JPS61117903A - Branch plate - Google Patents

Branch plate

Info

Publication number
JPS61117903A
JPS61117903A JP23805484A JP23805484A JPS61117903A JP S61117903 A JPS61117903 A JP S61117903A JP 23805484 A JP23805484 A JP 23805484A JP 23805484 A JP23805484 A JP 23805484A JP S61117903 A JPS61117903 A JP S61117903A
Authority
JP
Japan
Prior art keywords
plate
frequency
peripheral
wave
loss
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.)
Pending
Application number
JP23805484A
Other languages
Japanese (ja)
Inventor
Ryuichi Iwata
岩田　龍一
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP23805484A priority Critical patent/JPS61117903A/en
Publication of JPS61117903A publication Critical patent/JPS61117903A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • H01Q15/0033—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective used for beam splitting or combining, e.g. acting as a quasi-optical multiplexer

Landscapes

  • Aerials With Secondary Devices (AREA)

Abstract

PURPOSE:To obtain a branch plate with less peripheral losss and phase shift by constituting the peripheral with a metallic reflecting plate and the center with a frequency selectivity surface plate having a property transmitting selectively an electromagnetic wave. CONSTITUTION:The metallic reflecting plate 2 having a high reflectance is used for the peripheral and the frequency selective surface plate 1a is used for the center part only through which an electromagntic wave with high frequency is transmitted. In using a branch plate 1' like this, since a part (peripheral part) of a low frequency beam 11 is reflected with no loss safely by the metallic part 2 with no loss, the reflection loss by the incompleteness (due to transmittivity provided in common) of the frequency selectivity surface plate 1a is reduced rotally. Further, the reflection plate from any part of the branch plate 1' is made in phase by setting the equivalent reflction plate 6 of the frequency selectivity surface plate 1a to be made coincident with the metallic face.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、周波数選択性表面板を用いた分波板に関する
。特にその分波特性を改善した分波板に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a branching plate using a frequency selective surface plate. In particular, it relates to a splitter plate with improved splitting characteristics.

〔従来の技術〕[Conventional technology]

最近、衛星通信などの多様化に伴って、多周波数帯域を
共用するアンテナが要求されてきつつある。この要求を
満たすために、周波数の違いによって選択的に電磁波の
透過あるいは反射を行う周波数選択性表面板が分波板と
して好適なものとして考えられている。Recently, with the diversification of satellite communications and the like, there has been a growing demand for antennas that can share multiple frequency bands. To meet this requirement, a frequency-selective surface plate that selectively transmits or reflects electromagnetic waves depending on the difference in frequency is considered to be suitable as a wave splitting plate.

たとえば、従来例第５図は、アンテナの給電系に分波板
を応用した例である。この例では、２枚の楕円反射鏡２
１および２２によって形成されるビーム導波路のいわゆ
るビーム・ウェスト（ＢＷ）の位置に分波板１が挿入さ
れている。この例での分波板１は、高い周波数ｆ　　（
ｈｉｇｈ）の電磁波に対してはこれを透過し、低い周波
数ｒ　（ｌｏｗ）の電磁波は反射する高域通過型である
。ホーン２５から放射された低い周波数の波は楕円反射
鏡２３によって反射された後に、分波板１で反射され楕
円反射鏡２２へ向かう、ホーン２４から反射された高い
周波数のを磁波は楕円反射鏡２１で反射された後、分波
板１を透過し、楕円反射鏡２２へ向かう、この２つの異
なる周波数の電磁波はこのようにして１つのビームに合
成される。このような働きをする分波板１の例としては
、特願昭５５−４０８４８で述べられているような長方
形格子あるいは、長方形格子の多段構成などがある。For example, the conventional example shown in FIG. 5 is an example in which a splitter plate is applied to the feeding system of an antenna. In this example, two elliptical reflectors 2
A branching plate 1 is inserted at the so-called beam waist (BW) of the beam waveguide formed by the beam waveguides 1 and 22. The branching plate 1 in this example has a high frequency f (
It is a high-pass type that transmits high-frequency electromagnetic waves and reflects low-frequency r (low) electromagnetic waves. The low frequency waves radiated from the horn 25 are reflected by the elliptical reflector 23, and then reflected by the wave splitting plate 1 toward the elliptical reflector 22. The high frequency magnetic waves reflected from the horn 24 are reflected by the elliptical reflector 23. After being reflected at 21, the electromagnetic waves of two different frequencies are transmitted through the wave splitting plate 1 and directed toward the elliptical reflector 22, and are thus combined into one beam. Examples of the branching plate 1 that functions in this manner include a rectangular lattice as described in Japanese Patent Application No. 55-40848, or a multi-stage structure of a rectangular lattice.

