JPH09148808A - Input structure of lnb - Google Patents
Input structure of lnbInfo
- Publication number
- JPH09148808A JPH09148808A JP30112095A JP30112095A JPH09148808A JP H09148808 A JPH09148808 A JP H09148808A JP 30112095 A JP30112095 A JP 30112095A JP 30112095 A JP30112095 A JP 30112095A JP H09148808 A JPH09148808 A JP H09148808A
- Authority
- JP
- Japan
- Prior art keywords
- input
- circuit board
- housing
- lnb
- casing
- 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
Links
Landscapes
- Waveguide Aerials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＢＳ／ＣＳアンテナの
入力部等に使用する、導波管入力又はフィードホーン入
力構造を持つＬＮＢの同軸モードと導波管モード間変換
の損失を低減したＬＮＢの入力構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces the loss of conversion between the coaxial mode and the waveguide mode of an LNB having a waveguide input or feed horn input structure, which is used in the input section of a BS / CS antenna. It relates to the input structure of the LNB.
【０００２】[0002]
【従来の技術】図３は、ＬＮＢの入力構造の１例の
（Ａ）正面図、（Ｂ）側面断面図である。従来のＬＮＢ
入力部の基本的な構造は、導波管入力部３４を有する筐
体３３と回路基板３２と同軸−導波管モード変換のため
のピックアッププローブ３１とプローブ３１の先端を覆
う円筒形絶縁体からなるジャケット３１ｂ及び回路基板
３２からの電磁波の放射を防ぐためのシールドケース
（図示せず）からなり、導波管入力部３４から入射した
電波をプローブ３１で回路基板３２に取り込んでいる。
このような構造では、ピックアッププローブ周辺の回路
基板３３の裏面導体パターンはグランド面として完全に
筐体３３に密着させておくことが必要となり、わずかで
も隙間が生ずるとその部分から入力信号の一部が漏れだ
して損失となるため、ＬＮＢの雑音指数を劣化させる原
因となる。しかし、この部分の接触を良くするために
は、回路基板のピックアップ周辺にネジを打ったり、シ
ールドケースで押さえる等の対策が必要となるが、ピッ
クアップ３１周辺の回路基板の表面は回路部品やパター
ンが密集しており、この対策の適用が困難であるという
問題があった。2. Description of the Related Art FIGS. 3A and 3B are a front view and a side sectional view of an example of an input structure of an LNB. Conventional LNB
The basic structure of the input unit is a housing 33 having a waveguide input unit 34, a circuit board 32, a pickup probe 31 for coaxial-waveguide mode conversion, and a cylindrical insulator covering the tip of the probe 31. It is composed of a jacket 31b and a shield case (not shown) for preventing the emission of electromagnetic waves from the circuit board 32, and the radio wave incident from the waveguide input section 34 is taken into the circuit board 32 by the probe 31.
In such a structure, the back surface conductor pattern of the circuit board 33 around the pickup probe needs to be completely adhered to the housing 33 as a ground surface, and if a slight gap is generated, a part of the input signal is input from that portion. Leaks out and becomes a loss, which causes deterioration of the noise figure of the LNB. However, in order to improve the contact of this portion, it is necessary to take measures such as screwing around the pickup of the circuit board or pressing it with a shield case. However, there was a problem that it was difficult to apply this measure.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記問題点に
鑑みなされたもので、ピックアッププローブ周辺のグラ
ンド面と筐体の接触が不十分であっても電磁波漏れの心
配のない低損失のＬＮＢの入力構造を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a low-loss LNB that does not worry about electromagnetic wave leakage even if the contact between the ground surface around the pickup probe and the housing is insufficient. To provide an input structure for.
【０００４】[0004]
【課題を解決するための手段】導波管入力部若しくはフ
ィードホーン入力部を持つ筐体と、入力電波信号のピッ
クアップ手段を備え、同導波管入力部若しくはフィード
ホーン入力部から入力された電波信号を回路基板に取り
込むＬＮＢ（ローノイズブロックダウンコンバータ）に
おいて、ピックアップ手段と前記筐体の接触部にチョー
ク構造を設けることにより入力部の損失を低減させる。[MEANS FOR SOLVING THE PROBLEMS] A housing having a waveguide input section or a feed horn input section and a pickup means for an input radio wave signal are provided, and a radio wave input from the waveguide input section or the feed horn input section is provided. In an LNB (low noise block down converter) that takes in a signal to a circuit board, a choke structure is provided at the contact portion between the pickup means and the casing to reduce the loss at the input portion.
【０００５】ピックアップ手段と筐体の接触部に設ける
チョーク構造は、筐体と回路基板間に形成したピックア
ップ手段の中心を中心とする円柱形の凹部とする。The choke structure provided at the contact portion between the pickup means and the housing is a cylindrical recess centered on the center of the pickup means formed between the housing and the circuit board.
【０００６】円柱形半径から筐体のピックアップ手段の
ための開口部の半径を差し引いた値は、入力電波信号の
線路内波長の２分の１とし、かつ、同円柱形の深さは入
力電波信号の線路内波長の１０分の１から１００分の１
程度と、線路内波長より十分小さくする。The value obtained by subtracting the radius of the opening for the pick-up means of the housing from the radius of the cylindrical shape is half the wavelength in the line of the input radio wave signal, and the depth of the cylindrical shape is the input radio wave. One-tenth to one-hundredth of the wavelength of the signal in the line
And the wavelength is sufficiently smaller than the wavelength in the line.
【０００７】ピックアップ手段と筐体の接触部に設ける
チョーク構造は、筐体と回路基板間に形成したピックア
ップ手段の中心を中心とする円柱形の凹部と同円柱形の
外周部に形成した円筒形の凹部とする。The choke structure provided at the contact portion between the pickup means and the casing has a cylindrical recess formed around the center of the pickup means formed between the casing and the circuit board and a cylindrical shape formed on the outer periphery of the same cylindrical shape. To be a concave part.
【０００８】円柱形半径から筐体のピックアップ手段の
ための開口部の半径を差し引いた値及び円筒形の回路基
板面からの深さは、入力電波信号の線路内波長の４分の
１とし、かつ、円柱形の深さと円筒形の筒の厚さは、入
力電波信号の波長より十分小さくする。The value obtained by subtracting the radius of the opening for the pickup means of the casing from the cylindrical radius and the depth from the surface of the cylindrical circuit board are set to 1/4 of the in-line wavelength of the input radio signal. In addition, the depth of the cylindrical shape and the thickness of the cylindrical shape are sufficiently smaller than the wavelength of the input radio signal.
【０００９】ピックアップ手段は、回路基板から筐体の
導波管入力部に挿入したピックアッププローブ、回路基
板に形成したパターン、伝送線路で給電するスロットア
ンテナ、伝送線路で給電するパッチアンテナ又はスロッ
トで給電するパッチアンテナとする。The pickup means is a pickup probe inserted from the circuit board into the waveguide input section of the housing, a pattern formed on the circuit board, a slot antenna feeding through the transmission line, a patch antenna feeding through the transmission line, or feeding through the slot. Use as a patch antenna.
【００１０】[0010]
【作用】導波管入力部若しくはフィードホーン入力部を
持つ筐体と、入力電波信号のピックアップ手段を備え、
同導波管入力部若しくはフィードホーン入力部から入力
された電波信号を回路基板に取り込むＬＮＢにおいて、
ピックアップ手段と前記筐体の接触部にチョーク構造を
設けることにより、ピックアップ周辺の回路基板のグラ
ンド面を実効的に筐体に短絡させることができ、入力部
の損失を低減できる。[Function] A housing having a waveguide input section or a feed horn input section and a pickup means for input radio signal are provided,
In the LNB that takes in the radio signal input from the same waveguide input section or feed horn input section to the circuit board,
By providing the choke structure at the contact portion between the pickup means and the casing, the ground plane of the circuit board around the pickup can be effectively short-circuited to the casing, and the loss of the input portion can be reduced.
【００１１】ピックアップ手段と筐体の接触部に設ける
チョーク構造は、筐体と回路基板間に形成したピックア
ップ手段の中心を中心とする円柱形の凹部とすること
で、簡単な構造で所期の目的が達成できる。The choke structure provided at the contact portion between the pick-up means and the housing is a cylindrical structure centered on the center of the pick-up means formed between the housing and the circuit board. The purpose can be achieved.
【００１２】円柱形の筐体のピックアップ手段のための
開口部を差し引いた半径は、入力電波信号の線路内波長
の２分の１とし、かつ、同円柱形の深さは入力電波信号
の線路内波長より十分小さくする構造とすることで、ピ
ックアップ手段の周辺部のグランド面は実効的に筐体と
短絡される。The radius obtained by subtracting the opening for the pickup means of the cylindrical casing is one half of the wavelength in the line of the input radio signal, and the depth of the column is the line of the input radio signal. By making the structure sufficiently smaller than the internal wavelength, the ground plane in the peripheral portion of the pickup means is effectively short-circuited with the housing.
【００１３】ピックアップ手段と筐体の接触部に設ける
チョーク構造は、筐体と回路基板間に形成したピックア
ップ手段の中心を中心とする円柱形の凹部と同円柱形の
外周部に形成した円筒形の凹部とすることで、円柱形の
凹部の外周部でも回路基板のグランド面と筐体との密着
性が要求されない。The choke structure provided at the contact portion between the pickup means and the casing has a cylindrical recess formed around the center of the pickup means formed between the casing and the circuit board and a cylindrical shape formed on the outer periphery of the same cylindrical shape. By forming the concave portion, the adhesion between the ground surface of the circuit board and the housing is not required even in the outer peripheral portion of the cylindrical concave portion.
【００１４】円柱形の筐体のピックアップ手段のための
開口部を差し引いた半径及び円筒形の回路基板面からの
深さは、入力電波信号の線路内波長の４分の１とし、か
つ、円柱形の深さと円筒形の筒の厚さは、入力電波信号
の波長より十分小さくすることで、ピックアップ手段の
周辺部のグランド面は実効的に筐体と短絡される。The radius from which the opening for the pick-up means of the cylindrical housing is subtracted and the depth from the surface of the cylindrical circuit board are set to ¼ of the in-line wavelength of the input radio signal, and the cylindrical shape. By making the depth of the shape and the thickness of the cylindrical tube sufficiently smaller than the wavelength of the input radio signal, the ground plane in the peripheral portion of the pickup means is effectively short-circuited with the housing.
【００１５】ピックアップ手段は、回路基板から筐体の
導波管入力部に挿入したピックアッププローブ、回路基
板に形成したパターン、伝送線路で給電するスロットア
ンテナ、伝送線路で給電するパッチアンテナ又はスロッ
トで給電するパッチアンテナのいずれかとすることで、
上記低損失入力が実現できるピックアップ手段が得られ
る。The pickup means is a pickup probe inserted from the circuit board into the waveguide input section of the housing, a pattern formed on the circuit board, a slot antenna feeding through the transmission line, a patch antenna feeding through the transmission line, or feeding through the slot. By using one of the patch antennas,
A pickup means that can realize the above-mentioned low loss input can be obtained.
【００１６】[0016]
【実施例】以下、本発明によるＬＮＢの入力構造につい
て、図を用いて詳細に説明する。図１は、本発明による
ＬＮＢの入力構造の１実施例の（Ａ）ピックアッププロ
ーブ周辺部の側面断面図、（Ｂ）同等価回路である。図
３に示すものと同様な導波管入力部をもつ導体からなる
筐体３の上に回路基板２があり、回路基板２から筐体３
を通して絶縁体１ｂで保護されたピックアッププローブ
１が挿入され、導波管入力部からの入力電波信号を導波
管モードから同軸モードに変換して回路基板２に取り込
んで入力電波を受信する。筐体３の回路基板２の下のピ
ックアッププローブ１の外周部には、円柱形の凹部５が
形成されている。円柱形５の半径から筐体のピックアッ
ププローブのための筐体の開口である絶縁体１ｂの半径
を差し引いた値Ｌ１は、入力電波の線路内波長λｇの２
分の１としてある。また、円柱形の凹部５の深さＤは前
記線路内波長λｇの１０分の１から１００分の１程度と
λｇに比べて十分小さいものとする。このとき、ピック
アッププローブ周辺部の等価回路は同図（Ｂ）となり、
円柱形の凹部５のピックアッププローブのための筐体の
開口部の外周部ａ点から円柱形の凹部５の外周部ｂ点を
見た入力インピーダンスは、先端短絡のλｇ／２線路と
等しくなり短絡状態となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The LNB input structure according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of a peripheral portion of a pickup probe (A) of an embodiment of an LNB input structure according to the present invention, and (B) an equivalent circuit thereof. There is a circuit board 2 on a housing 3 made of a conductor having a waveguide input part similar to that shown in FIG.
The pickup probe 1 protected by the insulator 1b is inserted therethrough to convert the input radio wave signal from the waveguide input section from the waveguide mode to the coaxial mode and take it into the circuit board 2 to receive the input radio wave. A cylindrical recess 5 is formed on the outer peripheral portion of the pickup probe 1 below the circuit board 2 of the housing 3. A value L1 obtained by subtracting the radius of the insulator 1b, which is the opening of the housing for the pickup probe of the housing, from the radius of the cylindrical shape 5 is 2 of the wavelength λg in the line of the input radio wave.
It is one-third. The depth D of the cylindrical recess 5 is about 1/10 to 1/100 of the in-line wavelength λg, which is sufficiently smaller than λg. At this time, the equivalent circuit around the pickup probe is as shown in FIG.
The input impedance from the outer peripheral portion a point of the opening of the housing for the pickup probe of the cylindrical concave portion 5 to the outer peripheral portion b point of the cylindrical concave portion 5 becomes equal to the tip short-circuited λg / 2 line and short-circuited. It becomes a state.
