JPH07231206A - Waveguide trap structure for lnb - Google Patents
Waveguide trap structure for lnbInfo
- Publication number
- JPH07231206A JPH07231206A JP2099294A JP2099294A JPH07231206A JP H07231206 A JPH07231206 A JP H07231206A JP 2099294 A JP2099294 A JP 2099294A JP 2099294 A JP2099294 A JP 2099294A JP H07231206 A JPH07231206 A JP H07231206A
- Authority
- JP
- Japan
- Prior art keywords
- waveguide
- rivet
- lnb
- trap
- hole
- 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
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば衛星放送受信用
のＬＮＢ（ローノイズブロックコンバータ）におけるＬ
ＮＢ用導波管トラップ構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LNB (low noise block converter) for receiving satellite broadcasting, for example.
The present invention relates to a waveguide trap structure for NB.
【０００２】[0002]
【従来の技術】衛星放送受信用のＬＮＢは、一般に図４
に示すように構成されている。同図において、１はアン
テナ受信信号を伝送するＬＮＢ用導波管で、この導波管
１からは入力プローブ２により信号が取り出される。そ
して、この入力プローブ２により取り出された信号は、
ＲＦ（高周波）アンプ３で増幅された後、バンドパスフ
ィルタ４を介してミキサ５に入力される。また、このミ
キサ５には、局部発振器６が接続される。このミキサ５
は、バンドパスフィルタ４からの信号と局部発振器６か
らの信号を混合する。そして、このミキサ５により混合
された信号がＩＦアンプ７により増幅されて出力され
る。2. Description of the Related Art LNBs for receiving satellite broadcasts are generally shown in FIG.
It is configured as shown in. In FIG. 1, reference numeral 1 is a LNB waveguide for transmitting an antenna reception signal, and a signal is taken out from the waveguide 1 by an input probe 2. Then, the signal extracted by this input probe 2 is
After being amplified by the RF (high frequency) amplifier 3, it is input to the mixer 5 via the bandpass filter 4. A local oscillator 6 is connected to the mixer 5. This mixer 5
Mixes the signal from the bandpass filter 4 with the signal from the local oscillator 6. Then, the signal mixed by the mixer 5 is amplified by the IF amplifier 7 and output.
【０００３】上記構成のＬＮＢにおいては、局部発振器
６からの信号がＬＮＢ用導波管１から不要放射されるの
を防止するため、導波管１にトラップを設けている。即
ち、従来では図５に示すように導波管１の底面にネジ穴
８を設け、このネジ穴８に調節ネジ９を挿入し、トラッ
プの周波数が所望の周波数となるように調節ネジ９を調
節している。この場合、調節ネジ９が導波管１の電界面
（Ｅ面）に平行になるように、ネジ穴８の位置が設定さ
れる。In the LNB having the above-mentioned structure, a trap is provided in the waveguide 1 in order to prevent unnecessary emission of the signal from the local oscillator 6 from the LNB waveguide 1. That is, conventionally, a screw hole 8 is provided on the bottom surface of the waveguide 1 as shown in FIG. 5, and an adjusting screw 9 is inserted into the screw hole 8 to adjust the trap frequency to a desired frequency. I am adjusting. In this case, the position of the screw hole 8 is set so that the adjusting screw 9 is parallel to the electric field surface (E surface) of the waveguide 1.
【０００４】[0004]
【発明が解決しようとする課題】上記従来のＬＮＢのよ
うに導波管１に設けたネジ穴８内に調節ネジ９を回転し
て挿入するようにした場合、調節ネジ９がネジ穴８に部
分的に接触してアースされることになる。しかし、調節
ネジ９を回転させると、その位置によって調節ネジ９と
ネジ穴８との接触状態が変化し、アースの状態が一定と
ならない。When the adjusting screw 9 is rotated and inserted into the screw hole 8 provided in the waveguide 1 as in the conventional LNB, the adjusting screw 9 is inserted into the screw hole 8. Partially touched and grounded. However, when the adjusting screw 9 is rotated, the contact state between the adjusting screw 9 and the screw hole 8 changes depending on its position, and the ground state is not constant.
【０００５】即ち、調節ネジ９を回転してネジ穴８内に
挿入するということは、ネジ穴８は調節ネジ９の径より
も大きくしなければならず、従って、ネジ穴８と調節ネ
ジ９との間に隙間を生じる。この隙間があると、調節ネ
ジ９は多少なりともぐらつきを生じ、回転に伴ってネジ
穴８と接触する個所が常に変化し、アース状態が一定と
ならない。この結果、調節ネジ９を導波管１内の同じ位
置まで挿入したとしても、各ＬＮＢ毎にアース状態が変
化してトラップの周波数にずれを生じる。That is, the fact that the adjusting screw 9 is rotated and inserted into the screw hole 8 means that the screw hole 8 must be larger than the diameter of the adjusting screw 9, and therefore, the screw hole 8 and the adjusting screw 9 must be made larger. Creates a gap between and. If there is this gap, the adjusting screw 9 wobbles to some extent, and the portion that comes into contact with the screw hole 8 constantly changes with rotation, and the grounded state is not constant. As a result, even if the adjusting screw 9 is inserted to the same position in the waveguide 1, the ground state changes for each LNB and the trap frequency shifts.