従来例第６図は、第５図の分波板１の付近を拡大して描
いたものである。従来の分波板１はこの図に示すように
低い周波数のビーム１）の方の大きさに併せてその大き
さが決められている。すなわち低い周波数のビームの大
きさよりも大きく分波板の大きさを選んでいた。第７図
は、従来の分波板の応用例の別の場合で、低い周波数の
ビーム１）を放射するホーン２５と高い周波数のビーム
１２を放射するホーン２４の前面に分波板ｌが置かれて
いる。FIG. 6 of the conventional example is an enlarged view of the vicinity of the branching plate 1 in FIG. 5. As shown in this figure, the size of the conventional wave splitter plate 1 is determined according to the size of the lower frequency beam 1). In other words, the size of the splitter plate was chosen to be larger than the size of the low frequency beam. FIG. 7 shows another application example of a conventional splitter plate, in which a splitter plate l is placed in front of a horn 25 that emits a low frequency beam 1) and a horn 24 that emits a high frequency beam 12. It's dark.

この場合にも、低い周波数のビームの大きさでその大き
さが決められていた。In this case as well, the size of the beam was determined by the size of the low-frequency beam.

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

しかし低い周波数の方の分波板上のビーム・ウェストが
高い周波数の方のものより大きいので、周辺部の透過に
よる損失のばか傾斜角の増大による周辺部損失増が無視
できない、その上電磁波が分波板で反射される際に、等
個展射面が板表面と一致せず「ずれ」を生ずる問題点が
あった。However, since the beam waist on the branching plate for low frequencies is larger than that for high frequencies, the loss due to transmission at the periphery cannot be ignored, and the increase in loss at the periphery due to an increase in the tilt angle cannot be ignored. When reflected by a wave splitting plate, there was a problem in that the equal-individual projection plane did not coincide with the plate surface, resulting in a "misalignment".

本発明は上記に由来する問題点を解決するものであり、
周辺部損失および位相ずれの少ない分波板を提供するこ
とを目的とする。The present invention solves the problems arising from the above,
The object of the present invention is to provide a branching plate with low peripheral loss and phase shift.

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

本発明は、周波数選択性表面板を用いる分波板において
、上記分波板の周辺部を金属反射板となし、かつ中心部
を周波数によって選択的に電磁波を透過する性質をもつ
周波数選択性表面板で構成することを特徴とする。The present invention provides a wave splitting plate using a frequency-selective surface plate, in which the peripheral part of the wave splitting plate is a metal reflecting plate, and the central part is a frequency-selective plate having a property of selectively transmitting electromagnetic waves depending on the frequency. It is characterized by being composed of a face plate.

周辺部の金属反射板の表面反射電磁波の位相と中央部の
周波数選択性表面板の表面反射電磁波の位相とが一致し
ているように相互位置を調整してセットしたことを特徴
とする。It is characterized in that the mutual positions are adjusted and set so that the phase of the surface-reflected electromagnetic waves of the metal reflecting plate in the peripheral portion matches the phase of the surface-reflected electromagnetic wave of the frequency-selective surface plate in the central portion.

〔作用〕[Effect]

本発明の分波板は、周辺部が金属板であり、中央部が周
波数選択性表面板であるので、ビームウェストの大きい
低い周波数の電磁波の周辺反射が完全であり、全体の反
射率が増す。中央部の高周波を透過する周波数選択表面
板の部分は、周辺部の金属板の反射面とその等個展射面
とを合致させるようにセットすることにより、異なる位
相の信号の混在が少なく、多周波帯域共用アンテナの性
能の向上作用を有する。Since the branching plate of the present invention has a metal plate at the periphery and a frequency-selective surface plate at the center, the peripheral reflection of low-frequency electromagnetic waves with a large beam waist is complete, increasing the overall reflectance. . By setting the central part of the frequency-selective surface plate that transmits high frequencies so that the reflective surface of the peripheral metal plate matches its equal-individual projection surface, signals of different phases are less likely to mix, and a large number of signals are generated. It has the effect of improving the performance of frequency band shared antennas.

〔実施例〕〔Example〕

次に本発明の実施例を以下添付図面第１図〜第４図を参
照して説明する。Next, embodiments of the present invention will be described below with reference to the accompanying drawings, FIGS. 1 to 4.

周辺部が金属反射板２であり、中心部が周波数選択性表
面板１ａである第１図の改良分波板１′は、ビーム・ウ
ェスト（ＢＷ）の位置に置かれる。The improved branching plate 1' of FIG. 1 having a metal reflector plate 2 at the periphery and a frequency-selective surface plate 1a at the center is placed at the beam waist (BW).

