is necessary to adjust the inclination of the bone 1 and the secondary reflecting mirror 2, which is a quadratic curved surface. It is only necessary to satisfy a certain relationship with the specular constant of the main reflecting mirror 3, that is, a so-called cross-polarization cancellation condition. In addition, the mirror axis of the parabola that is the main reflecting mirror 3 is 2 axes, and the aperture plane is x
The center of the y-plane and aperture plane is set to point 0, and the yz-plane is a mirror asymmetric surface.

この主反射鏡3上の回転対称な開口分布による放射パタ
ーンを第7図に示す。横軸はZ軸から測った観測角度で
あり、縦軸は放射レヘルのデシベル値を示している。図
中の破線はサイドローブレベルのエンベロープパターン
を示している。このサイドローブレベルを変化させるた
めには、第6図に示した主反射鏡3の回転対称分布の密
度をコントロールすればよい。この密度のコントロール
は副反射鏡2.主反射鏡3の鏡面形状を二次曲面から修
整曲面にすることによって可能となる。この鏡面修整に
おいて、軸対称のカセグレンアンテナに対して、修整鏡
面座標は厳密に求められるが、第5図のようなオフセラ
1〜形のカセグレンアンテナに対しては近似解法が各方
面で検討されている。
A radiation pattern due to the rotationally symmetrical aperture distribution on the main reflecting mirror 3 is shown in FIG. The horizontal axis is the observation angle measured from the Z axis, and the vertical axis shows the decibel value of the radiation level. The broken line in the figure shows the envelope pattern of the sidelobe level. In order to change this sidelobe level, the density of the rotationally symmetric distribution of the main reflecting mirror 3 shown in FIG. 6 can be controlled. This density can be controlled by sub-reflector 2. This is made possible by changing the mirror surface shape of the main reflecting mirror 3 from a quadratic curved surface to a modified curved surface. In this mirror surface modification, the modified mirror surface coordinates are strictly determined for an axially symmetrical Cassegrain antenna, but approximate solutions have been studied in various fields for Cassegrain antennas of Offsera 1~ type as shown in Figure 5. There is.

一般にサイドローブレベルを低減するためには、第6図
の主反射鏡3上の等電界線が開口中心Oに集中させれば
よい。従って、中心部で振幅レベルが高く、周辺で低い
テーパー状の開口分布となる。
Generally, in order to reduce the sidelobe level, it is sufficient to make the equipotential field lines on the main reflecting mirror 3 in FIG. 6 concentrate at the aperture center O. Therefore, the amplitude level is high at the center and low at the periphery, resulting in a tapered aperture distribution.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし、このテーパー分布の場合、ザイドローブ特性は
改善されるが、周辺部の電力が小さいため実質的に開口
が小さくなったことになり、利得が低下するという問題
点があった。
However, in the case of this tapered distribution, although the Zydrobe characteristics are improved, since the power in the peripheral portion is small, the aperture becomes substantially smaller, resulting in a problem that the gain decreases.

この発明はこの問題点を解消するためになされたもので
、ザイドローブ特性ばかりでなく利得の向上をめざした
ものである。
The present invention was made to solve this problem, and aims to improve not only the zylobe characteristics but also the gain.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係るアンテナ装置は、主反射鏡と副反射鏡と
の鏡面修整によって主反射鏡の開口分布を非回転対称に
し、利得低下を抑えてかつサイト′ローブ特性を改善す
るものである。鏡面修整は次のとおりである。すなわち
、主反射鏡の開口面」二に開口の中心点Oを原点とする
直交座標系x−yを決めたとき、一次放射器から放射さ
れた電界が鏡面系によって反射された後、上記主反射鏡
の開口面上に到達したときの振幅分布が、x=Qの面内
とy=oの面内とで異なるよう鏡面修整を行う。
The antenna device according to the present invention makes the aperture distribution of the main reflecting mirror non-rotationally symmetric by mirror-finishing the main reflecting mirror and the sub-reflecting mirror, thereby suppressing gain reduction and improving site lobe characteristics. The mirror surface correction is as follows. In other words, when we determine an orthogonal coordinate system x-y with the origin at the center point O of the aperture on the aperture surface of the main reflecting mirror, the electric field radiated from the primary radiator is reflected by the mirror system, and then Mirror surface modification is performed so that the amplitude distribution when reaching the aperture surface of the reflecting mirror is different in the plane of x=Q and in the plane of y=o.

