JPH0817281B2 - Satellite broadcast reception converter - Google Patents
Satellite broadcast reception converterInfo
- Publication number
- JPH0817281B2 JPH0817281B2 JP62192903A JP19290387A JPH0817281B2 JP H0817281 B2 JPH0817281 B2 JP H0817281B2 JP 62192903 A JP62192903 A JP 62192903A JP 19290387 A JP19290387 A JP 19290387A JP H0817281 B2 JPH0817281 B2 JP H0817281B2
- Authority
- JP
- Japan
- Prior art keywords
- waveguide
- converter
- msl
- free space
- mode filter
- 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.)
- Expired - Lifetime
Links
- 230000010287 polarization Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 239000006096 absorbing agent Substances 0.000 claims description 14
- 238000005388 cross polarization Methods 0.000 claims description 14
- 230000005672 electromagnetic field Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 2
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 230000005684 electric field Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Structure Of Receivers (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、円偏波を使用した12GHz帯（11.7〜12.7GH
z）等の衛星放送用の受信コンバータ（周波数変換装
置）に関するものである。The present invention relates to a 12 GHz band (11.7 to 12.7GH) using circular polarization.
It relates to a receiving converter (frequency conversion device) for satellite broadcasting such as z).
従来の技術 円偏波マイクロ波信号を放物面反射鏡の焦点に配置し
た一次放射器で受信し、その信号を直線偏波に変換して
後、導波管−MSL変換部によりマイクロストリップ線路
による受信コンバータ回路に導びく場合、従来は、第５
図に示すような装置が用いられていた。Conventional technology Circularly polarized microwave signals are received by a primary radiator placed at the focal point of a parabolic reflector, converted to linearly polarized waves, and then a waveguide-MSL converter is used to generate a microstrip line. In the case of leading to the receiving converter circuit by
A device as shown in the figure was used.
第５図は、受信コンバータ筐体56の内部に円偏波−直
線偏波変換部51、導波管−MSL変換部52、モード・フィ
ルタ53および交差偏波終端部54を上記順序に配置した構
造を有している。上記交差偏波終端部54は、第６図に示
すように円形導波管61内の交差偏波成分の電界に平行な
直径上に配した薄板状電波吸収体63により交差偏波成分
を吸収していた。In FIG. 5, a circular polarization-linear polarization conversion section 51, a waveguide-MSL conversion section 52, a mode filter 53, and a cross polarization termination section 54 are arranged inside the receiving converter housing 56 in the above order. It has a structure. As shown in FIG. 6, the cross-polarized wave terminating portion 54 absorbs the cross-polarized wave component by the thin plate electromagnetic wave absorber 63 arranged on the diameter parallel to the electric field of the cross-polarized wave component in the circular waveguide 61. Was.
発明が解決しようとする問題点 上述のように、従来の交差偏波終端部54は、円形導波
管により構成され、管軸方向寸法が約1/2〜１管内波長
分必要であり、受信コンバータの小型化のための一つの
難点となっていた。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, the conventional cross-polarized wave terminating portion 54 is composed of a circular waveguide, and the dimension in the tube axis direction is required to be about 1/2 to 1 in-tube wavelength. It was one of the difficulties for downsizing the converter.
本発明は、衛星放送受信コンバータが従来有していた
円形導波管による交差偏波終端部により上記受信コンバ
ータの小型化のさまたげになっていたという問題点を解
決することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the problem that a satellite broadcast receiving converter has a conventional cross-polarized wave terminating portion formed of a circular waveguide, which hinders the miniaturization of the receiving converter.
問題点を解決するための手段 上述の問題点を解決するために、本発明は、円形導波
管による交差偏波終端部をなくし、導波管内の交差偏波
成分を透過させるモードフィルタを円形導波管の終端部
に設置し、上記モードフィルタを介して導波管外自由空
間に透過した交差偏波成分の一部を吸収させるため、自
由空間電磁界に対して電波吸収作用を呈する平板状電波
吸収体を導波管外自由空間に導波管の管軸方向に対向し
て配置することを特徴とする。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention eliminates a cross-polarization terminating portion by a circular waveguide, and a circular mode filter for transmitting a cross-polarization component in the waveguide. A flat plate that is installed at the end of the waveguide and absorbs part of the cross-polarization component that has been transmitted to the free space outside the waveguide through the mode filter, and thus exhibits a radio wave absorption effect on the free space electromagnetic field. The electromagnetic wave absorber is arranged in a free space outside the waveguide so as to face the waveguide axis direction.