ビーム・ウェストの大きさは周波数に反比例することが
知られている。したがって、周波数の低いビーム１）の
方が周波数の高いビーム１２よりも大きい。周波数の低
い方のビーム１）は分波板１′で反射されるのであるか
ら、周辺部は反射率の高い金属反射板とし、高い周波数
の電磁波が透過する中心部分だけ周波数選択性表面板１
ａとする。このような分波板１′を用いれば、低い周波
数のビーム１）の一部（周辺部）は損失のない金属部分
２によって無損失安全反射されるので、周波数選択性表
面板１ａの不完全性（透過性兼備のための）による、反
射損失を従来例第６図に比べ全体的に少なくすることが
できる。また、本発明の分波板１′を前記第７図の従来
の応用例での分波板ｌのかわりに用いれば、この従来の
方法では低い周波数の波１）が分波板ｌの周辺部に入射
する角度が大きいために損失が増大するのに対し、周辺
部における損失を少なくすることができることが本発明
の第一の特徴である。It is known that the size of the beam waist is inversely proportional to the frequency. Therefore, the lower frequency beam 1) is larger than the higher frequency beam 12. Since the lower frequency beam 1) is reflected by the splitter plate 1', the peripheral part should be a metal reflector with high reflectance, and the frequency selective surface plate 1 should be used only in the central part where the high frequency electromagnetic waves are transmitted.
Let it be a. If such a branching plate 1' is used, a part (periphery) of the low frequency beam 1) will be safely reflected without loss by the lossless metal part 2, so that imperfections of the frequency selective surface plate 1a will be reflected safely. Reflection loss due to the transparency (combined with transparency) can be reduced overall compared to the conventional example shown in FIG. Furthermore, if the wave splitter plate 1' of the present invention is used in place of the wave splitter plate l in the conventional application example shown in FIG. The first feature of the present invention is that the loss in the peripheral part can be reduced, whereas the loss increases due to the large angle of incidence on the peripheral part.

次に本発明の第二の特徴について述べる。Next, the second feature of the present invention will be described.

一般に、周波数選択性表面板１ａによって電磁波が反射
される場合に、反射に際して、位相遅れまたは位相進み
を生じる。例えば、長方形格子を利用した周波数選択性
表面板では、その反射波は同じ位置に置かれた金属反射
板からの反射波と比較して、位相遅れを生ずる。すなわ
ち、第２図に示すように等個展射面６は長方形格子１よ
り後方にある。Generally, when electromagnetic waves are reflected by the frequency-selective surface plate 1a, a phase delay or a phase lead occurs upon reflection. For example, in a frequency-selective surface plate using a rectangular grating, the reflected wave has a phase lag compared to the reflected wave from a metal reflector placed at the same position. That is, as shown in FIG. 2, the equal-individual projection surface 6 is located behind the rectangular grid 1.

したがって、第１図のように周辺部の金属反射板２と、
中心部の周波数選択性表面板１ａの面を同一平面上に配
置した場合には、反射波の位相がビームの中心部のみ遅
れる。その結果、位相能率の低下やビームの変形による
損失の増大が問題となる。Therefore, as shown in FIG.
When the surfaces of the frequency-selective surface plate 1a at the center are arranged on the same plane, the phase of the reflected wave is delayed only at the center of the beam. As a result, problems arise such as a decrease in phase efficiency and an increase in loss due to beam deformation.

本発明はこのような欠点を除去するために、第３図に示
すように例えば周波数選択性表面板１ａを平面反射板２
より前方に配置したものである。In order to eliminate such drawbacks, the present invention, as shown in FIG.
It is placed further forward.

すなわち、周波数選択性表面板１ａの第２図等価反射面
６を金属面に一致させるようにセットした□　ものであ
る、このようにすることにより分波板１′のどの部分か
らの反射波も同一位相となる。また本発明は、厚さのあ
る周波数選択性表面板にも適用可能である。ｒ＠波数選
択性表面板の中には、これを複数枚重ねることによって
帯域を拡張したものがある。このような周波数選択性表
面板に対しても第４図に示すように、その等個展射面を
周辺部の金属反射面２と一致させることによって分波板
１′の特性の改善がはかられる。In other words, the equivalent reflecting surface 6 shown in FIG. 2 of the frequency-selective surface plate 1a is set so as to match the metal surface.By doing this, the reflected wave from any part of the wave splitting plate 1' is eliminated. The phase will be the same. The present invention is also applicable to thick frequency selective faceplates. Some r@wavenumber-selective surface plates have a band expanded by stacking a plurality of them. Even for such a frequency selective surface plate, as shown in FIG. 4, the characteristics of the wave splitting plate 1' can be improved by making its equal-individual radiation surface coincide with the metal reflective surface 2 at the periphery. It will be done.