〔作用〕[Effect]

従って、x=0の面を一様分布、y−0の面をテーパー
分布にすれば、−様分布が利得の向上およびy−oの面
内における低サイドローブ化に寄与する。なお、x=0
の面内におけるザイドローブ特性は回転対称分布の場合
よりも劣化する。
Therefore, if the x=0 plane has a uniform distribution and the y-0 plane has a tapered distribution, the --like distribution contributes to improving the gain and reducing sidelobes in the y-o plane. Note that x=0
The zydlobe characteristics in the plane of are worse than in the case of rotationally symmetric distribution.

〔発明の実施例〕[Embodiments of the invention]

以下、この発明の一実施例を図について説明する。第1
図において、1はホーン、4は鏡面修整形の副反射鏡、
5は鏡面修整形の主反射鏡、6は開口面である。このア
ンテナの動作をここでも送信の場合で説明する。ホーン
1の位相中心Fから球面波が放射しているものとし、ホ
ーン1の中心軸を極軸とする極座標系で、(θ、φ)を
図中に示している。θが一定でφを変化させた電波が副
反射鏡4.主反射鏡5の破線で示す鏡面曲線上に入射1
反射を行って開口面6と破線で示す曲線上で交わるもの
とする。第2図にはこのθが一定な円群が開口面6上で
どのように写像されたかを示すものであり、ここでは非
対称な開口分布となるようにしている。このように非対
称分布にした場合の放射パターンを第3図に示す。ここ
で、この非対称分布をzy面で一様、zx面では第7図
の放射パターンを得られるテーパー分布にしている。
An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a horn, 4 is a mirror-modified sub-reflector,
5 is a mirror-modified main reflecting mirror, and 6 is an aperture surface. The operation of this antenna will be explained here again in the case of transmission. It is assumed that a spherical wave is radiated from the phase center F of the horn 1, and (θ, φ) is shown in the figure in a polar coordinate system with the central axis of the horn 1 as the polar axis. Radio waves with constant θ and varying φ are sent to the sub-reflector 4. An incident 1 on the specular curve shown by the broken line of the main reflecting mirror 5
It is assumed that the light is reflected and intersects with the aperture surface 6 on a curve shown by a broken line. FIG. 2 shows how this group of circles with constant θ is mapped on the aperture surface 6, and here an asymmetric aperture distribution is created. FIG. 3 shows the radiation pattern when the asymmetric distribution is made in this way. Here, this asymmetric distribution is made uniform in the zy plane, and tapered in the zx plane to obtain the radiation pattern shown in FIG.

マタ、図中に第7図のサイドローブレベルのエンベロー
プも示している。従って、zy面は回転対称分布(第7
図の場合)に比ベサイドロープレベルは上界しているが
、zx面では低下しており改善されている。地上マイク
ロ波通信の場合、水平面内のサイドローブレベルが電波
干渉量を定めるので、この面内を上記zx面に対応させ
ればよい。
The sidelobe level envelope of Figure 7 is also shown in the figure. Therefore, the zy plane has a rotationally symmetric distribution (the seventh
In the case shown in the figure), the relative rope level has an upper limit, but it has decreased in the zx plane, which is an improvement. In the case of terrestrial microwave communication, the sidelobe level in the horizontal plane determines the amount of radio wave interference, so this plane may be made to correspond to the zx plane.

なお、このような非対称な開口分布を得る鏡面修整法は
各方面で報告されており、その−例を示すと次のように
なる。
Incidentally, mirror surface modification methods for obtaining such an asymmetric aperture distribution have been reported in various fields, and examples thereof are as follows.

苅込、鹿子嶋:“サイドローブレベルと交差偏波識別度
特性をともに向上しろるオフセット複反射鏡アンテナの
設計”、電子通信学会アンテナ伝播研究会技術報告AP
8147 (1984年7月)。
Karigome, Kakoshima: “Design of an offset double-reflector antenna that improves both sidelobe level and cross-polarization discrimination characteristics”, IEICE Antenna Propagation Study Group Technical Report AP
8147 (July 1984).

なお、上記実施例では複反射鏡形式としたが第4図に示
すような3枚鏡形式に使用してもよい。
In the above embodiment, a double-reflecting mirror type is used, but a three-mirror type as shown in FIG. 4 may be used.