【０００６】このため従来では、導波管１の通過特性あ
るいは不要放射などを測定しながら、所定のトラップ周
波数となるように調節ネジ９を回して調節しなければな
らず、その調節操作が非常に面倒であった。For this reason, conventionally, it has been necessary to rotate the adjusting screw 9 so as to obtain a predetermined trap frequency while measuring the pass characteristic of the waveguide 1 or unnecessary radiation, and the adjusting operation is extremely difficult. It was troublesome.
【０００７】また、従来では、導波管１の底面に設けた
調節ネジ９により、トラップの周波数を調節しているの
で、導波管１の底面にＬＮＢ回路基板を直接配置するこ
とができず、無駄なスペースを生じて小型化を図る上で
障害となっている。Further, conventionally, since the frequency of the trap is adjusted by the adjusting screw 9 provided on the bottom surface of the waveguide 1, the LNB circuit board cannot be directly arranged on the bottom surface of the waveguide 1. However, this is an obstacle to reducing the size by creating a wasted space.
【０００８】本発明は上記実情に鑑みてなされたもの
で、トラップの周波数を無調整で所望の周波数に設定で
きると共に、無駄なスペースを無くして小型化を図り得
るＬＮＢ用導波管トラップ構造を提供することを目的と
する。The present invention has been made in view of the above circumstances, and provides a waveguide trap structure for an LNB that can set the trap frequency to a desired frequency without adjustment and can reduce the size without wasteful space. The purpose is to provide.
【０００９】[0009]
【課題を解決するための手段】本発明に係るＬＮＢ用導
波管トラップ構造は、ＬＮＢ用導波管の一面にリベット
装着用透孔を設け、この透孔より該導波管の電界面に平
行になるようにトラップ形成用リベットを圧入して固着
することを特徴とする。In the waveguide trap structure for LNB according to the present invention, a rivet mounting through hole is provided on one surface of the LNB waveguide, and the through hole is provided on the electric field surface of the waveguide. It is characterized in that the rivet for trap formation is press-fitted and fixed so as to be parallel.
【００１０】[0010]
【作用】上記のように導波管に設けたリベット装着用透
孔にリベットを圧入することにより、リベットと導波管
との電気的接続状態を一定にでき、導波管のアース状態
が一定となって特性のバラツキがなくなる。この結果、
最初にリベットの位置、径、長さを設定し、トラップの
周波数を所望の周波数に一致させることにより、無調整
で所定の周波数特性が得られる。By press-fitting the rivet into the rivet mounting through hole provided in the waveguide as described above, the electrical connection between the rivet and the waveguide can be made uniform, and the grounded state of the waveguide can be made uniform. Therefore, there is no variation in characteristics. As a result,
First, the position, diameter, and length of the rivet are set, and the frequency of the trap is made to match the desired frequency, whereby a predetermined frequency characteristic can be obtained without adjustment.
【００１１】また、リベットの調節が不要となるため、
リベットの頭部が位置する導波管の底部にＬＮＢ回路基
板を配置でき、無駄なスペースを無くしてＬＮＢの小型
化が可能となる。Further, since the rivet need not be adjusted,
The LNB circuit board can be arranged at the bottom of the waveguide where the head of the rivet is located, and it is possible to reduce the size of the LNB by eliminating unnecessary space.
【００１２】[0012]
【実施例】以下、図面を参照して本発明の一実施例を説
明する。図１は本発明の一実施例に係るＬＮＢの全体構
成を示す外観斜視図、図２（ａ）はＬＮＢ用導波管を開
口面側から見た正面図、図２（ｂ）は同導波管の側断面
図、図２（ｃ）は同実施例で使用するトラップ用リベッ
トの正面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view showing the overall configuration of an LNB according to an embodiment of the present invention, FIG. 2 (a) is a front view of an LNB waveguide seen from the opening side, and FIG. FIG. 2C is a side sectional view of the wave tube, and is a front view of the trap rivet used in the same embodiment.
【００１３】図１において、１０は例えばアルミニウム
を用いて構成したＬＮＢの筐体で、その内側に導波管１
１が形成される。また、筐体１０内には、後述するよう
にＬＮＢ回路基板が設けられる。In FIG. 1, reference numeral 10 denotes an LNB casing made of aluminum, for example, and a waveguide 1 is provided inside the casing.
