JPH05243813A - Band pass filter - Google Patents
Band pass filterInfo
- Publication number
- JPH05243813A JPH05243813A JP7303592A JP7303592A JPH05243813A JP H05243813 A JPH05243813 A JP H05243813A JP 7303592 A JP7303592 A JP 7303592A JP 7303592 A JP7303592 A JP 7303592A JP H05243813 A JPH05243813 A JP H05243813A
- Authority
- JP
- Japan
- Prior art keywords
- waveguide
- pass filter
- band pass
- width
- providing
- 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
- 230000005540 biological transmission Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 244000292411 Excoecaria agallocha Species 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は帯域通過フィルタに関
し、特にマイクロ波帯やミリ波帯に使用される導波管型
の帯域通過フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bandpass filter, and more particularly to a waveguide type bandpass filter used in a microwave band and a millimeter wave band.
【０００２】[0002]
【従来の技術】従来の導波管型フィルタの一例を図７及
び図８に示す。図７は斜視図、図８はそのＢ−Ｂ線断面
図である。これらの図において、４０Ａは帯域通過フィ
ルタ、４１は高域通過フィルタであり、帯域通過フィル
タ４０Ａは導波管内に複数のリアクタンス素子３〜１２
を設けてある。２０，２１は標準導波管開口部である。
このようにリアクタンス素子を用いることにより導波管
型における帯域通過フィルタが得られるということは既
知である。（参考文型：「MICROWAVES FILTERS,IMPEDAN
CE-MATCHING NETWORKS,AND COUPLING STRUCTURES」GEOR
GE L.MATTHAE I MC GRAW-HILL BOOK COMPANY）又、導波
管の幅を標準導波管開口部より一様に段差を設けて狭め
ることにより高域通過特性が得られることも既知であ
る。（参考文献：同上）2. Description of the Related Art An example of a conventional waveguide type filter is shown in FIGS. 7 is a perspective view, and FIG. 8 is a sectional view taken along line BB. In these figures, 40A is a band pass filter, 41 is a high pass filter, and the band pass filter 40A is a plurality of reactance elements 3 to 12 in the waveguide.
Is provided. Reference numerals 20 and 21 are standard waveguide openings.
It is known that a waveguide type bandpass filter can be obtained by using a reactance element in this way. (Reference sentence: "MICROWAVES FILTERS, IMPEDAN
CE-MATCHING NETWORKS, AND COUPLING STRUCTURES "GEOR
GE L.MATTHAE IM C GRAW-HILL BOOK COMPANY) It is also known that high-pass characteristics can be obtained by narrowing the width of the waveguide with a uniform step from the standard waveguide opening. (Reference: Same as above)
【０００３】前記した帯域通過フィルタ４０Ａにおいて
は、図３の実線で示す帯域通過フィルタの伝送特性３０
を有しており、ここで低域側の減衰量を大きくとる必要
がある場合においては、図７及び図８に示すように帯域
通過フィルタ４０Ａと高域通過フィルタ４１を組み合わ
せて使用している。In the above bandpass filter 40A, the transmission characteristic 30 of the bandpass filter shown by the solid line in FIG.
When it is necessary to increase the amount of attenuation on the low frequency side, a band pass filter 40A and a high pass filter 41 are used in combination as shown in FIGS. 7 and 8. .
【０００４】[0004]
【発明が解決しようとする課題】このような従来の導波
管型の帯域通過フィルタを例えば受信信号と受信信号よ
り低い周波数の送信信号を分離する送受信分波器に適用
する場合には、図６の様に帯域通過フィルタを受信フィ
ルタ５０、送信フィルタ５１として構成する。この場
合、送信端５５の送信信号電力ＰT が、受信端５４の受
信信号電力ＰR に干渉するのを防止するためには、受信
フィルタ５０は送信信号周波数において，ＰT −ＰR 以
上の減衰量が必要となる。When the conventional waveguide type band pass filter is applied to, for example, a transmission / reception demultiplexer for separating a reception signal and a transmission signal of a frequency lower than the reception signal, As in 6, the band pass filter is configured as the reception filter 50 and the transmission filter 51. In this case, in order to prevent the transmission signal power P T of the transmission end 55 from interfering with the reception signal power P R of the reception end 54, the reception filter 50 has a transmission signal frequency of P T -P R or more. Attenuation is required.