6一 ここで、7は二次曲面である補助反射鏡であり、他は第
1図と同一である。この補助反射鏡を用いれば、ボーン
1を大地に垂直となるように配置でき、ホーン1に続く
導波管に曲がり導波管を使用しなくてもよいという利点
がある。このように、ホーン1と副反射鏡4の間に補助
反射鏡7を設けた形式についても使用できる。
6- Here, 7 is an auxiliary reflecting mirror having a quadratic curved surface, and the other parts are the same as in FIG. If this auxiliary reflecting mirror is used, the bone 1 can be arranged perpendicular to the ground, and there is an advantage that there is no need to use a curved waveguide for the waveguide following the horn 1. In this way, a type in which the auxiliary reflecting mirror 7 is provided between the horn 1 and the auxiliary reflecting mirror 4 can also be used.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明によれば主反射鏡と副反射鏡を
鏡面修正し、非対称な開口分布にしたので、サイドロー
プレベルを低くでき、電波干渉の軽減を図ることができ
る。
As described above, according to the present invention, the mirror surface of the main reflecting mirror and the sub-reflecting mirror is modified to give an asymmetric aperture distribution, so that the side rope level can be lowered and radio wave interference can be reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例による概略構成図、第2図
、第3図はこの発明を説明する図、第4図はこの発明の
他の実施例を示す概略構成図、第5図は従来のアンテナ
装置を示す概略構成図、第6図、第7図は従来のアンテ
ナ装置を説明する図である。 なお、1はポーン、2は二次曲面である副反射鏡、3は
二次曲面である主反射鏡、4は鏡面修整形の副反射鏡、
5は鏡面修整形の主反射鏡、6は開口面、7は補助反射
鏡である。 代理人  大  岩  増  雄(ばか2名)第2図 第3図 (a)ZY面 山)ZX面 第6図 C久) 第7図
FIG. 1 is a schematic diagram of an embodiment of the invention, FIGS. 2 and 3 are diagrams for explaining the invention, FIG. 4 is a schematic diagram of another embodiment of the invention, and FIG. is a schematic configuration diagram showing a conventional antenna device, and FIGS. 6 and 7 are diagrams for explaining the conventional antenna device. In addition, 1 is a pawn, 2 is a sub-reflector which is a quadratic curved surface, 3 is a main reflector which is a quadratic curved surface, 4 is a sub-reflector with mirror surface modification,
5 is a mirror-modified main reflecting mirror, 6 is an aperture surface, and 7 is an auxiliary reflecting mirror. Agent Masuo Oiwa (2 idiots) Figure 2 Figure 3 (a) ZY side Figure 6 C) Figure 7

Claims (3)

【特許請求の範囲】[Claims] (1)主反射鏡と副反射鏡とを含む鏡面系と一次放射器
とよりなるアンテナ装置において、主反射鏡の開口面上
に開口の中心点0を原点とする直交座標系x−yを決め
たとき、一次放射器から放射された電界が鏡面系によっ
て反射された後、上記主反射鏡の開口面上に到達したと
きの振幅分布が、x=0の面内とy=0の面内とで異な
るよう主反射鏡と副反射鏡とを鏡面修整したことを特徴
とするアンテナ装置。
(1) In an antenna device consisting of a mirror system including a main reflector and a sub-reflector and a primary radiator, a rectangular coordinate system x-y with the origin at the center point 0 of the aperture is created on the aperture surface of the main reflector. When determined, the amplitude distribution when the electric field emitted from the primary radiator reaches the aperture surface of the main reflecting mirror after being reflected by the mirror system is within the plane of x=0 and the plane of y=0. An antenna device characterized in that a main reflecting mirror and a sub-reflecting mirror are mirror-finished so that they differ from each other.
(2)上記x=0の面内での振幅分布をほぼ一様分布、
y=0の面内での振幅分布を低サイドローブ型の分布と
したことを特徴とする特許請求の範囲第1項記載のアン
テナ装置。
(2) The amplitude distribution in the plane of x=0 is approximately uniform distribution,
2. The antenna device according to claim 1, wherein the amplitude distribution in the plane of y=0 is a low sidelobe type distribution.
(3)上記副反射鏡と一次放射器との間に、複数枚の二
次曲面鏡を設けたことを特徴とする特許請求の範囲第1
項記載のアンテナ装置。
(3) Claim 1, characterized in that a plurality of quadratic curved mirrors are provided between the sub-reflector and the primary radiator.
Antenna device as described in section.
JP26239586A 1986-11-04 1986-11-04 Antenna device Expired - Lifetime JPH0680973B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26239586A JPH0680973B2 (en) 1986-11-04 1986-11-04 Antenna device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26239586A JPH0680973B2 (en) 1986-11-04 1986-11-04 Antenna device

Publications (2)

Publication Number Publication Date
JPS63116504A true JPS63116504A (en) 1988-05-20
JPH0680973B2 JPH0680973B2 (en) 1994-10-12

Family

ID=17375169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26239586A Expired - Lifetime JPH0680973B2 (en) 1986-11-04 1986-11-04 Antenna device

Country Status (1)

Country Link
JP (1) JPH0680973B2 (en)

Also Published As

Publication number Publication date
JPH0680973B2 (en) 1994-10-12

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