作用 かかる本発明の構成によれば、受信コンバータの入力
部から入力された円偏波信号は、円偏波−直線偏波変換
部で直線偏波信号に変換される。変換された直線偏波信
号のうち所望の成分は、導波管−MSL変換部に後置され
るモード・フィルタで反射され導波管−MSL変換部でマ
イクロストリップ線路部でマイクロストリップ線路モー
ドに変換され受信コンバータ回路へ導かれる。一方、不
要な交差偏波成分は、導波管−MSL変換部に後置され導
波管終端部となるモードフィルタを透過し、導波管外自
由空間に放射されるが、上記モードフィルタ終端部近傍
の導波管外自由空間に導波管の管軸に対向して設置され
た平板状電波吸収体によりその一部分が吸収され、上記
電波吸収体および導波管外の電波反射物により反射され
て上記モードフィルタを介して上記導波管外へ再入射さ
れる交差偏波成分の入射量を軽減する。なお、上述した
導波管外自由空間へ放射した電磁界は導波管開口面放射
の原理から導波管外空間の全域に拡がるので、単なる導
波管内での反射のようにその全エネルギーが導波管に再
入射されることはなく、上記板状電波吸収体の板面寸法
を加減して上記再入射のエネルギー量を調節できる。Action According to the configuration of the present invention, the circular polarization signal input from the input unit of the reception converter is converted into the linear polarization signal by the circular polarization / linear polarization conversion unit. The desired component of the converted linearly polarized signal is reflected by the mode filter that is placed after the waveguide-MSL converter, and is converted to the microstrip line mode by the waveguide-MSL converter and the microstrip line section. It is converted and guided to the reception converter circuit. On the other hand, the unnecessary cross-polarized component passes through the mode filter that is placed after the waveguide-MSL conversion section and serves as the waveguide termination section, and is radiated to the free space outside the waveguide. Part is absorbed by the flat wave absorber installed in the free space outside the waveguide near the pipe section, facing the tube axis of the waveguide, and reflected by the wave absorber and the wave reflector outside the waveguide. Then, the incident amount of the cross polarization component re-incident outside the waveguide through the mode filter is reduced. Note that the electromagnetic field radiated to the free space outside the waveguide described above spreads over the entire space outside the waveguide due to the principle of radiation from the waveguide opening surface, so that the total energy of the electromagnetic field is just like reflection inside the waveguide. The re-incident energy amount can be adjusted by adjusting the plate surface size of the plate-shaped electromagnetic wave absorber without being re-incident on the waveguide.
実施例 本発明の実施例について、以下図面に基づいて説明す
る。第１図は、本発明の実施例を示す。本実施例は、円
偏波−直線偏波変換部11、導波管−MSL変換部12、モー
ド・フィルタ13、平板状電波吸収体14とが受信コンバー
タ回路筐体16内に図のように配置され、導波管−MSL変
換部12に受信コーバータ回路部15が接続されている。平
板状電波吸収体14は、板面形状が円形または多角形でか
つ面寸法が導波管開口面よりも大きく筐体16の内壁に密
着固定されている。Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In this embodiment, the circular polarization-linear polarization conversion unit 11, the waveguide-MSL conversion unit 12, the mode filter 13, and the plate-shaped electromagnetic wave absorber 14 are provided in the receiving converter circuit housing 16 as shown in the figure. The waveguide-MSL conversion unit 12 is arranged, and the reception coater circuit unit 15 is connected to the waveguide-MSL conversion unit 12. The plate-shaped electromagnetic wave absorber 14 has a plate surface shape of a circle or a polygon, and a surface dimension larger than that of the waveguide opening surface, and is closely fixed to the inner wall of the housing 16.