【０００５】そこで、従来では、受信フィルタ５０は段
数を多くするか、図７，図８に示したように高域通過フ
ィルタと組み合わせて構成していたが、その場合におい
ても受信フィルタ５０はＰT −ＰR 以上の減衰量を確保
するには、通過損失が多くなり雑音レベルの増加及び全
体の形状の大型化，重量の増加そして電気調整が困難で
あるという問題が生じる。本発明の目的は、ＰT −ＰR
以上の減衰量の確保を容易にして通過損失を少なくすべ
く、高域通過フィルタの特性を備えて周波数の低域での
減衰量を増加させ、かつ形状を小型化し、重量が軽減で
きる導波管型の帯域通過フィルタを提供することにあ
る。Therefore, in the past, the receiving filter 50 was constructed by increasing the number of stages or by combining it with a high-pass filter as shown in FIGS. 7 and 8, but even in that case, the receiving filter 50 is P In order to secure the attenuation amount of T- P R or more, there arises a problem that the passage loss increases, the noise level increases, the size of the entire shape increases, the weight increases, and electrical adjustment is difficult. The object of the present invention is to provide P T -P R
In order to easily secure the above attenuation amount and reduce the passage loss, the characteristics of a high-pass filter are provided to increase the attenuation amount in the low frequency range, reduce the shape, and reduce the weight. It is to provide a tubular bandpass filter.
【０００６】[0006]
【課題を解決するための手段】本発明は、導波管内にリ
アクタンス素子を設けて構成される帯域通過フィルタに
おける、導波管内の磁界方向の幅を標準導波管開口部よ
り一様に段差を設けて狭め、かつその間に入出力整合回
路を備えた構成とする。この場合、導波管内の磁界方向
の幅を段階的或いはテーパ状に変化させてもよい。SUMMARY OF THE INVENTION According to the present invention, in a bandpass filter constituted by providing a reactance element in a waveguide, the width in the magnetic field direction in the waveguide is made to have a uniform step from the standard waveguide opening. Is provided and narrowed, and an input / output matching circuit is provided between them. In this case, the width in the magnetic field direction in the waveguide may be changed stepwise or tapered.
【０００７】[0007]
【実施例】次に、本発明について図面を参照して説明す
る。図１及び図２は、それぞれ本発明の一実施例の外観
斜視図，Ａ−Ａ断面図である。これらの図において、４
０は導波管型の帯域通過フィルタ部であり、その標準導
波管開口部２０，２１にはそれぞれ入出力整合回路１，
２が設けられる。又、帯域通過フィルタ部４０内には複
数のリアクタンス素子３〜１２が設けられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 and 2 are an external perspective view and an AA sectional view of an embodiment of the present invention, respectively. In these figures, 4
Reference numeral 0 denotes a waveguide type band pass filter portion, and the standard waveguide opening portions 20 and 21 thereof respectively have an input / output matching circuit 1,
Two are provided. Further, a plurality of reactance elements 3 to 12 are provided in the bandpass filter section 40.
【０００８】ここで、帯域通過フィルタを構成する導波
管の磁界方向幅を標準導波管開口部２０，２１の幅ａよ
り一様に狭めた幅ｂにし、導波管内を伝送する電磁波の
しゃ断周波数を高くする事により、高域通過フィルタの
機能をもたせ、低域における減衰量を図３の破線の帯域
通過フィルタの伝送特性３１の様に増加させる。これに
より、周波数ｆT における減衰量は（Ａ2 −Ａ1 ）分増
加させられる。この（Ａ2 −Ａ1 ）の増加分は導波管幅
を狭めた事により得られる。尚、開口幅ｂと開口幅ａと
の整合は、入出力整合回路１，２によって行われる。Here, the width of the waveguide forming the bandpass filter in the magnetic field direction is set to a width b which is narrower than the width a of the standard waveguide openings 20 and 21, and the electromagnetic wave transmitted in the waveguide is By increasing the cutoff frequency, the function of the high-pass filter is provided, and the attenuation amount in the low band is increased as shown by the transmission characteristic 31 of the band-pass filter of the broken line in FIG. As a result, the amount of attenuation at the frequency f T is increased by (A 2 −A 1 ). This increase in (A 2 −A 1 ) is obtained by narrowing the waveguide width. The matching between the opening width b and the opening width a is performed by the input / output matching circuits 1 and 2.