なお、以上の説明は平板状の分波板について行ったが、
分波板の形状は曲面であってもよい。また、本発明はい
かなる種類の周波数選択性表面板についても適用できる
。The above explanation was about a flat wave splitting plate, but
The shape of the wave splitting plate may be a curved surface. The invention is also applicable to any type of frequency selective faceplate.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明により、周波数選択性表面板を
用いた分波板の周辺部を金属板にすることによる反射損
失軽減の第一の特徴と、中心部の周波数選択性表面板の
等個展射面と上記金属板の反射面とを合致させる第二の
特徴とにより、多周波帯域共用アンテナに対する特性を
改善できる効果がある。As described above, according to the present invention, the first feature of reducing reflection loss by using a metal plate at the periphery of a branching plate using a frequency-selective face plate, and the characteristics of the frequency-selective face plate in the center The second feature of matching the individual projection surface with the reflection surface of the metal plate has the effect of improving the characteristics for a multi-frequency band antenna.

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

第１図は本発明による分波板を使用する部分の説明図。 第２図は周波数選択性表面板の等個展射面を説明する図
。 第３図は位相ずれを補正した本発明による分波板を示す
図。 第４図は厚みのある周波数選択性表面板を用いた本発明
の分波板を示す図。 第５図は分波板を使用する従来例を示す図。 第６図は従来の分波板を使用する部分の説明図。 第７図は分波板を使用する他の従来例を示す図。 １．１′・・・分波板、１ａ・・・周波数選択性表面板
、１ｂ・・・厚さのある周波数選択性表面板、２・・・
金属反射板、４・・・入射波、５・・・反射波、６・・
・等個展射面、１）・・・低い周波数のビーム、１２・
・・高い周波数のビーム、２１．２２．２３・・・楕円
反射鏡、２４・・・高い周波数のホーン、２５・・・低
い周波数のホーン。FIG. 1 is an explanatory diagram of a portion using a branching plate according to the present invention. FIG. 2 is a diagram illustrating the iso-individual projection surface of the frequency-selective surface plate. FIG. 3 is a diagram showing a wave splitting plate according to the present invention in which phase shift is corrected. FIG. 4 is a diagram showing a branching plate of the present invention using a thick frequency-selective surface plate. FIG. 5 is a diagram showing a conventional example using a branching plate. FIG. 6 is an explanatory diagram of a part using a conventional wave splitting plate. FIG. 7 is a diagram showing another conventional example using a branching plate. 1.1'...Diffusing plate, 1a...Frequency selective surface plate, 1b...Thick frequency selective surface plate, 2...
Metal reflecting plate, 4... Incident wave, 5... Reflected wave, 6...
・Equi-individual projection surface, 1)...Low frequency beam, 12.
...High frequency beam, 21.22.23...Elliptical reflector, 24...High frequency horn, 25...Low frequency horn.

Claims (2)

【特許請求の範囲】[Claims] （１）周波数選択的に電磁波の透過および反射を行う分
波板において、 分波板はその周辺部が金属反射板により構成され、その
中心部が周波数によって選択的に電磁波を透過する性質
をもつ周波数選択性表面板により構成されたことを特徴
とする分波板。(1) In a branching plate that transmits and reflects electromagnetic waves selectively in frequency, the peripheral part of the branching plate is composed of a metal reflecting plate, and the central part has the property of selectively transmitting electromagnetic waves depending on the frequency. A branching plate comprising a frequency selective surface plate. （２）金属反射板の反射面と、周波数選択性表面板の等
価反射面とが一致するように両板の相互位置が設定され
た特許請求の範囲第（１）項に記載の分波板。(2) The wave splitter plate according to claim (1), wherein the mutual positions of both plates are set so that the reflective surface of the metal reflective plate and the equivalent reflective surface of the frequency selective surface plate coincide with each other. .
JP23805484A 1984-11-12 1984-11-12 Branch plate Pending JPS61117903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23805484A JPS61117903A (en) 1984-11-12 1984-11-12 Branch plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23805484A JPS61117903A (en) 1984-11-12 1984-11-12 Branch plate

Publications (1)

Publication Number Publication Date
JPS61117903A true JPS61117903A (en) 1986-06-05

Family

ID=17024475

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23805484A Pending JPS61117903A (en) 1984-11-12 1984-11-12 Branch plate

Country Status (1)

Country Link
JP (1) JPS61117903A (en)

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