【００１７】図２は、本発明によるＬＮＢの入力構造の
別の実施例の（Ａ）ピックアッププローブ周辺部の側面
断面図、（Ｂ）同等価回路である。上記と同様に、図３
に示すものと同様な導波管入力部をもつ導体からなる筐
体２３の上に回路基板２２があり、回路基板２２から筐
体２３を通して絶縁体２１ｂで保護されたピックアップ
プローブ２１が挿入され、導波管入力部からの入力電波
信号を導波管モードから同軸モードに変換して回路基板
２２に取り込んで入力電波を受信する。筐体２３の回路
基板２２の下のピックアッププローブ２１の外周部に
は、円柱形の凹部２５と同円柱形の凹部２５の外周部に
は、円筒形の凹部２６が形成されている。円柱形２５の
半径から筐体のピックアッププローブのための筐体の開
口である絶縁体２１ｂの半径を差し引いた値Ｌ２は、入
力電波の線路内波長λｇの４分の１とする。また、円筒
形２６の深さＬ３も同じく入力電波の線路内波長λｇの
４分の１とする。さらに、円柱形の凹部２５の深さＤ及
び円筒形２６の筒の厚さＤは前記線路内波長λｇの１０
分の１から１００分の１とλｇと比べて十分小さいもの
とする。このとき、ピックアッププローブ周辺部の等価
回路は同図（Ｂ）となり、円柱形の凹部２５のピックア
ッププローブのための筐体の開口部の外周部ｃ点から円
筒形の凹部２６の底部ｅ点を見た入力インピーダンス
は、先端短絡のλｇ／２線路と等しくなり短絡状態とな
る。ただし、円柱部２５の外周部ｄ点は電流の節に当た
るため、この点で基板２２と筐体２３の接触が不十分で
あっても上記作用に影響しない。FIG. 2 is a side sectional view of a peripheral portion of a pickup probe of another embodiment of the input structure of the LNB according to the present invention, and (B) an equivalent circuit thereof. Similar to the above, FIG.
There is a circuit board 22 on a housing 23 made of a conductor having a waveguide input part similar to that shown in FIG. 2, and the pickup probe 21 protected by an insulator 21b is inserted from the circuit board 22 through the housing 23. The input radio wave signal from the waveguide input section is converted from the waveguide mode to the coaxial mode and taken into the circuit board 22 to receive the input radio wave. A cylindrical concave portion 25 is formed on the outer peripheral portion of the pickup probe 21 below the circuit board 22 of the housing 23, and a cylindrical concave portion 26 is formed on the outer peripheral portion of the cylindrical concave portion 25. A value L2 obtained by subtracting the radius of the insulator 21b, which is the opening of the housing for the pickup probe of the housing, from the radius of the cylindrical shape 25 is assumed to be a quarter of the in-line wavelength λg of the input radio wave. Further, the depth L3 of the cylindrical shape 26 is also set to be a quarter of the in-line wavelength λg of the input radio wave. Further, the depth D of the cylindrical recess 25 and the thickness D of the cylinder of the cylindrical shape 26 are 10 of the in-line wavelength λg.
It is assumed to be 1/100 to 1/100, which is sufficiently smaller than λg. At this time, the equivalent circuit of the peripheral portion of the pickup probe is as shown in FIG. 7B, and the point e from the outer peripheral portion c of the opening of the housing for the pickup probe of the cylindrical concave portion 25 to the bottom point e of the cylindrical concave portion 26. The input impedance seen is equal to the λg / 2 line of which the tip is short-circuited, and the short-circuited state occurs. However, since the point d on the outer peripheral portion of the cylindrical portion 25 corresponds to the node of the current, even if the contact between the substrate 22 and the housing 23 is insufficient at this point, it does not affect the above operation.
【００１８】図４は、本発明によるＬＮＢの入力構造の
他の実施例の（Ａ）正面図、（Ｂ）側面断面図である。
フィードホーン入力部４４を持つ筐体４３の背後に回路
基板４２があり、ピックアップ手段４１によりピックア
ップ手段のための筐体４３の開口部４４ｂを通してフィ
ードホーン入力部４４に入力される入力電波信号を回路
基板４２に取り込んで受信する。4 (A) is a front view and FIG. 4 (B) is a side sectional view of another embodiment of the LNB input structure according to the present invention.
A circuit board 42 is provided behind a housing 43 having a feed horn input section 44, and a circuit for input radio signals input to the feed horn input section 44 by the pickup means 41 through an opening 44b of the housing 43 for the pickup means. It is received on the substrate 42 by being received.
【００１９】図５は、上記ピックアップ手段４１として
回路基板に形成したパターンを用いた実施例の主要部の
（Ａ）側面断面図、（Ｂ）背面図である。フィードホー
ン入力部を持つ筐体５３のピックアップ手段のための開
口部５４ｂを通して、筐体５３の背面に配置した回路基
板５２に形成したパターン５１により、フィードホーン
に入力した入力電波信号を回路基板５２に取り込んで受
信する。なお、パターン５１の背後には、ショート面５
７が配置してある。筐体５３の回路基板５２に接する面
に、上記と同様に、円柱形の凹部５５が形成してある。
円柱形５５の半径から開口部５４ｂの半径を差し引いた
値Ｌ１は、入力電波の線路内波長λｇの２分の１とす
る。FIG. 5 is a side sectional view (A) and a rear view (B) of a main part of an embodiment using a pattern formed on a circuit board as the pickup means 41. The pattern 51 formed on the circuit board 52 arranged on the back surface of the housing 53 passes through the opening 54b for the pickup means of the housing 53 having the feed horn input portion, and the input radio signal input to the feed horn is fed to the circuit board 52. And receive it. Behind the pattern 51, the short surface 5
7 is arranged. On the surface of the housing 53 that contacts the circuit board 52, a cylindrical recess 55 is formed, as in the above case.
A value L1 obtained by subtracting the radius of the opening 54b from the radius of the cylindrical shape 55 is set to one half of the in-line wavelength λg of the input radio wave.
【００２０】図６は、上記ピックアップ手段４１として
伝送線路で給電するスロットアンテナを用いた実施例の
主要部の（Ａ）側面断面図、（Ｂ）背面図である。フィ
ードホーン入力部を持つ筐体６３のピックアップ手段の
ための開口部６４ｂを通して、筐体６３の背面に配置し
た回路基板６２のグランド面に形成したスロット６１と
伝送線路６１ａにより、フィードホーンに入力した入力
電波信号を回路基板６２に取り込んで受信する。筐体６
３の回路基板６２に接する面に、上記と同様に、円柱形
の凹部６５が形成してある。円柱形６５の半径から開口
部６４ｂの半径を差し引いた値Ｌ１は、入力電波の線路
内波長λｇの２分の１とする。FIG. 6 is a side sectional view (A) and a rear view (B) of a main part of an embodiment using a slot antenna feeding by a transmission line as the pickup means 41. Input to the feed horn through a slot 61 and a transmission line 61a formed on a ground surface of a circuit board 62 arranged on the back surface of the housing 63 through an opening 64b for a pickup means of the housing 63 having a feed horn input portion. The input radio wave signal is received by the circuit board 62. Case 6
On the surface of the No. 3 contacting the circuit board 62, a cylindrical recess 65 is formed as in the above. A value L1 obtained by subtracting the radius of the opening 64b from the radius of the cylindrical shape 65 is set to half of the in-line wavelength λg of the input radio wave.
【００２１】図７は、上記ピックアップ手段４１として
伝送線路で給電するパッチアンテナを用いた実施例の主
要部の（Ａ）側面断面図、（Ｂ）背面図である。フィー
ドホーン入力部を持つ筐体７３のピックアップ手段のた
めの開口部７４ｂを通して、筐体７３の背面に配置した
回路基板７２のグランド面に形成したパッチ７１と伝送
線路７１ａにより、フィードホーンに入力した入力電波
信号を回路基板７２に取り込んで受信する。筐体７３の
回路基板７２に接する面に、上記と同様に、円柱形の凹
部７５が形成してある。円柱形７５の半径から開口部７
４ｂの半径を差し引いた値Ｌ１は、入力電波の線路内波
長λｇの２分の１とする。FIG. 7 is a side sectional view (A) and a rear view (B) of the main part of an embodiment using a patch antenna fed by a transmission line as the pickup means 41. Input to the feed horn is made through a patch 71 and a transmission line 71a formed on the ground surface of a circuit board 72 arranged on the back surface of the housing 73 through an opening 74b for a pickup means of the housing 73 having a feed horn input portion. The input radio signal is received by the circuit board 72. A cylindrical recess 75 is formed on the surface of the casing 73 that contacts the circuit board 72, as described above. From the radius of the cylindrical shape 75 to the opening 7
The value L1 obtained by subtracting the radius of 4b is one half of the in-line wavelength λg of the input radio wave.
【００２２】図８は、上記ピックアップ手段４１として
スロットで給電するパッチアンテナを用いた実施例の主
要部の（Ａ）側面断面図、（Ｂ）背面図である。フィー
ドホーン入力部を持つ筐体８３のピックアップ手段のた
めの開口部８４ｂを通して、筐体８３の背面に配置した
回路基板８２のグランド面に乗せた絶縁板８１ｃに形成
したパッチ８１とグランド面のスロット８１ｂと伝送線
路８１ａにより、フィードホーンに入力した入力電波信
号を回路基板８２に取り込んで受信する。筐体８３の回
路基板８２に接する面に、上記と同様に、円柱形の凹部
８５が形成してある。円柱形８５の半径から開口部８４
ｂの半径を差し引いた値Ｌ１は、入力電波の線路内波長
λｇの２分の１とする。FIG. 8 is a side sectional view (A) and a rear view (B) of a main part of an embodiment using a patch antenna feeding a slot as the pickup means 41. A patch 81 formed on an insulating plate 81c placed on a ground surface of a circuit board 82 arranged on the back surface of the housing 83 and a slot of the ground surface through an opening 84b for a pickup means of the housing 83 having a feed horn input portion. The input radio signal input to the feed horn is received by the circuit board 82 by 81b and the transmission line 81a. A cylindrical recess 85 is formed on the surface of the housing 83 that contacts the circuit board 82, as in the above case. From the radius of the cylindrical shape 85 to the opening 84
The value L1 obtained by subtracting the radius of b is set to one half of the in-line wavelength λg of the input radio wave.
【００２３】以上の実施例では、導波管入力部、フォー
ドホーン入力部、ピックアップ手段、チョーク構造など
の組合せは限定的に説明したが、本発明はこれに限らず
これらの間の他の組合せも上記と同様にして可能である
ことは当然である。また、上記実施例では、入力電波の
受信を想定して説明したが、本発明は受信に限らず送信
の場合も同様に適用できる。また、取り扱う電波は円偏
波であると直線偏波であるとを問わない。In the above embodiments, the combination of the waveguide input section, the Ford horn input section, the pickup means, the choke structure, etc. is limitedly described, but the present invention is not limited to this, and other combinations between them. Needless to say, it is possible in the same manner as above. Further, in the above-mentioned embodiment, the explanation was made on the assumption that the input radio wave is received, but the present invention is not limited to reception but can be similarly applied to the case of transmission. In addition, the radio waves handled may be circularly polarized waves or linearly polarized waves.
【００２４】[0024]
【発明の効果】以上説明してように、導波管入力部又は
フィードホーン入力部から入力された電波信号を回路基
板に取り込むピックアップ手段と導波管又はフィードホ
ーンの筐体との接触部にチョーク構造を設けることによ
り、同軸−導波管変換部からの電磁波の漏れによる損失
を無くし、ＬＮＢの雑音指数の劣化を防止できる。As described above, at the contact portion between the pickup means for taking the radio signal input from the waveguide input section or the feed horn input section into the circuit board and the waveguide or the feed horn housing. By providing the choke structure, loss due to leakage of electromagnetic waves from the coaxial-waveguide conversion unit can be eliminated, and deterioration of the noise figure of the LNB can be prevented.
【図１】本発明によるＬＮＢの入力構造の１実施例の
（Ａ）ピックアッププローブ周辺部の側面断面図、
（Ｂ）同等価回路である。FIG. 1 is a side sectional view of a pickup probe peripheral portion of an embodiment of an input structure of an LNB according to the present invention;
(B) The equivalent circuit.
【図２】本発明によるＬＮＢの入力構造の別の実施例の
（Ａ）ピックアッププローブ周辺部の側面断面図、
（Ｂ）同等価回路である。FIG. 2 is a side sectional view of (A) a pickup probe peripheral portion of another embodiment of the LNB input structure according to the present invention;
(B) The equivalent circuit.
【図３】ＬＮＢの入力構造の１例の（Ａ）正面図、
（Ｂ）側面断面図である。FIG. 3A is a front view of an example of an input structure of an LNB,
(B) It is a side sectional view.
【図４】本発明によるＬＮＢの入力構造の他の実施例の
（Ａ）正面図、（Ｂ）側面断面図である。4 (A) is a front view and FIG. 4 (B) is a side sectional view of another embodiment of the LNB input structure according to the present invention.
【図５】ピックアップ手段として回路基板に形成したパ
ターンを用いた実施例の主要部の（Ａ）側面断面図、
（Ｂ）背面図である。FIG. 5 is a side sectional view (A) of a main part of an embodiment using a pattern formed on a circuit board as a pickup means,
(B) It is a rear view.
【図６】ピックアップ手段として伝送線路で給電するス
ロットアンテナを用いた実施例の主要部の（Ａ）側面断
面図、（Ｂ）背面図である。FIG. 6 is a side sectional view (A) and a rear view (B) of a main part of an embodiment in which a slot antenna that feeds by a transmission line is used as a pickup means.
【図７】ピックアップ手段として伝送線路で給電するパ
ッチアンテナを用いた実施例の主要部の（Ａ）側面断面
図、（Ｂ）背面図である。7 (A) is a side sectional view and FIG. 7 (B) is a rear view of a main part of an embodiment using a patch antenna fed by a transmission line as a pickup means.
【図８】上記ピックアップ手段としてスロットで給電す
るパッチアンテナを用いた実施例の主要部の（Ａ）側面
断面図、（Ｂ）背面図である。FIG. 8 is a side sectional view (A) and a rear view (B) of a main part of an embodiment using a patch antenna that feeds power through a slot as the pickup means.
１ ピックアッププローブ １ｂ 絶縁体 ２ 回路基板 ３ 筐体 ５ 円柱形の凹部 ２１ ピックアッププローブ ２１ｂ 絶縁体 ２２ 回路基板 ２３ 筐体 ２５ 円柱形の凹部 ２６ 円筒形の凹部 ３１ ピックアッププローブ ３１ｂ 絶縁体 ３２ 回路基板 ３３ 筐体 ３４ 導波管入力部 ４１ ピックアップ手段 ４２ 回路基板 ４３ 筐体 ４４ フィードホーン入力部 ５１ パターン ５２ 回路基板 ５３ 筐体 ５４ｂ 筐体開口部 ５５ 円柱形の凹部 ５７ ショート面 ６１ スロット ６１ｂ 伝送線路 ６２ 回路基板 ６３ 筐体 ６４ｂ 筐体開口部 ６５ 円柱形の凹部 ７１ パッチ ７１ａ 伝送線路 ７２ 回路基板 ７３ 筐体 ７４ｂ 筐体開口部 ７５ 円柱形の凹部 ８１ パッチ ８１ａ 伝送線路 ８１ｂ スロット ８１ｃ 絶縁板 ８２ 回路基板 ８３ 筐体 ８４ｂ 筐体開口部 ８５ 円柱形の凹部 1 Pick-up probe 1b Insulator 2 Circuit board 3 Case 5 Cylindrical recess 21 Pick-up probe 21b Insulator 22 Circuit board 23 Casing 25 Cylindrical recess 26 Cylindrical recess 31 Pick-up probe 31b Insulator 32 Circuit board 33 Casing Body 34 Waveguide input section 41 Pickup means 42 Circuit board 43 Housing 44 Feed horn input section 51 Pattern 52 Circuit board 53 Housing 54b Housing opening 55 Cylindrical recess 57 Short surface 61 Slot 61b Transmission line 62 Circuit board 63 housing 64b housing opening 65 cylindrical recess 71 patch 71a transmission line 72 circuit board 73 housing 74b housing opening 75 cylindrical recess 81 patch 81a transmission line 81b slot 81c insulating plate 82 circuit board 83 housing 84b housing opening 8 The recess of the cylindrical
Claims (10)
力部を持つ筐体と、入力電波信号のピックアップ手段を
備え、同導波管入力部若しくはフィードホーン入力部か
ら入力された電波信号を回路基板に取り込むＬＮＢ（ロ
ーノイズブロックダウンコンバータ）において、ピック
アップ手段と前記筐体の接触部にチョーク構造を設ける
ことにより入力部の損失を低減させることを特徴とした
ＬＮＢの入力構造。1. A circuit board comprising: a housing having a waveguide input section or a feed horn input section; and an input radio wave signal pickup means, and a radio wave signal inputted from the waveguide input section or the feed horn input section. In the LNB (low noise block down converter) to be taken into, the input structure of the LNB is characterized by reducing the loss of the input part by providing a choke structure at the contact part between the pickup means and the casing.
るチョーク構造は、筐体と回路基板間に形成したピック
アップ手段の中心を中心とする円柱形の凹部とすること
を特徴とした請求項１記載のＬＮＢの入力構造。2. The choke structure provided at the contact portion between the pickup means and the housing is a cylindrical recess centered on the center of the pickup means formed between the housing and the circuit board. Input structure of the described LNB.
プ手段のための開口部の半径を差し引いた値は、入力電
波信号の線路内波長の２分の１とし、かつ、同円柱形の
深さは入力電波信号の線路内波長の１０分の１から１０
０分の１程度とすることを特徴とした請求項２記載のＬ
ＮＢの入力構造。3. A value obtained by subtracting the radius of the opening for the pick-up means of the housing from the radius of the cylindrical shape is one half of the in-line wavelength of the input radio signal and the depth of the cylindrical shape. Is 1/10 to 10 of the wavelength of the input radio signal in the line
The L according to claim 2, which is about 1/0.
Input structure of NB.
るチョーク構造は、筐体と回路基板間に形成したピック
アップ手段の中心を中心とする円柱形の凹部と同円柱形
の外周部に形成した円筒形の凹部とすることを特徴とし
た請求項１記載のＬＮＢの入力構造。4. The choke structure provided at the contact portion between the pickup means and the casing is formed in a cylindrical concave portion centered on the center of the pickup means formed between the casing and the circuit board and in the same cylindrical outer peripheral portion. The LNB input structure according to claim 1, wherein the input structure is a cylindrical recess.
プ手段のための開口部の半径を差し引いた値及び円筒形
の回路基板面からの深さは、入力電波信号の線路内波長
の４分の１とし、かつ、円柱形の深さと円筒形の筒の厚
さは、入力電波信号の波長の１０分の１から１００分の
１程度とすることを特徴とした請求項２記載のＬＮＢの
入力構造。5. The value obtained by subtracting the radius of the opening for the pick-up means of the casing from the radius of the cylindrical shape and the depth from the surface of the cylindrical circuit board are 4 minutes of the in-line wavelength of the input radio signal. 3. The LNB according to claim 2, wherein the depth of the cylindrical shape and the thickness of the cylindrical shape are about 1/10 to 1/100 of the wavelength of the input radio signal. Input structure.
の導波管入力部に挿入したピックアッププローブとする
ことを特徴とした請求項１、請求項２、請求項３、請求
項４又は請求項５記載のＬＮＢの入力構造。6. The pickup probe as claimed in claim 1, wherein the pickup means is a pickup probe inserted from a circuit board into a waveguide input portion of a housing. The input structure of LNB described in 5.
たパターンとすることを特徴とした請求項１、請求項
２、請求項３、請求項４又は請求項５記載のＬＮＢの入
力構造。7. The LNB input structure according to claim 1, 2, 3, 4, or 5, wherein the pickup means is a pattern formed on a circuit board.
るスロットアンテナとすることを特徴とした請求項１、
請求項２、請求項３、請求項４又は請求項５記載のＬＮ
Ｂの入力構造。8. The pick-up means is a slot antenna fed by a transmission line.
LN according to claim 2, claim 3, claim 4 or claim 5
Input structure of B.
るパッチアンテナとすることを特徴とした請求項１、請
求項２、請求項３、請求項４又は請求項５記載のＬＮＢ
の入力構造。9. The LNB according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the pickup means is a patch antenna that is fed by a transmission line.
Input structure.
するパッチアンテナとすることを特徴とした請求項１、
請求項２、請求項３、請求項４又は請求項５記載のＬＮ
Ｂの入力構造。10. The pick-up means is a patch antenna that feeds power through a slot.
LN according to claim 2, claim 3, claim 4 or claim 5
Input structure of B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30112095A JPH09148808A (en) | 1995-11-20 | 1995-11-20 | Input structure of lnb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30112095A JPH09148808A (en) | 1995-11-20 | 1995-11-20 | Input structure of lnb |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09148808A true JPH09148808A (en) | 1997-06-06 |
Family
ID=17893077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30112095A Pending JPH09148808A (en) | 1995-11-20 | 1995-11-20 | Input structure of lnb |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09148808A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10303615A (en) * | 1997-04-25 | 1998-11-13 | Kyocera Corp | High frequency package and its connection structure |
| US6111474A (en) * | 1997-11-27 | 2000-08-29 | Sharp Kabushiki Kaisha | Low-noise amplifying device |
| JP2003218627A (en) * | 2002-01-28 | 2003-07-31 | Nef:Kk | Waveguide antenna |
| JP2005312068A (en) * | 2005-05-11 | 2005-11-04 | Toshiba Corp | Microwave module |
| JP2007228359A (en) * | 2006-02-24 | 2007-09-06 | Kyocera Corp | Aperture antenna |
| JP2007235235A (en) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | Aperture antenna |
| JP2007235234A (en) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | Aperture antenna |
| JP2007266835A (en) * | 2006-03-28 | 2007-10-11 | Kyocera Corp | Aperture antenna |
| WO2010023827A1 (en) * | 2008-08-29 | 2010-03-04 | 日本電気株式会社 | Waveguide, waveguide connection structure, and waveguide connection method |
| JP2013141251A (en) * | 2012-01-03 | 2013-07-18 | Universita Degli Studi Roma Tore | Low noise index aperture antenna |
-
1995
- 1995-11-20 JP JP30112095A patent/JPH09148808A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10303615A (en) * | 1997-04-25 | 1998-11-13 | Kyocera Corp | High frequency package and its connection structure |
| US6111474A (en) * | 1997-11-27 | 2000-08-29 | Sharp Kabushiki Kaisha | Low-noise amplifying device |
| JP2003218627A (en) * | 2002-01-28 | 2003-07-31 | Nef:Kk | Waveguide antenna |
| JP4580815B2 (en) * | 2005-05-11 | 2010-11-17 | 株式会社東芝 | Microwave module |
| JP2005312068A (en) * | 2005-05-11 | 2005-11-04 | Toshiba Corp | Microwave module |
| JP2007228359A (en) * | 2006-02-24 | 2007-09-06 | Kyocera Corp | Aperture antenna |
| JP4713367B2 (en) * | 2006-02-24 | 2011-06-29 | 京セラ株式会社 | Aperture antenna |
| JP2007235235A (en) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | Aperture antenna |
| JP2007235234A (en) * | 2006-02-27 | 2007-09-13 | Kyocera Corp | Aperture antenna |
| JP2007266835A (en) * | 2006-03-28 | 2007-10-11 | Kyocera Corp | Aperture antenna |
| WO2010023827A1 (en) * | 2008-08-29 | 2010-03-04 | 日本電気株式会社 | Waveguide, waveguide connection structure, and waveguide connection method |
| US8680954B2 (en) | 2008-08-29 | 2014-03-25 | Nec Corporation | Waveguide, waveguide connection structure and waveguide connection method |
| JP2013141251A (en) * | 2012-01-03 | 2013-07-18 | Universita Degli Studi Roma Tore | Low noise index aperture antenna |
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