円偏波−直線偏波変換部11は、第２図に示したよう
に、直線偏波のTE11モードの電界ベクトルと45°の角度
をなして円形導波管21の直径上に挿入された電界ベクト
ルが板面に平行なTE11モードと垂直なTE11モードとの位
相差が1/4波長の誘電体位相板22によって構成され、こ
れによって受信された円偏波信号が直線偏波信号に変換
される。変換された直線偏波信号のうち所望の成分23
は、第４図に示したような導波管−MSL変換部12によっ
て、円形導波管TE11モードからマイクロストリップ線路
モードに変換され、受信コンバータ回路15へ導かれて、
低雑音増幅と周波数変換が施され、出力コネクタ18から
出力される。The circular polarization-linear polarization converter 11 is inserted on the diameter of the circular waveguide 21 at an angle of 45 ° with the electric field vector of the TE 11 mode of linear polarization, as shown in FIG. The phase difference between the TE 11 mode in which the electric field vector is parallel to the plate surface and the TE 11 mode in the direction perpendicular to the plate surface is composed of a dielectric phase plate 22 with a wavelength of 1/4. Converted to a signal. The desired component of the converted linearly polarized signal 23
Is converted from the circular waveguide TE 11 mode to the microstrip line mode by the waveguide-MSL converter 12 as shown in FIG.
After low-noise amplification and frequency conversion, it is output from the output connector 18.
一方、円偏波−直線偏波変換部11で変換された直線偏
波信号のうち不要な偏波成分である交差偏波成分24は、
モード・フィルタ13を透過し、モード・フィルタ終端部
から導波管外へ放射され、管軸に対向しかつモード・フ
ィルタ終端部に近接配置された平板状電波吸収体14によ
り吸収される。上記平板状電波吸収体14により、モード
・フィルタ終端部から放射された交差偏波成分が筐体の
端面で反射し、導波管内に再入射され、受信コンバータ
の交差偏波識別度の劣化を防いでいる。On the other hand, the cross polarization component 24, which is an unnecessary polarization component in the linear polarization signal converted by the circular polarization-linear polarization conversion unit 11, is
It passes through the mode filter 13, is radiated from the end of the mode filter to the outside of the waveguide, and is absorbed by the flat plate-shaped electromagnetic wave absorber 14 that is arranged opposite to the tube axis and close to the end of the mode filter. Due to the plate-shaped wave absorber 14, the cross polarization component radiated from the end of the mode filter is reflected by the end face of the housing and re-enters the waveguide, thereby degrading the cross polarization discrimination of the reception converter. It is preventing.
モード・フィルタ13としては、第３図のような線格子
状の金属薄板が用いられ、電界ベクトルが線格子と平行
な所望の偏波成分31は、反射されて導波管−MSL変換で
変換され、電界ベクトルが線格子と垂直な交差偏波成分
32は、透過し、終端部から導波管外へ放射される。As the mode filter 13, a thin metal plate in the form of a line grating as shown in FIG. 3 is used, and a desired polarization component 31 whose electric field vector is parallel to the line grating is reflected and converted by waveguide-MSL conversion. And the electric field vector is the cross polarization component perpendicular to the line grating.
32 passes through and is radiated from the end portion to the outside of the waveguide.
なお、第４図に導波管−MSL変換部12の構造を示す。
受信コンバータ回路と電磁気的に結合される導波管プロ
ーブ42は、所望の偏波成分の電界ベクトル43と平行で、
不要な交差偏波成分の電界ベクトル44と垂直な関係にあ
る。The structure of the waveguide-MSL converter 12 is shown in FIG.
The waveguide probe 42 electromagnetically coupled to the receiving converter circuit is parallel to the electric field vector 43 of the desired polarization component,
It has a vertical relationship with the electric field vector 44 of the unnecessary cross polarization component.
発明の効果 本発明によれば、上述のように、平板状の交差偏波吸
収体をモード・フィルタ終端部に近接した導波管外に、
板面が導波管の管軸に垂直になるように配置するので、
従来例に比して、受信コンバータの管軸方向寸法が飛躍
的に短縮でき、受信コンバータの小型化に有効なる手段
を提供し、工業的価値大なるものがある。EFFECTS OF THE INVENTION According to the present invention, as described above, the plate-shaped cross-polarization absorber is provided outside the waveguide near the end of the mode filter,
Since it is arranged so that the plate surface is perpendicular to the waveguide axis,
Compared with the conventional example, the size of the receiving converter in the tube axis direction can be remarkably shortened, and a means effective for downsizing the receiving converter is provided, which is of great industrial value.
第１図は本発明の一実施例における衛星放送用受信コン
バータの正面図、第２図（ａ），（ｂ）は同コンバータ
に使用される円偏波−直線偏波変換部の正面図および側
面図、第３図（ａ），（ｂ）は同コンバータに使用され
るモード・フィルタの正面図および側面図、第４図は同
コンバータに使用される導波管−MSL変換部の正面図、
第５図は従来例における衛星放送受信コンバータの正面
図、第６図（ａ），（ｂ）は同コンバータに使用される
交差偏波終端部の正面図および側面図である。 11……円偏波−直線偏波変換部、12……導波管−MSL変
換部、13……モールド・フィルタ、14……平板状電波吸
収体、15……受信コンバータ回路。FIG. 1 is a front view of a satellite broadcast reception converter according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are front views of a circular polarization-linear polarization conversion unit used in the converter. Side views, FIGS. 3 (a) and 3 (b) are a front view and a side view of a mode filter used in the converter, and FIG. 4 is a front view of a waveguide-MSL conversion unit used in the converter. ,
FIG. 5 is a front view of a satellite broadcast receiving converter in a conventional example, and FIGS. 6 (a) and 6 (b) are a front view and a side view of a cross polarization termination unit used in the converter. 11 …… Circular polarization-linear polarization converter, 12 …… Waveguide-MSL converter, 13 …… Mold filter, 14 …… Plate absorber, 15 …… Receive converter circuit.
Claims (1)
星放送信号を受信するコンバータであって、 円形導波管により形成された円偏波−直線偏波変換部
と、 導波管−MSL（マイクロストリップ線路）変換部と、 前記導波管−MSL変換部で変換される直線偏波成分と直
交する交差偏波成分を透過させるとともに上記交差偏波
成分を導波管外の自由空間に放射させるためのモードフ
ィルタと、 自由空間電磁界に対して電波吸収作用を呈する平板状電
波吸収体とを備え、 前記筐体内部で前記導波管−MSL変換部に対して前記円
偏波−直線偏波変換部を前置するとともに前記モードフ
ィルタを後置し、前記平板状電波吸収体を導波管外自由
空間に導波管の管軸方向に対向して配置し、 前記モードフィルタを透過して導波管外の自由空間に放
射された交差偏波成分の一部を前記平板状電波吸収体に
より吸収させるようにしたことを特徴とする衛星放送用
受信コンバータ。1. A converter for receiving a circularly polarized microwave satellite broadcast signal housed in a housing, the circularly polarized wave-linearly polarized wave conversion section being formed by a circular waveguide, and a waveguide. -MSL (microstrip line) conversion unit, and transmits the cross polarization component orthogonal to the linear polarization component converted by the waveguide-MSL conversion unit, while allowing the cross polarization component to be freely provided outside the waveguide. It is equipped with a mode filter for radiating into space and a plate-shaped electromagnetic wave absorber exhibiting an electromagnetic wave absorbing action with respect to a free space electromagnetic field. The wave-linear polarization converter is placed in front and the mode filter is placed in front, and the plate-shaped electromagnetic wave absorber is arranged in a free space outside the waveguide so as to face in the tube axis direction of the waveguide. The radiation radiated into the free space outside the waveguide through the filter. Satellite receiving converter, wherein a part of the polarization components so as to be absorbed by the flat wave absorber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62192903A JPH0817281B2 (en) | 1987-07-31 | 1987-07-31 | Satellite broadcast reception converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62192903A JPH0817281B2 (en) | 1987-07-31 | 1987-07-31 | Satellite broadcast reception converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6437109A JPS6437109A (en) | 1989-02-07 |
| JPH0817281B2 true JPH0817281B2 (en) | 1996-02-21 |
Family
ID=16298897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62192903A Expired - Lifetime JPH0817281B2 (en) | 1987-07-31 | 1987-07-31 | Satellite broadcast reception converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0817281B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100870661B1 (en) | 2002-03-15 | 2008-11-26 | 엘지디스플레이 주식회사 | Board storage cassette |
| JP5671933B2 (en) | 2010-10-18 | 2015-02-18 | ソニー株式会社 | Signal transmission device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5442227B2 (en) * | 1973-04-16 | 1979-12-13 | ||
| JPS60148201A (en) * | 1984-01-13 | 1985-08-05 | Nec Corp | Tem mode converter of waveguide |
-
1987
- 1987-07-31 JP JP62192903A patent/JPH0817281B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6437109A (en) | 1989-02-07 |
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