1 is formed. In addition, an LNB circuit board is provided in the housing 10 as described later.
【００１４】上記ＬＮＢ用導波管１１には、詳細を図２
に示すように上面に入力プローブ１２が貫通して設けら
れと共に、底面にリベット装着用透孔１３が設けられ
る。このリベット装着用透孔１３は、外側に面している
部分の径が大きく形成されている。The details of the LNB waveguide 11 are shown in FIG.
As shown in FIG. 3, the input probe 12 is provided so as to penetrate therethrough, and the rivet mounting through hole 13 is provided at the bottom surface. The rivet mounting through hole 13 has a large diameter in the portion facing the outside.
【００１５】そして、このリベット装着用透孔１３に
は、図２（ｃ）に示す例えばアルミニウム製のトラップ
用リベット１４が圧入される。上記導波管１１は、上下
方向に電界が発生しており、その電界面にリベット１４
が平行になるように、リベット装着用透孔１３の位置が
設定される。上記リベット１４は、リベット装着用透孔
１３と同じ形状を有する係合部１４ａと、その先端に形
成されたトラップ部１４ｂからなっている。このトラッ
プ部１４ｂは、係合部１４ａより小径に形成される。係
合部１４ａは、リベット装着用透孔１３の径と同じか僅
かに大径に形成されており、リベット装着用透孔１３内
に圧入されることによって導波管１１に固着される。ま
た、係合部１４ａは、リベット装着用透孔１３とほぼ同
じ長さを有しており、リベット装着用透孔１３に圧入し
て固着した際に、トラップ部１４ｂが導波管１１内に挿
入されるようになっている。この導波管１１内に挿入さ
れるトラップ部１４ｂの位置、太さ（径）、長さによっ
てトラップ周波数が決定される。Then, a trap rivet 14 made of, for example, aluminum as shown in FIG. 2C is press-fitted into the rivet mounting through hole 13. The waveguide 11 generates an electric field in the vertical direction, and the rivet 14 is attached to the electric field surface.
The positions of the through holes 13 for rivet mounting are set so that they are parallel to each other. The rivet 14 includes an engaging portion 14a having the same shape as the rivet mounting through hole 13 and a trap portion 14b formed at the tip thereof. The trap portion 14b has a smaller diameter than the engaging portion 14a. The engaging portion 14a is formed to have the same diameter as or slightly larger than the diameter of the rivet mounting through hole 13, and is fixed to the waveguide 11 by being press-fitted into the rivet mounting through hole 13. The engaging portion 14a has substantially the same length as the rivet-mounting through hole 13, and when the rivet-mounting through-hole 13 is press-fitted and fixed, the trap portion 14b is inserted into the waveguide 11. It is supposed to be inserted. The trap frequency is determined by the position, thickness (diameter), and length of the trap portion 14b inserted in the waveguide 11.
【００１６】そして、リベット１４の装着後、導波管１
１の底面にＬＮＢ回路基板１５がネジ等により装着され
る。この基板１５には、図４に示したＲＦアンプ３、バ
ンドパスフィルタ４、ミキサ５、局部発振器６、ＩＦア
ンプ７等が設けられる。After mounting the rivet 14, the waveguide 1
The LNB circuit board 15 is attached to the bottom surface of the device 1 with screws or the like. The substrate 15 is provided with the RF amplifier 3, the bandpass filter 4, the mixer 5, the local oscillator 6, the IF amplifier 7 and the like shown in FIG.
【００１７】上記のようにリベット１４を導波管１１に
設けたリベット装着用透孔１３に圧入することにより、
リベット１４の圧入状態が一定となり、それにより係合
部１４ａと導波管１１との電気的接続状態、即ちアース
が一定となって特性のバラツキがなくなる。この結果、
最初にリベット１４のトラップ部１４ｂの位置、径、長
さを設定し、図３の周波数特性に示すようにトラップの
周波数ｆ1 を所望の周波数（局部発振器６の発振周波
数）に一致させると、無調整で所定の特性が得られる。By pressing the rivet 14 into the rivet mounting through hole 13 provided in the waveguide 11 as described above,
The press-fitted state of the rivet 14 becomes constant, whereby the electrical connection state between the engaging portion 14a and the waveguide 11, that is, the ground is made constant, and the variation in characteristics is eliminated. As a result,
First, the position, diameter, and length of the trap portion 14b of the rivet 14 are set, and the trap frequency f1 is made equal to the desired frequency (oscillation frequency of the local oscillator 6) as shown in the frequency characteristic of FIG. The adjustment provides the desired characteristics.
