JP2722166B2 - Low-pass filter - Google Patents
Low-pass filterInfo
- Publication number
- JP2722166B2 JP2722166B2 JP5296386A JP29638693A JP2722166B2 JP 2722166 B2 JP2722166 B2 JP 2722166B2 JP 5296386 A JP5296386 A JP 5296386A JP 29638693 A JP29638693 A JP 29638693A JP 2722166 B2 JP2722166 B2 JP 2722166B2
- Authority
- JP
- Japan
- Prior art keywords
- pass filter
- low
- coaxial
- waveguide
- stop band
- 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
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Description
【０００１】[0001]
【産業上の利用分野】本発明は低域通過ろ波器に関し、
特に広い阻止帯域を有しかつ耐電力性に優れた導波管型
低域通過ろ波器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-pass filter,
In particular, the present invention relates to a waveguide type low-pass filter having a wide stop band and excellent power durability.
【０００２】[0002]
【従来の技術】従来、この種の導波管型低域通過ろ波器
としては、コルゲート型とワッフルアイアン型とがあ
る。コルゲート型では矩形導波管の広幅面の電波伝搬方
向に沿って、その電波伝搬方向に直交する方向に延びる
隆起部と溝部とが交互に連続して設けられている。この
種のコルゲート型の低域通過ろ波器としては、特開昭６
３−１６６３０１号公報に開示された技術がある。2. Description of the Related Art Conventionally, there are a corrugated type and a waffle iron type as this type of waveguide type low-pass filter. In the corrugated type, ridges and grooves extending in a direction orthogonal to the radio wave propagation direction are provided alternately and continuously along the radio wave propagation direction on the wide surface of the rectangular waveguide. As this type of corrugated low-pass filter, Japanese Unexamined Patent Publication No.
There is a technique disclosed in Japanese Patent Application Laid-Open No. 3-166301.
【０００３】また、ワッフルアイアン型は、図６に示す
ように、矩形導波管１０の広幅面の電波伝搬方向及びこ
の電波伝搬方向に直交する方向に夫々沿って、隆起部１
１と溝部１２とが交互に連続して設けられている。In the waffle iron type, as shown in FIG. 6, a raised portion 1 is formed along a radio wave propagation direction on a wide surface of a rectangular waveguide 10 and a direction orthogonal to the radio wave propagation direction.
1 and grooves 12 are provided alternately and continuously.
【０００４】この種のワッフルアイアン型の低域通過ろ
波器としては、実開昭５７−２０２２０２号のマイクロ
フィルムや特開昭５９−１８５４０３号公報に開示され
た技術がある。As a waffle iron type low-pass filter of this type, there is a technique disclosed in Japanese Utility Model Laid-Open No. Sho 57-202202 and a technique disclosed in Japanese Patent Laid-Open Publication No. Sho 59-185403.
【０００５】[0005]
【発明が解決しようとする課題】上述した従来の導波管
型低域通過ろ波器では、矩形導波管の広幅面に隆起部と
溝部とを交互に連続して設けているので、構造が複雑と
なり、コスト高になるという問題がある。In the conventional waveguide type low-pass filter described above, the ridges and the grooves are provided alternately and continuously on the wide surface of the rectangular waveguide. However, there is a problem that the cost becomes high and the cost increases.
【０００６】特に、特開昭６３−１６６３０１号公報に
開示されたコルゲート型の低域通過ろ波器や特開昭５９
−１８５４０３号公報に開示されたワッフルアイアン型
の低域通過ろ波器のように隆起部の高さを２種類にした
場合や、あるいは実開昭５７−２０２２０２号のマイク
ロフィルムに開示されたワッフルアイアン型の低域通過
ろ波器のように隆起部の形状を変えた場合にはさらに構
造が複雑となる。In particular, a corrugated low-pass filter disclosed in Japanese Patent Application Laid-Open No. 63-166301 and Japanese Patent Application Laid-Open No.
No. 185403, the waffle disclosed in Japanese Unexamined Utility Model Publication No. 57-202202. When the shape of the ridge is changed as in the case of an iron-type low-pass filter, the structure is further complicated.
【０００７】また、低域通過ろ波器を構成する導波管内
の隆起部と溝部とにおける上下の一致度、つまり加工精
度がわずかでも悪いと、図７に示すように、阻止帯域内
に共振が生じ、スプリアス特性が悪くなるという問題が
ある。If the degree of coincidence between the ridges and the grooves in the waveguide constituting the low-pass filter is high or low, that is, if the processing accuracy is slightly poor, resonance occurs in the stop band as shown in FIG. And the spurious characteristics deteriorate.
【０００８】さらに、広い阻止帯域を実現するために
は、低域通過ろ波器を構成する導波管内の隆起部におけ
る上下の間隔を非常に狭くする必要があるが、この間隔
を狭くすると高電力用には適さなくなるという問題があ
る。Further, in order to realize a wide stop band, it is necessary to make the upper and lower spaces of the ridges in the waveguide constituting the low-pass filter very narrow. There is a problem that it is not suitable for electric power.
【０００９】さらにまた、低域通過ろ波器を構成する導
波管内の隆起部及び溝部の寸法によって周波数特性が決
定されるため、異なった特性が要求される場合には隆起
部及び溝部の寸法をその特性に応じて変更しなければな
らないが、それら隆起部及び溝部とからなる矩形導波管
の構造が複雑であるので、容易に変更することが難し
い。Furthermore, since the frequency characteristics are determined by the dimensions of the ridges and grooves in the waveguide constituting the low-pass filter, when different characteristics are required, the dimensions of the ridges and grooves are required. Must be changed according to its characteristics, but it is difficult to easily change it because the structure of the rectangular waveguide composed of the ridges and the grooves is complicated.
【００１０】そこで、本発明の目的は上記の問題点を解
消し、構造を簡単にすることができ、広い阻止帯域を有
しかつ耐電力性及び汎用性に優れた低域通過ろ波器を提
供することにある。Accordingly, an object of the present invention is to provide a low-pass filter which can solve the above problems, can have a simple structure, has a wide stop band, is excellent in power durability and versatility. To provide.
【００１１】[0011]
【課題を解決するための手段】本発明による低域通過ろ
波器は、矩形導波管からなる低域通過ろ波器であって、
前記矩形導波管内に設けられかつ高周波成分を除去する
同軸低域通過ろ波器と、前記矩形導波管内に設けられか
つ前記同軸低域通過ろ波器への入出力信号のモードを変
換する同軸導波管変換器とを備えている。The low-pass filter according to the present invention is a low-pass filter comprising a rectangular waveguide,
A coaxial low-pass filter that is provided in the rectangular waveguide and removes high-frequency components, and converts a mode of an input / output signal to and from the coaxial low-pass filter that is provided in the rectangular waveguide and is provided. A coaxial waveguide converter.
【００１２】本発明による他の低域通過ろ波器は、上記
の構成のほかに、前記同軸低域通過ろ波器と前記同軸導
波管変換器との結合部分に設けられかつ前記同軸低域通
過ろ波器における高次モードの信号の発生を抑止するリ
ング部材を備えている。Another low-pass filter according to the present invention, in addition to the above configuration, is provided at a coupling portion between the coaxial low-pass filter and the coaxial waveguide converter and includes the coaxial low-pass filter. A ring member is provided for suppressing the generation of higher-order mode signals in the band-pass filter.
【００１３】[0013]
【実施例】次に、本発明について図面を参照して説明す
る。Next, the present invention will be described with reference to the drawings.
【００１４】図１は本発明の一実施例を示す構成図であ
る。図において、低域通過ろ波器１は同軸低域通過ろ波
器部２と、矩形導波管部５ａ，５ｂと、同軸導波管変換
器部７ａ，７ｂとから構成されている。FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, a low-pass filter 1 includes a coaxial low-pass filter section 2, rectangular waveguide sections 5a and 5b, and coaxial waveguide converter sections 7a and 7b.
【００１５】同軸低域通過ろ波器部２は外導体３と、軸
径が細い軸径部分４ａと軸径が太い軸径部分４ｂとがあ
る間隔で夫々複数個ずつ設けられた中心導体４とから構
成されている。ここで、中心導体４は矩形導波管部５
ａ、５ｂに夫々設けられたリッジ６ａ、６ｂに接着固定
されている。The coaxial low-pass filter section 2 includes an outer conductor 3, a plurality of central conductors 4 provided at intervals with a small-diameter shaft diameter portion 4a and a large-diameter shaft diameter portion 4b. It is composed of Here, the center conductor 4 is a rectangular waveguide portion 5
a and 5b are adhesively fixed to ridges 6a and 6b provided respectively.
【００１６】矩形導波管部５ａ、５ｂの一端には短絡面
が設けられており、また広幅面の中心にはリッジ６ａ，
６ｂが設けられている。尚、高電力用として用いると、
リッジ６ａ，６ｂと中心導体４との結合部が発熱するの
で、前記結合部の発熱を矩形導波管部５ａ、５ｂのケー
スに逃がすように、リッジ６ａ、６ｂを矩形導波管部５
ａ、５ｂとの接触面を広くとるように形成する。A short-circuit surface is provided at one end of each of the rectangular waveguide portions 5a and 5b, and ridges 6a and 6a are provided at the center of the wide surface.
6b is provided. When used for high power,
Ridge 6a, since the coupling portion between 6b and the center conductor 4 generates heat, so as to release the heat generated of the coupling portion rectangular waveguide portion 5a, and 5b of the case, the ridge 6a, 6b of the rectangular waveguide section 5
a and 5b are formed so as to have a wide contact surface.
【００１７】同軸導波管変換器部７ａ，７ｂは同軸低域
通過ろ波器部２と矩形導波管部５ａ、５ｂとの結合部
分、つまり同軸低域通過ろ波器部２の両端に夫々設けら
れ、中心導体４と矩形導波管部５ａ、５ｂとリッジ６
ａ、６ｂとによって形成されている。The coaxial waveguide converters 7a and 7b are provided at the connection between the coaxial low-pass filter 2 and the rectangular waveguides 5a and 5b, that is, at both ends of the coaxial low-pass filter 2. The center conductor 4, the rectangular waveguide portions 5a and 5b, and the ridge 6 are provided respectively.
a and 6b.
【００１８】低域通過ろ波器１に信号が伝搬されてくる
と、その信号は矩形導波管部５ａを介して同軸導波管変
換器部７ａに伝搬される。同軸導波管変換器部７ａでは
矩形導波管部５ａを伝搬される信号のモードを同軸低域
通過ろ波器部２に入力される信号のモードに変換する。When a signal is propagated to the low-pass filter 1, the signal is propagated to the coaxial waveguide converter 7a via the rectangular waveguide 5a. The coaxial waveguide converter 7a converts the mode of the signal propagated through the rectangular waveguide 5a into the mode of the signal input to the coaxial low-pass filter 2.
【００１９】同軸低域通過ろ波器部２は同軸導波管変換
器部７ａでモードが変換された信号が伝搬されてくる
と、その高周波成分を切って同軸導波管変換器部７ｂに
出力する。同軸導波管変換器部７ｂでは同軸低域通過ろ
波器部２から出力される信号のモードを、矩形導波管部
５ｂで伝搬される信号のモードに変換する。When the signal whose mode has been converted by the coaxial waveguide converter section 7a is propagated, the coaxial low-pass filter section 2 cuts off the high-frequency component and sends the signal to the coaxial waveguide converter section 7b. Output. The coaxial waveguide converter 7b converts the mode of the signal output from the coaxial low-pass filter 2 into the mode of the signal propagated by the rectangular waveguide 5b.
【００２０】図２は図１の低域通過ろ波器１における周
波数と減衰量との関係を示す図である。図においては、
低域通過ろ波器１を通常の電力用に形成した場合の周波
数と減衰量との関係を示している。FIG. 2 is a diagram showing the relationship between frequency and attenuation in the low-pass filter 1 of FIG. In the figure,
The relationship between the frequency and the attenuation when the low-pass filter 1 is formed for normal power is shown.
【００２１】この図２に示すように、低域通過ろ波器１
においては阻止帯域が通過周波数の３倍以上であって
も、その阻止帯域では図６に示す従来例のように阻止帯
域内に共振が生じることはなく、スプリアス特性が悪く
なることない。As shown in FIG. 2, the low-pass filter 1
In this case, even if the stop band is three times or more the pass frequency, resonance does not occur in the stop band in the stop band unlike the conventional example shown in FIG. 6, and the spurious characteristics do not deteriorate.
【００２２】よって、低域通過ろ波器１を高電力用に設
計することで、広い阻止帯域を有しかつ耐電力性に優れ
た低域通過ろ波器とすることができる。この場合、上述
の如く、構造が極めて単純であるため、低コスト化する
ことができる。Therefore, by designing the low-pass filter 1 for high power, a low-pass filter having a wide stop band and excellent power durability can be obtained. In this case, as described above, since the structure is extremely simple, the cost can be reduced.
【００２３】また、阻止帯域は同軸線路の寸法によって
任意に選択することができる。また、同軸線路の寸法の
変更は中心導体４のみの交換で行えるため、汎用性に優
れた低域通過ろ波器を実現することができる。The stop band can be arbitrarily selected according to the size of the coaxial line. Further, since the size of the coaxial line can be changed by replacing only the center conductor 4, a low-pass filter excellent in versatility can be realized.
【００２４】図３は図１の低域通過ろ波器１における周
波数と減衰量との関係を示す図である。図においては、
低域通過ろ波器１を高電力用に形成した場合の周波数と
減衰量との関係を示している。FIG. 3 is a diagram showing the relationship between frequency and attenuation in the low-pass filter 1 of FIG. In the figure,
The relationship between the frequency and the attenuation when the low-pass filter 1 is formed for high power is shown.
【００２５】この図３に示すように、低域通過ろ波器１
においては高電力用に形成した場合、同軸低域通過ろ波
器部２の両端の径を大きくする必要がある。そのため、
阻止帯域が通過帯域の２倍程度であれば、図７に示す従
来例のように阻止帯域内に共振が生じることはなく、ス
プリアス特性が悪くなることもない。As shown in FIG. 3, the low-pass filter 1
In this case, when formed for high power, it is necessary to increase the diameter of both ends of the coaxial low-pass filter unit 2. for that reason,
If the stop band is about twice the pass band, resonance does not occur in the stop band as in the conventional example shown in FIG. 7, and the spurious characteristics do not deteriorate.
【００２６】しかしながら、上記の低域通過ろ波器１で
は阻止帯域が通過帯域の３倍以上になると、図３に示す
ように、阻止帯域内に共振が生じ、スプリアス特性が悪
くなる。このスプリアス特性が悪くなる原因としては、
同軸低域通過炉波器部２が高電力用に形成されているた
めに生ずる高次モードの発生がある。However, in the low-pass filter 1 described above, when the stop band is three times or more the pass band, resonance occurs in the stop band as shown in FIG. 3 and the spurious characteristics deteriorate. The cause of this spurious characteristic is
There are higher modes that occur because the coaxial low-pass reactor section 2 is formed for high power.
【００２７】同軸線路中はＴＥＭ波であり、最初の高次
モードはＴＥ11モードである。このＴＥ11モードの発生
する周波数ｆは外導体３の半径をａとし、中心導体４の
半径をｂとすると、 ｆ＝３００／π（ａ＋ｂ） という式で表される。The TEM wave is present in the coaxial line, and the first higher-order mode is the TE 11 mode. The frequency f at which the TE 11 mode is generated is represented by the following equation, where a is the radius of the outer conductor 3 and b is the radius of the center conductor 4: f = 300 / π (a + b)
【００２８】このＴＥ11モードの発生を抑圧すること
で、さらに広い阻止帯域を実現することができる。By suppressing the occurrence of the TE 11 mode, a wider stop band can be realized.
【００２９】図４は本発明の他の実施例を示す構成図で
ある。図において、本発明の他の実施例による低域通過
ろ波器８は同軸低域通過ろ波器部２と同軸導波管変換器
部７ａ，７ｂとの結合部分にリング部材９ａ，９ｂを設
けた以外は図１に示す本発明の一実施例と同様の構成と
なっており、同一構成要素には同一符号を付してある。
また、それら同一構成要素の動作は本発明の一実施例と
同様である。FIG. 4 is a block diagram showing another embodiment of the present invention. Referring to the drawing, a low-pass filter 8 according to another embodiment of the present invention includes ring members 9a and 9b at a joint between the coaxial low-pass filter unit 2 and the coaxial waveguide converter units 7a and 7b. Except for the configuration, the configuration is the same as that of the embodiment of the present invention shown in FIG. 1, and the same components are denoted by the same reference numerals.
The operation of these same components is the same as in the embodiment of the present invention.
【００３０】低域通過ろ波器８では同軸低域通過ろ波器
部２と同軸導波管変換器部７ａ，７ｂとの結合部分にリ
ング部材９ａ，９ｂを取付けることによって、同軸低域
通過ろ波器部２でのＴＥ11モードの発生を抑圧するよう
にしている。In the low-pass filter 8, the ring members 9a and 9b are attached to the joint between the coaxial low-pass filter section 2 and the coaxial waveguide converter sections 7a and 7b, so that the coaxial low-pass filter section 8 is provided. and so as to suppress the occurrence of TE 11 mode in the wave filter portion 2.
【００３１】図５は図１の低域通過ろ波器８における周
波数と減衰量との関係を示す図である。図においては、
低域通過ろ波器８を高電力用に形成した場合の周波数と
減衰量との関係を示している。FIG. 5 is a diagram showing the relationship between frequency and attenuation in the low-pass filter 8 of FIG. In the figure,
The relationship between the frequency and the attenuation when the low-pass filter 8 is formed for high power is shown.
【００３２】この図に示すように、低域通過ろ波器８に
おいては同軸低域通過ろ波器部２を高電力用に形成した
場合、通過帯域の３倍以上の阻止帯域、つまり通過帯域
が５８５０〜６４２５ＭＨｚであれば１７．４７５〜１
９．３５ＧＨｚの阻止帯域において、図７に示す従来例
や図３に示す本発明の一実施例のように阻止帯域内に共
振が生じることはなく、スプリアス特性が悪くなること
はない。As shown in this figure, in the low-pass filter 8, when the coaxial low-pass filter section 2 is formed for high power, the stop band, ie, the pass band, is three times or more the pass band. Is 17.475 to 1 if the frequency is 5850 to 6425 MHz.
In the stop band of 9.35 GHz, resonance does not occur in the stop band unlike the conventional example shown in FIG. 7 and the embodiment of the present invention shown in FIG. 3, and the spurious characteristics do not deteriorate.
【００３３】これはリング部材９ａ，９ｂによって同軸
低域通過ろ波器部２でのＴＥ11モードの発生を抑圧して
いるので、同軸低域通過ろ波器部２を高電力用に形成し
ても阻止帯域内に共振が生じることがないためである。[0033] This ring member 9a, so that by suppressing the occurrence of TE 11 mode coaxial low-pass wave filter portion 2 by 9b, to form a coaxial low-pass wave filter unit 2 for high power This is because no resonance occurs in the stop band.
【００３４】よって、低域通過ろ波器８を高電力用に設
計することで、広い阻止帯域を有しかつ耐電力性に優れ
た低域通過ろ波器とすることができる。この場合、上述
の如く、構造が極めて単純であるため、低コスト化する
ことができる。Therefore, by designing the low-pass filter 8 for high power, a low-pass filter having a wide stop band and excellent power durability can be obtained. In this case, as described above, since the structure is extremely simple, the cost can be reduced.
【００３５】また、阻止帯域は同軸線路の寸法によって
任意に選択することができる。また、同軸線路の寸法の
変更は中心導体４のみの交換で行えるため、汎用性に優
れた低域通過ろ波器を実現することができる。The stop band can be arbitrarily selected according to the size of the coaxial line. Further, since the size of the coaxial line can be changed by replacing only the center conductor 4, a low-pass filter excellent in versatility can be realized.
【００３６】しかも、低域通過ろ波器８では阻止帯域が
通過帯域の３倍以上になっても、リング部材９ａ，９ｂ
によって同軸低域通過ろ波器部２でのＴＥ11モードの発
生が抑圧されるので、阻止帯域内に共振が生じることは
なく、スプリアス特性が悪くなることもない。Moreover, in the low-pass filter 8, even if the stop band becomes three times or more the pass band, the ring members 9a, 9b
As a result, the occurrence of the TE 11 mode in the coaxial low-pass filter unit 2 is suppressed, so that no resonance occurs in the stop band and the spurious characteristics do not deteriorate.
【００３７】このように、低域通過ろ波器１に伝搬され
てきた信号を同軸導波管変換器部７ａで矩形導波管部５
ａを伝搬される信号のモードを同軸低域通過ろ波器部２
に入力される信号のモードに変換し、このモードが変換
された信号の高周波成分を同軸低域通過ろ波器部２で切
って同軸導波管変換器部７ｂに出力して矩形導波管部５
ｂで伝搬される信号のモードに変換することによって、
構造を簡単にすることができ、広い阻止帯域を有しかつ
耐電力性及び汎用性に優れた低域通過ろ波器を提供する
ことができる。As described above, the signal propagated to the low-pass filter 1 is converted by the coaxial waveguide converter section 7a into the rectangular waveguide section 5a.
The mode of the signal propagated through a
Is converted into a mode of a signal input to the rectangular waveguide, and the high-frequency component of the signal converted into this mode is cut by the coaxial low-pass filter unit 2 and output to the coaxial waveguide converter unit 7b. Part 5
By converting to the mode of the signal propagated in b,
A low-pass filter having a simple structure, a wide stop band, and excellent power durability and versatility can be provided.
【００３８】また、同軸低域通過ろ波器部２と同軸導波
管変換器部７ａ，７ｂとの結合部分に取付けたリング部
材９ａ，９ｂで同軸低域通過ろ波器部２でのＴＥ11モー
ドの発生を抑圧することによって、通過帯域の３倍以上
の阻止帯域で共振が発生するのを防止することができ、
スプリアス特性の悪化を防止することができる。Further, the ring members 9a and 9b attached to the joint between the coaxial low-pass filter unit 2 and the coaxial waveguide converter units 7a and 7b use the TE in the coaxial low-pass filter unit 2 for the ring members 9a and 9b. By suppressing the generation of 11 modes, it is possible to prevent resonance from occurring in a stop band three times or more the pass band,
Deterioration of spurious characteristics can be prevented.
【００３９】[0039]
【発明の効果】以上説明したように本発明の低域通過ろ
波器によれば、矩形導波管内に高周波成分を除去する同
軸低域通過ろ波器と、同軸低域通過ろ波器への入出力信
号のモードを変換する同軸導波管変換器とを備えること
によって、構造を簡単にすることができ、広い阻止帯域
を有しかつ耐電力性及び汎用性に優れた低域通過ろ波器
を提供することができるという効果がある。As described above, according to the low-pass filter of the present invention, a coaxial low-pass filter for removing high-frequency components in a rectangular waveguide and a coaxial low-pass filter are provided. And a coaxial waveguide converter for converting the mode of the input / output signal of the input / output signal, thereby simplifying the structure, having a wide stop band, and having a low pass filter excellent in power durability and versatility. There is an effect that a wave device can be provided.
【００４０】また、本発明の他の低域通過ろ波器によれ
ば、同軸低域通過ろ波器と同軸導波管変換器との結合部
分に、同軸低域通過ろ波器における高次モードの信号の
発生を抑止するリング部材を備えることによって、構造
を簡単にすることができ、通過帯域の３倍以上の広い阻
止帯域を有しかつ耐電力性及び汎用性に優れた低域通過
ろ波器を提供するという効果がある。According to another low-pass filter of the present invention, a high-order coaxial low-pass filter is provided at a coupling portion between the coaxial low-pass filter and the coaxial waveguide converter. By providing a ring member that suppresses the generation of mode signals, the structure can be simplified, and a low-pass filter having a wide stop band of at least three times the pass band and having excellent power durability and versatility. There is an effect of providing a filter.
【図１】本発明の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing one embodiment of the present invention.
【図２】図１の低域通過ろ波器における周波数と減衰量
との関係を示す図である。FIG. 2 is a diagram showing a relationship between frequency and attenuation in the low-pass filter of FIG. 1;
【図３】図１の低域通過ろ波器における周波数と減衰量
の関係を示す図である。FIG. 3 is a diagram showing a relationship between frequency and attenuation in the low-pass filter of FIG. 1;
【図４】本発明の他の実施例を示す構成図である。FIG. 4 is a configuration diagram showing another embodiment of the present invention.
【図５】図４の低域通過ろ波器における周波数と減衰量
との関係を示す図である。FIG. 5 is a diagram illustrating a relationship between frequency and attenuation in the low-pass filter of FIG. 4;
【図６】従来例を示す構成図である。FIG. 6 is a configuration diagram showing a conventional example.
【図７】図６の低域通過ろ波器における周波数と減衰量
との関係を示す図である。FIG. 7 is a diagram illustrating a relationship between frequency and attenuation in the low-pass filter of FIG. 6;
１，８ 低域通過ろ波器 ２ 同軸低域通過ろ波器部 ３ 外導体 ４ 中心導体 ４ａ 細い軸径部分 ４ｂ 太い軸径部分 ５ａ、５ｂ 矩形導波管 ６ａ、６ｂ リッジ ７ａ、７ｂ 同軸導波管変換器部 ９ａ、９ｂ リング部材1,8 Low-pass filter 2 Coaxial low-pass filter part 3 Outer conductor 4 Center conductor 4a Narrow shaft diameter part 4b Thick shaft diameter part 5a, 5b Rectangular waveguide 6a, 6b Ridge 7a, 7b Coaxial conductor Wave tube converter section 9a, 9b Ring member
Claims (2)
って、前記矩形導波管内に設けられかつ高周波成分を除
去する同軸低域通過ろ波器と、前記矩形導波管内に設け
られかつ前記同軸低域通過ろ波器への入出力信号のモー
ドを変換する同軸導波管変換器とを含み、前記同軸低域
通過ろ波器と前記同軸導波管変換器との結合部に設けら
れかつ前記同軸低域通過ろ波器における高次モードの信
号の発生を抑制するリング部材を有することを特徴とす
る低域通過ろ波器。1. A low-pass filter comprising a rectangular waveguide, wherein the coaxial low-pass filter is provided in the rectangular waveguide and removes a high-frequency component. And a coaxial waveguide converter for converting a mode of an input / output signal to the coaxial low-pass filter, and coupling the coaxial low-pass filter with the coaxial waveguide converter. A low-pass filter provided in the unit and having a ring member for suppressing generation of a higher-order mode signal in the coaxial low-pass filter.
低域通過ろ波器を構成するが移動体の内径よりも小さい
ことを特徴とする請求項１記載の低域通過ろ波器。2. The low-pass filter according to claim 1, wherein the inner diameter of the ring member constitutes the coaxial low-pass filter, but is smaller than the inner diameter of the moving body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5296386A JP2722166B2 (en) | 1993-11-26 | 1993-11-26 | Low-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5296386A JP2722166B2 (en) | 1993-11-26 | 1993-11-26 | Low-pass filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07154101A JPH07154101A (en) | 1995-06-16 |
| JP2722166B2 true JP2722166B2 (en) | 1998-03-04 |
Family
ID=17832881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5296386A Expired - Lifetime JP2722166B2 (en) | 1993-11-26 | 1993-11-26 | Low-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2722166B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100507634C (en) | 2004-04-21 | 2009-07-01 | 松下电器产业株式会社 | Photonic crystal device |
| JP5692242B2 (en) | 2011-01-25 | 2015-04-01 | 日本電気株式会社 | Coaxial waveguide converter and ridge waveguide |
| CN104617362B (en) * | 2015-01-30 | 2017-11-28 | 东莞鸿爱斯通信科技有限公司 | Low pass filter with transmission zero |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119607U (en) * | 1983-01-31 | 1984-08-13 | 富士通株式会社 | Coaxial waveguide conversion structure |
| JPH01107204U (en) * | 1988-01-12 | 1989-07-19 |
-
1993
- 1993-11-26 JP JP5296386A patent/JP2722166B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07154101A (en) | 1995-06-16 |
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