【０００９】このような帯域通過フィルタを、例えば、
図６に示したように、受信信号と、受信信号より低い周
波数の送信信号とを分離する送受信分波器に適用した場
合においては、送信信号周波数ｆT が従来技術より（Ａ
2 −Ａ1 ）分増加するので、ＰT −ＰR 以上の減衰量が
容易に得られ、通過損失が少なく、小型で軽量になる。Such a bandpass filter is, for example,
As shown in FIG. 6, when applied to a transmission / reception demultiplexer that separates a reception signal and a transmission signal having a frequency lower than the reception signal, the transmission signal frequency f T is (A
Since it is increased by 2- A 1 ), an attenuation amount of P T -P R or more can be easily obtained, the passage loss is small, and the device is small and lightweight.
【００１０】ここで、前記実施例は標準導波管開口部の
幅をａからｂへ段差を設けて狭めたものであったが、本
発明はこの例に限ることなく、図４に示すように開口幅
を階段状に変化させ、かつ帯域通過フィルタ内に整合回
路を設けた構成とすることができる。或いは、図５のよ
うに開口幅をテーパ状に変化させた構成としてもよい。
いずれにしても前記実施例と同様の効果が得られ、本発
明の目的を達成することができる。尚、ここではリアク
タンス素子３〜１６を設けている。In the above embodiment, the width of the standard waveguide opening is narrowed by providing a step from a to b, but the present invention is not limited to this example, and as shown in FIG. The aperture width can be changed stepwise, and a matching circuit can be provided in the bandpass filter. Alternatively, as shown in FIG. 5, the opening width may be changed in a tapered shape.
In any case, the same effect as that of the above-described embodiment can be obtained, and the object of the present invention can be achieved. Here, reactance elements 3 to 16 are provided.
【００１１】[0011]
【発明の効果】以上説明したように本発明は、導波管内
の磁界方向の幅を標準導波管開口部より一様に段差を設
けて狭め、かつその間に入出力整合回路を備えたことに
より、帯域通過フィルタに高域通過フィルタの特性を備
えて、低域における減衰量を増加でき、低域での減衰量
の確保は容易になり、通過損失も少なく、小型化かつ重
量が軽減できるという効果がある。As described above, according to the present invention, the width in the magnetic field direction in the waveguide is narrowed by providing a uniform step from the standard waveguide opening, and the input / output matching circuit is provided between them. As a result, the band-pass filter has the characteristics of a high-pass filter, so that the amount of attenuation in the low range can be increased, the amount of attenuation in the low range can be easily secured, the passage loss is small, and the size and weight can be reduced. There is an effect.
【図１】本発明の帯域通過フィルタの一実施例の斜視図
である。FIG. 1 is a perspective view of an embodiment of a bandpass filter of the present invention.
【図２】図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図３】本発明と従来の各フィルタの特性を比較するた
めの特性図である。FIG. 3 is a characteristic diagram for comparing the characteristics of the present invention and conventional filters.
【図４】本発明の他の実施例の断面図である。FIG. 4 is a sectional view of another embodiment of the present invention.
【図５】本発明の更に異なる他の実施例の断面図であ
る。FIG. 5 is a sectional view of still another embodiment of the present invention.
【図６】帯域通過フィルタを送受信分波器に適用した場
合の構成図である。FIG. 6 is a configuration diagram when a band pass filter is applied to a transmission / reception demultiplexer.
【図７】従来の帯域通過フィルタの一例の斜視図であ
る。FIG. 7 is a perspective view of an example of a conventional bandpass filter.
【図８】図７のＢ−Ｂ線断面図である。8 is a cross-sectional view taken along line BB of FIG.
１，２ 入出力整合回路 ３〜１６ リアクタンス素子 ２０，２１ 標準導波管開口部 ４０ 帯域通過フィルタ 1, 2 I / O matching circuit 3-16 Reactance element 20, 21 Standard waveguide opening 40 Band pass filter
Claims (2)
成される帯域通過フィルタにおいて、導波管内の磁界方
向の幅を標準導波管開口部より一様に段差を設けて狭
め、かつその間に入出力整合回路を備えたことを特徴と
する帯域通過フィルタ。1. A bandpass filter comprising a reactance element provided in a waveguide, wherein the width of the inside of the waveguide in the magnetic field direction is narrowed by providing a uniform step from the standard waveguide opening, and between them. A band pass filter comprising an input / output matching circuit.
テーパ状に変化させてなる請求項１の帯域通過フィル
タ。2. The band pass filter according to claim 1, wherein the width in the magnetic field direction in the waveguide is changed stepwise or in a taper shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7303592A JPH05243813A (en) | 1992-02-26 | 1992-02-26 | Band pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7303592A JPH05243813A (en) | 1992-02-26 | 1992-02-26 | Band pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05243813A true JPH05243813A (en) | 1993-09-21 |
Family
ID=13506697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7303592A Pending JPH05243813A (en) | 1992-02-26 | 1992-02-26 | Band pass filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05243813A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2847073A1 (en) * | 2002-11-11 | 2004-05-14 | Nec Microwave Tube Ltd | Communications travelling wave tube/klystron construction having output waveguide directly coupled radio frequency signal output access with pass band filter incorporated waveguide |
-
1992
- 1992-02-26 JP JP7303592A patent/JPH05243813A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2847073A1 (en) * | 2002-11-11 | 2004-05-14 | Nec Microwave Tube Ltd | Communications travelling wave tube/klystron construction having output waveguide directly coupled radio frequency signal output access with pass band filter incorporated waveguide |
| US7088060B2 (en) | 2002-11-11 | 2006-08-08 | Nec Microwave Tube, Inc. | Electron tube for communication |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9431690B2 (en) | Dielectric waveguide filter with direct coupling and alternative cross-coupling | |
| US5066933A (en) | Band-pass filter | |
| US7332982B2 (en) | Waveguide diplexer of electric plane T-junction structure with resonant iris | |
| US4184130A (en) | Filter devices incorporating dielectric resonators and leakage cable | |
| US6252476B1 (en) | Microstrip resonators and coupled line bandpass filters using same | |
| JPH06511119A (en) | Narrowband pass/broadband rejection filter | |
| JPH01152801A (en) | Waveguide band-pass filter | |
| JPH05243813A (en) | Band pass filter | |
| US5699029A (en) | Simultaneous coupling bandpass filter and method | |
| JPS6219081B2 (en) | ||
| JP2607780B2 (en) | Waveguide type filter device | |
| JPS63308401A (en) | Coaxial branching filter | |
| JP4384620B2 (en) | Dielectric waveguide bandstop filter | |
| JP3239444B2 (en) | Dielectric microwave filter | |
| JPH0730304A (en) | High order high frequency filter | |
| JPH08293703A (en) | Cavity type band-pass filter with comb line structure | |
| JPH0220001B2 (en) | ||
| JPS6378601A (en) | Corrugated filter | |
| GB2269704A (en) | Microwave filter | |
| EP0878862B1 (en) | Simultaneous coupling bandpass filter and method | |
| US6448871B1 (en) | Dielectric filter, dielectric duplexer, and communication apparatus | |
| JPS588761B2 (en) | Waveguide bandpass “ro” wave device | |
| JP2519747B2 (en) | Dielectric polar filter | |
| JPH11308012A (en) | Waveguide type filter | |
| SU879685A1 (en) | Frequency separator |