【００１８】また、リベット１４の調節が不要となるた
め、リベット１４の頭部が位置する導波管１１の底部に
ＬＮＢ回路基板１５を配置することが可能となり、無駄
なスペースを無くしてＬＮＢの小型化を図ることができ
る。Since the rivet 14 does not need to be adjusted, the LNB circuit board 15 can be arranged at the bottom of the waveguide 11 where the head of the rivet 14 is located, eliminating wasteful space and eliminating the LNB. The size can be reduced.
【００１９】[0019]
【発明の効果】以上詳記したように本発明によれば、導
波管に設けたリベット装着用透孔にリベットを圧入して
固着するようにしたので、リベットと導波管との電気的
接続状態が一定となって特性のバラツキがなくなり、無
調整でトラップの周波数を所望の周波数に一致させるこ
とができる。また、リベットの調節が不要となるため、
リベットの頭部が位置する導波管の底部にＬＮＢ回路基
板を配置してスペースの有効利用が可能となり、ＬＮＢ
の小型化を図ることができる。As described above in detail, according to the present invention, since the rivet is press-fitted and fixed in the through hole for rivet mounting provided in the waveguide, electrical connection between the rivet and the waveguide is achieved. The connection state becomes constant, and there is no variation in characteristics, and the trap frequency can be made to match the desired frequency without adjustment. Also, since there is no need to adjust rivets,
By arranging the LNB circuit board on the bottom of the waveguide where the head of the rivet is located, it becomes possible to effectively use the space.
Can be miniaturized.
【図１】本発明の一実施例に係る衛星放送受信用ＬＮＢ
の全体構成を示す斜視図。FIG. 1 is a satellite broadcast receiving LNB according to an embodiment of the present invention.
The perspective view which shows the whole structure of.
【図２】（ａ）は同実施例におけるＬＮＢ用導波管を開
口面側から見た正面図、（ｂ）は同導波管の側断面図、
（ｃ）はトラップ用リベットの正面図。FIG. 2A is a front view of the LNB waveguide seen from the opening side in the embodiment, and FIG. 2B is a side sectional view of the waveguide.
(C) is a front view of the rivet for traps.
【図３】同実施例におけるＬＮＢの周波数特性図。FIG. 3 is a frequency characteristic diagram of the LNB in the example.
【図４】衛星放送受信用ＬＮＢの構成を示すブロック
図。FIG. 4 is a block diagram showing a configuration of a satellite broadcast receiving LNB.
【図５】（ａ）は従来のＬＮＢ用導波管を開口面側から
見た正面図、（ｂ）は同導波管の側断面図。FIG. 5A is a front view of a conventional LNB waveguide viewed from the opening side, and FIG. 5B is a side sectional view of the waveguide.
１０ ＬＮＢの筐体 １１ 導波管 １２ 入力プローブ １３ リベット装着用透孔 １４ リベット １４ａ 係合部 １４ｂ トラップ部 １５ ＬＮＢ回路基板 10 LNB Housing 11 Waveguide 12 Input Probe 13 Rivet Mounting Through Hole 14 Rivet 14a Engagement Part 14b Trap Part 15 LNB Circuit Board
───────────────────────────────────────────────────── フロントページの続き (72)発明者 萩原 修二 埼玉県大宮市蓮沼1406番地 八木アンテナ 株式会社大宮工場内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shuji Hagiwara 1406 Hasunuma, Omiya-shi, Saitama Yagi Antenna Co., Ltd. Omiya factory
Claims (1)
透孔を設け、この透孔より該導波管の電界面に平行にな
るようにトラップ形成用リベットを圧入して固着するこ
とを特徴とするＬＮＢ用導波管トラップ構造。1. A through hole for rivet mounting is provided on one surface of a waveguide for LNB, and a rivet for forming a trap is press-fitted and fixed through the through hole so as to be parallel to an electric field surface of the waveguide. A characteristic LNB waveguide trap structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6020992A JP2709265B2 (en) | 1994-02-18 | 1994-02-18 | Waveguide trap structure for LNB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6020992A JP2709265B2 (en) | 1994-02-18 | 1994-02-18 | Waveguide trap structure for LNB |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07231206A true JPH07231206A (en) | 1995-08-29 |
| JP2709265B2 JP2709265B2 (en) | 1998-02-04 |
Family
ID=12042629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6020992A Expired - Fee Related JP2709265B2 (en) | 1994-02-18 | 1994-02-18 | Waveguide trap structure for LNB |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2709265B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01133801U (en) * | 1988-03-07 | 1989-09-12 | ||
| JPH04291801A (en) * | 1991-03-20 | 1992-10-15 | Fujitsu Ltd | Waveguide filter |
-
1994
- 1994-02-18 JP JP6020992A patent/JP2709265B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01133801U (en) * | 1988-03-07 | 1989-09-12 | ||
| JPH04291801A (en) * | 1991-03-20 | 1992-10-15 | Fujitsu Ltd | Waveguide filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2709265B2 (en) | 1998-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |