JP2010021599A - Transmission device with built-in noise suppression filter - Google Patents

Transmission device with built-in noise suppression filter Download PDF

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JP2010021599A
JP2010021599A JP2008177462A JP2008177462A JP2010021599A JP 2010021599 A JP2010021599 A JP 2010021599A JP 2008177462 A JP2008177462 A JP 2008177462A JP 2008177462 A JP2008177462 A JP 2008177462A JP 2010021599 A JP2010021599 A JP 2010021599A
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filter box
filter
waveguide
transmission
built
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JP5091035B2 (en
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Hiroshi Washimi
洋 鷲見
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New Japan Radio Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress resonance of high-order modes entering in a gap between a filter box and a waveguide without employing press-fit attaching of the filter box. <P>SOLUTION: In the transmission device with a built-in filter in which a rectangular filter box 12 having a filter 12F with transmission frequency band attenuation characteristics is attached into a waveguide portion 10, for example, a round through-hole 20 is provided at the center portion in a long side direction in a vertical surface (surface of long side of rectangular opening) of the inner wall side of a waveguide portion 10 of the filter box 12. With this configuration, the high-order mode flowing into a subtle gap between the inner wall of the waveguide 10 and the outer side surface of the filter box 12 is returned back into the filter box 12 from the through-hole 20, the high-order mode reflected at the rear surface of a flange 12b is also returned back into the filter box 12 from the through-hole 20, and resonance of high-order modes is suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、マイクロ波帯、ミリ波帯の通信装置に使用される雑音抑圧フィルタ内蔵伝送装置で、特に伝送波へ与える雑音やスプリアスを抑圧するためのフィルタ箱を導波管に内蔵する伝送装置の構成に関する。   The present invention relates to a transmission device with a built-in noise suppression filter used in microwave band and millimeter wave band communication apparatuses, and in particular, a transmission apparatus with a filter box for suppressing noise and spurious applied to a transmission wave incorporated in a waveguide. Concerning the configuration of

図５には、従来の雑音抑圧フィルタ内臓伝送装置（例えば下記特許文献１）の構成が示されており、図５（Ａ）に示されるように、矩形導波管１の開口部に、伝送周波数帯域減衰特性を持つ直方体状のフィルタ箱２が固着される。このフィルタ箱２は、端部側（図左側）に開口２ａ及びフランジ２ｂが設けられ、この開口２ａに対向する面（図右側）で導波管伝送路の伝送方向に直交する面に、伝送周波数帯域減衰特性を持つフィルタ２Ｆが形成される。このフィルタ２Ｆは、伝送路の伝送方向に直交する面の一部に、例えば形状、寸法を調整した開口を形成したものである。   FIG. 5 shows the configuration of a conventional noise suppression filter built-in transmission device (for example, Patent Document 1 below). As shown in FIG. 5 (A), transmission to the opening of the rectangular waveguide 1 is performed. A rectangular parallelepiped filter box 2 having a frequency band attenuation characteristic is fixed. The filter box 2 is provided with an opening 2a and a flange 2b on the end side (left side in the figure), and is transmitted to a surface orthogonal to the transmission direction of the waveguide transmission path on the surface (right side in the figure) facing the opening 2a. A filter 2F having a frequency band attenuation characteristic is formed. This filter 2F has an opening whose shape and dimensions are adjusted, for example, in a part of a surface orthogonal to the transmission direction of the transmission path.

このようなフィルタ箱２によれば、導波管１の内部の所定位置にフィルタ２Ｆを容易に配置することができ、このフィルタ２Ｆによって、例えば受信機側への影響としての受信帯域の雑音やスプリアスを抑圧することができる。
特開２００５−３３３４４５号公報 According to such a filter box 2, the filter 2F can be easily arranged at a predetermined position inside the waveguide 1. With this filter 2F, for example, noise in the reception band as an influence on the receiver side, Spurious can be suppressed.
JP 2005-333445 A

しかしながら、上述のフィルタ箱２を有する伝送装置においては、導波管１の開口部からフィルタ箱２を挿入配置することになるが、この導波管１の内壁とフィルタ箱２の外側面との間に、微少の隙間（クリアランス）ができ、この隙間にフィルタ面で発生した高次モードが入ることで、高次モードの共振が発生し、これが受信帯域等の雑音やスプリアスとして現れるという問題があった。   However, in the transmission apparatus having the filter box 2 described above, the filter box 2 is inserted and disposed through the opening of the waveguide 1. However, the inner wall of the waveguide 1 and the outer surface of the filter box 2 There is a problem that a minute gap (clearance) is formed between them, and the higher-order mode generated on the filter surface enters this gap, so that higher-order mode resonance occurs, which appears as noise and spurious in the reception band. there were.

即ち、図５（Ａ）に示される例（隙間を大きく描いている）では、導波管１の内壁とフィルタ箱２の外側面との隙間に入った高次モード（波）がフランジ２ｂの後面で反射されることで、この隙間に流入した高次モードにより高次モード共振が生じる。また、図５（Ｂ）に示される例では、フランジのないフィルタ箱４（フィルタ４Ｆを有する）が用いられているが、この場合でも、導波管１の開口部に接続される他の部材５の面で、隙間に入った高次モードが反射され、これによって高次モードの共振が生じる。   That is, in the example shown in FIG. 5A (the gap is drawn large), the higher-order mode (wave) that enters the gap between the inner wall of the waveguide 1 and the outer surface of the filter box 2 is the flange 2b. Reflecting on the rear surface causes higher-order mode resonance due to higher-order modes flowing into the gap. Further, in the example shown in FIG. 5B, the filter box 4 (having the filter 4F) without a flange is used. However, in this case as well, other members connected to the opening of the waveguide 1 are used. On the surface 5, the higher order mode entering the gap is reflected, and resonance of the higher order mode occurs.

図６は、上記フィルタ箱２を内蔵する伝送装置を送信機に適用した場合の特性の一例であり、この図６では、通過特性が１０１、反射特性が１０２となるが、この例では、通過特性１０１に示されるように、受信帯域（Ｒｘ）のＥｑ部分において、上記高次モード共振により減衰帯域の抑圧特性が悪化している。このような減衰帯域の抑圧特性の悪化は、伝送出力の低下をも招くことになる。   FIG. 6 shows an example of characteristics when the transmission device incorporating the filter box 2 is applied to a transmitter. In FIG. 6, the transmission characteristic is 101 and the reflection characteristic is 102. In this example, the transmission characteristic is As shown by the characteristic 101, in the Eq part of the reception band (Rx), the suppression characteristic of the attenuation band is deteriorated due to the higher-order mode resonance. Such deterioration of the suppression characteristics of the attenuation band also causes a decrease in transmission output.

また、このような問題を解決する方策として、例えばフィルタ箱２を導波管１の開口部から圧入させて取り付け、フィルタ箱２と導波管１内壁とのクリアランスをなくす方法も考えられるが、この場合は、フィルタ箱２の変形が生じたり、このフィルタ箱２と導波管１の寸法精度を上げる必要からコスト高を招いたりすることになり、得策ではない。   Further, as a measure for solving such a problem, for example, a method in which the filter box 2 is press-fitted and attached from the opening of the waveguide 1 and the clearance between the filter box 2 and the inner wall of the waveguide 1 is eliminated can be considered. In this case, the filter box 2 is deformed, or the dimensional accuracy of the filter box 2 and the waveguide 1 needs to be increased. This is not a good idea.

本発明は上記問題点に鑑みてなされたものであり、その目的は、フィルタ箱の圧入取付けによらず、フィルタ箱と導波管との隙間に入る高次モードの共振を抑圧することができる雑音抑圧フィルタ内蔵伝送装置を提供することにある。   The present invention has been made in view of the above problems, and the object thereof is to suppress higher-order mode resonances that enter the gap between the filter box and the waveguide, regardless of the press-fit mounting of the filter box. An object of the present invention is to provide a transmission device with a built-in noise suppression filter.

上記目的を達成するために、請求項１の発明は、矩形導波管伝送路の伝送方向に直交する面に伝送周波数帯域に減衰特性を持つフィルタが形成された直方体状のフィルタ箱を、上記導波管内に取り付ける雑音抑圧フィルタ内蔵（導波管）伝送装置において、上記フィルタ箱の上記導波管内壁側の面に貫通孔を設けたことを特徴とする。
請求項２に係る発明は、上記貫通孔を、上記フィルタ箱の矩形開口長辺側の面で、その長辺方向中心部に設けたことを特徴とする。 In order to achieve the above object, the invention of claim 1 provides a rectangular parallelepiped filter box in which a filter having attenuation characteristics in a transmission frequency band is formed on a surface orthogonal to the transmission direction of a rectangular waveguide transmission line. In the transmission device with a built-in noise suppression filter (waveguide) mounted in the waveguide, a through hole is provided in the surface of the filter box on the waveguide inner wall side.
The invention according to claim 2 is characterized in that the through-hole is provided in the center of the long side direction of the rectangular opening of the filter box.

本発明の構成によれば、フィルタ箱と導波管との微少の隙間に入った高次モードが貫通孔からフィルタ箱内へ戻り、また隙間を通ってフィルタ箱フランジの後面や導波管に接続される他の部材の面で反射された高次モードが、貫通孔からフィルタ箱内へ入ることで、隙間に入った高次モードが分散され、高次モード共振が抑圧される。
また、請求項２の構成の場合は、フィルタ箱の導波管内壁側の面の中の電界が強い部分に貫通孔が設けられるので、高次モードの共振が効率よく抑圧できることになる。 According to the configuration of the present invention, the higher-order mode that has entered a minute gap between the filter box and the waveguide returns from the through hole into the filter box, and passes through the gap to the rear surface of the filter box flange or the waveguide. The higher-order mode reflected by the surface of the other member to be connected enters the filter box from the through hole, so that the higher-order mode that has entered the gap is dispersed and the higher-order mode resonance is suppressed.
Further, in the case of the configuration of claim 2, since the through hole is provided in the portion where the electric field is strong in the surface on the waveguide inner wall side of the filter box, the resonance of the higher order mode can be efficiently suppressed.

本発明の雑音抑圧フィルタ内蔵伝送装置によれば、フィルタ箱の圧入取付けによらず、導波管内壁とフィルタ箱外側面との微少の隙間に入る高次モードの共振を抑圧することができ、減衰帯域の抑圧特性の悪化、伝送出力の低下を招くことがないという効果がある。   According to the transmission device with a built-in noise suppression filter of the present invention, it is possible to suppress higher-order mode resonances that enter a minute gap between the inner wall of the waveguide and the outer surface of the filter box, regardless of the press-fit attachment of the filter box. There is an effect that the attenuation characteristic of the attenuation band is not deteriorated and the transmission output is not lowered.

図１には、本発明の実施例に係る雑音抑圧フィルタ内蔵伝送装置の構成（導波管の矩形短辺部側から見た図）が示され、図２には、フィルタ箱の構成が示されている。図１において、実施例の伝送装置は、矩形の導波管部（マイクロストリップ線路−導波管変換部）１０の開口部に、フィルタ箱１２を嵌合配置する構成とされ、この導波管部１０の開口部には、フィルタ箱１２を嵌合させる空間部分にインピーダンスステップ１４を介して短絡面１５が形成される。また、導波管部１０の上面側にマイクロストリップ線路１６が形成されており、このマイクロストリップ線路１６から導波管伝送路内へ向けてプローブ１７が貫通・配置される。   FIG. 1 shows the configuration of a transmission device with a built-in noise suppression filter according to an embodiment of the present invention (viewed from the rectangular short side of the waveguide), and FIG. 2 shows the configuration of the filter box. Has been. In FIG. 1, the transmission apparatus of the embodiment is configured such that a filter box 12 is fitted and disposed in an opening of a rectangular waveguide section (microstrip line-waveguide conversion section) 10. In the opening of the portion 10, a short-circuit surface 15 is formed through an impedance step 14 in a space portion in which the filter box 12 is fitted. Further, a microstrip line 16 is formed on the upper surface side of the waveguide unit 10, and a probe 17 is penetrated and arranged from the microstrip line 16 into the waveguide transmission path.

一方、図２に示されるように、フィルタ箱１２は、上記導波管部１０の矩形開口部の嵌合部分に嵌合する大きさの直方体の箱で、その前面（導波管部１０の矩形開口に対応する面）を開口１２ａとしており、この開口１２ａの外周に、フランジ（つば状部）１２ｂが設けられている。また、このフィルタ箱１２の後面、即ち導波管伝送路の伝送方向に直交する面には、従来と同様に、その一部に例えば形状、寸法を調整した開口を形成したフィルタ１２Ｆが設けられる。   On the other hand, as shown in FIG. 2, the filter box 12 is a rectangular parallelepiped box having a size that fits into the fitting portion of the rectangular opening of the waveguide portion 10. A surface corresponding to a rectangular opening) is an opening 12a, and a flange (rib portion) 12b is provided on the outer periphery of the opening 12a. Further, on the rear surface of the filter box 12, that is, the surface orthogonal to the transmission direction of the waveguide transmission path, a filter 12F having an opening whose shape and size are adjusted, for example, is provided in a part thereof as in the conventional case. .

そして、このフィルタ箱１２の上下面、即ち矩形開口１２ａ（導波管部１０の矩形開口でもある）の長辺側の２面のそれぞれにおいて、その長辺方向Ｇの中心部に、円形（正方形、長方形等、その他の形状でもよい）の貫通孔２０を設けており、実施例の貫通孔２０は、フィルタ箱１２外側面と導波管部１０内壁との隙間の中で電界が強い部分に設けられる。   Then, in each of the upper and lower surfaces of the filter box 12, that is, the two surfaces on the long side of the rectangular opening 12 a (which is also the rectangular opening of the waveguide portion 10), a circular (square) The through hole 20 of the embodiment may be formed in a portion where the electric field is strong in the gap between the outer surface of the filter box 12 and the inner wall of the waveguide portion 10. Provided.

図３には、フィルタ箱１２の上面（又は下面）と導波管部１０内部の上面（又は下面）との隙間の電界の強さ（矢印）を正面（開口部側）から見た図が示されており、この図３に示されるように、電界は、矩形開口長辺方向Ｇの中央部が最も強く、端部へ向かう程、弱くなる。そこで、実施例では、電界が最も強くなる中央部に貫通孔２０を設け、高次モード共振を効率よく抑圧している。   FIG. 3 is a diagram in which the electric field strength (arrow) in the gap between the upper surface (or lower surface) of the filter box 12 and the upper surface (or lower surface) inside the waveguide portion 10 is viewed from the front (opening side). As shown in FIG. 3, the electric field is strongest at the central portion in the long side direction G of the rectangular opening and becomes weaker toward the end portion. Therefore, in the embodiment, the through hole 20 is provided in the central portion where the electric field is strongest, and high-order mode resonance is efficiently suppressed.

このような実施例の構成によれば、図１に示されるように、導波管１０の内壁とフィルタ箱１２の外側面との僅かな隙間（図は、隙間を大きく描いている）に、高次モードが流入しても、その高次モードは貫通孔２０からフィルタ箱１２の伝送路内に戻され、またフランジ１２ｂの後面（フランジがないタイプでは、接続される他の部材）で反射された高次モードも、貫通孔２０からフィルタ箱１２内に戻され、分散される。従って、反射波（位相がずれた波等）によって生じる高次モードの共振が良好に抑圧される。   According to the configuration of such an embodiment, as shown in FIG. 1, the slight gap between the inner wall of the waveguide 10 and the outer surface of the filter box 12 (the drawing shows a large gap). Even if the higher order mode flows in, the higher order mode is returned from the through hole 20 into the transmission path of the filter box 12 and reflected by the rear surface of the flange 12b (or other member to be connected in the case of the type without the flange). The higher-order mode thus made is also returned from the through hole 20 into the filter box 12 and dispersed. Accordingly, higher-order mode resonances caused by reflected waves (such as out-of-phase waves) are satisfactorily suppressed.

図４には、実施例の雑音抑圧フィルタ内蔵伝送装置における伝送特性が示されており、通過特性は２０１、反射特性は２０２に示されるようになる。この通過特性２０１を図６の通過特性１０１と比較すると、受信帯域（Ｒｘ）において生じていた高次モード共振の影響部分（Ｅｑ）がなく、受信帯域（Ｒｘ）、送信帯域（Ｔｘ）共に、良好な特性が得られている。   FIG. 4 shows transmission characteristics in the transmission apparatus with a built-in noise suppression filter according to the embodiment, where 201 is the pass characteristic and 202 is the reflection characteristic. When this pass characteristic 201 is compared with the pass characteristic 101 of FIG. 6, there is no influence part (Eq) of higher-order mode resonance occurring in the reception band (Rx), and both the reception band (Rx) and the transmission band (Tx) Good characteristics are obtained.

上記実施例では、円形の貫通孔２０をフィルタ箱１２の矩形開口長辺側の上下面のそれぞれに１つずつ設けたが、この貫通孔２０は、上下面のそれぞれに複数個配置してもよく、またフィルタ箱１２の矩形開口短辺側となる左右側面に追加して配置してもよい。更に、フィルタ箱１２の上下面と左右面の壁を、箱の構造的強度が維持できる範囲で取り除き、前面開口１２ａの枠と後面フィルタ１２Ｆを４本の支柱部で支える構成とすることもできる（左右面を残し、上下面の壁を全て取り除いてもよい）。   In the above-described embodiment, one circular through hole 20 is provided on each of the upper and lower surfaces of the long side of the rectangular opening of the filter box 12. However, a plurality of through holes 20 may be arranged on each of the upper and lower surfaces. Alternatively, the filter box 12 may be additionally arranged on the left and right side surfaces on the short side of the rectangular opening. Further, the upper and lower surfaces and the left and right walls of the filter box 12 can be removed as long as the structural strength of the box can be maintained, and the frame of the front opening 12a and the rear filter 12F can be supported by four support columns. (You may remove all the walls on the top and bottom, leaving the left and right sides).

本発明の実施例に係る雑音抑圧フィルタ内蔵伝送装置の構成を示す断面図である。It is sectional drawing which shows the structure of the transmission apparatus with a built-in noise suppression filter based on the Example of this invention. 実施例のフィルタ箱の構成を示す斜視図である。It is a perspective view which shows the structure of the filter box of an Example. 実施例のフィルタ箱の上面（又は下面）と導波管内部の上面（又は下面）との隙間の電界の強さを正面（開口部側）から見た図である。It is the figure which looked at the intensity | strength of the electric field of the clearance gap between the upper surface (or lower surface) of the filter box of an Example, and the upper surface (or lower surface) inside a waveguide from the front (opening part side). 実施例の雑音抑圧フィルタ内蔵伝送装置の伝送特性（通過特性及び反射特性）を示す特性線図である。It is a characteristic diagram which shows the transmission characteristic (a transmission characteristic and a reflection characteristic) of the transmission apparatus with a built-in noise suppression filter of an Example. 従来のフィルタ内蔵伝送装置の構成を示し、図（Ａ）はフィルタ箱にフランジが設けられるタイプの断面図、図（Ｂ）はフランジがないタイプの断面図である。The structure of the conventional transmission apparatus with a built-in filter is shown, in which FIG. (A) is a sectional view of a type in which a filter box is provided with a flange, and FIG. 従来のフィルタ内蔵伝送装置の伝送特性（通過特性及び反射特性）を示す特性線図である。It is a characteristic diagram which shows the transmission characteristic (a transmission characteristic and reflection characteristic) of the conventional transmission apparatus with a built-in filter.

符号の説明Explanation of symbols

１，１０…導波管部、 ２，４，１２…フィルタ箱、
２ａ，１２ａ…開口、 ２ｂ，１２ｂ…フランジ、
２Ｆ，４Ｆ，１２Ｆ…フィルタ、
２０…貫通孔。 1,10 ... Waveguide part 2,4,12 ... Filter box,
2a, 12a ... opening, 2b, 12b ... flange,
2F, 4F, 12F ... filter,
20 ... through hole.

Claims (2)

矩形導波管伝送路の伝送方向に直交する面に伝送周波数帯域に減衰特性を持つフィルタが形成された直方体状のフィルタ箱を、上記導波管内に取り付ける雑音抑圧フィルタ内蔵伝送装置において、
上記フィルタ箱の上記導波管内壁側の面に貫通孔を設けたことを特徴とする雑音抑圧フィルタ内蔵伝送装置。 In the transmission device with a built-in noise suppression filter, a rectangular parallelepiped filter box in which a filter having attenuation characteristics in the transmission frequency band is formed on the surface orthogonal to the transmission direction of the rectangular waveguide transmission path,
A transmission device with a built-in noise suppression filter, wherein a through hole is provided in a surface of the filter box on the inner wall side of the waveguide. 上記貫通孔は、上記フィルタ箱の矩形開口長辺側の面で、その長辺方向中心部に設けたことを特徴とする請求項１記載の雑音抑圧フィルタ内蔵伝送装置。   The transmission device with a built-in noise suppression filter according to claim 1, wherein the through hole is provided in a central portion of a long side direction of a rectangular opening on a long side of the filter box.
JP2008177462A 2008-07-08 2008-07-08 Transmission device with built-in noise suppression filter Expired - Fee Related JP5091035B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950830A (en) * 2010-09-16 2011-01-19 深圳市大富科技股份有限公司 Cavity filter and manufacture method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295142A (en) * 1976-02-06 1977-08-10 Mitsubishi Electric Corp Low pass filter
JP2005333445A (en) * 2004-05-20 2005-12-02 New Japan Radio Co Ltd Transmitter with built-in reception band noise suppression filter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295142A (en) * 1976-02-06 1977-08-10 Mitsubishi Electric Corp Low pass filter
JP2005333445A (en) * 2004-05-20 2005-12-02 New Japan Radio Co Ltd Transmitter with built-in reception band noise suppression filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950830A (en) * 2010-09-16 2011-01-19 深圳市大富科技股份有限公司 Cavity filter and manufacture method thereof
CN101950830B (en) * 2010-09-16 2014-12-24 深圳市大富科技股份有限公司 Cavity filter and manufacture method thereof

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