JPS61258502A - Microwave filter - Google Patents

Microwave filter

Info

Publication number
JPS61258502A
JPS61258502A JP10029085A JP10029085A JPS61258502A JP S61258502 A JPS61258502 A JP S61258502A JP 10029085 A JP10029085 A JP 10029085A JP 10029085 A JP10029085 A JP 10029085A JP S61258502 A JPS61258502 A JP S61258502A
Authority
JP
Japan
Prior art keywords
dielectric block
open end
shield plate
coaxial
coaxial resonators
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
Application number
JP10029085A
Other languages
Japanese (ja)
Inventor
Hiroaki Tanaka
裕明 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP10029085A priority Critical patent/JPS61258502A/en
Publication of JPS61258502A publication Critical patent/JPS61258502A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/201Filters for transverse electromagnetic waves
    • H01P1/205Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2056Comb filters or interdigital filters with metallised resonator holes in a dielectric block

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

PURPOSE:To obtain a microwave filter with excellent isolation characteristic by mounting a shield plate to an electrode for mounting the shield plate formed to an open end of a dielectric block so as to eliminate the coupling of coaxial resonators due to an electromagnetic wave leaked from the open end of the dielectric block. CONSTITUTION:A face opposing to a face formed with a short-circuit conductive film 19 of the dielectric block 15 becomes an open end 22 of coaxial resonators 21-1, 21-2.... Shield plate mounting electrodes 23-1, 23-2... connected to the conductive film 18 in the broadwise direction of the dielectric block 15 are formed between the coaxial resonators 21-1 and 21-2 of the open end 22, between the coaxial resonators 21-2 and 21-3, between ... and one end of the shield plates 24-1, 24-2... is soldered to the shield plate mounting electrodes 23-1, 23-2.... The other end of the shield plates 24-1, 24-2... is soldered to a case 14. The coupling between coaxial resonators part by one resonator or over due to the electromagnetic wave leaked from the open end 22 of the dielectric block 15 and the deterioration in the band pass characteristic of the microwave filter is prevented.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はマイクロ波領域においてバンドパスフィルタや
分波器等に使用されるマイクロ波フィルタに関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microwave filter used as a bandpass filter, a duplexer, etc. in the microwave region.

(従来技術) 従来、マイクロ波フィルタとしでは、たとえば第3図に
示すように、入力側同軸コネクタ1および出力側同軸コ
ネクタ2を有する金属のケース3内に、複数個の誘電体
同軸共振器4,4.・・・、4を収容するととも1こ、
」1記入力側同軸コネクタ1と出力側同軸コネクタ2と
の間の間隔よりもや・短く、はず一定幅を有する誘電体
板5の同一の主表面に所定の間隔をおいて電極6,6.
・・・、6を形成してなる結合基板7を収容し、これら
電極6゜6、・・・、6に夫々上記誘電体同軸共振器4
,4゜・・・I4の結合棒4a、4a+・・・、4aを
半田付けする一方、上記誘電体板5の一端に形成された
電極6aを入力側同軸コネクタ1の中心導体1aに、ま
た、上記誘電体板5の他端に形成された電極6bを出力
側同軸コネクタ2の中心導体2alこ夫々接続してなる
ものが周知である。
(Prior Art) Conventionally, a microwave filter has a plurality of dielectric coaxial resonators 4 inside a metal case 3 having an input side coaxial connector 1 and an output side coaxial connector 2, as shown in FIG. ,4. ..., it accommodates 4 and 1,
1 Electrodes 6, 6 are arranged at a predetermined interval on the same main surface of the dielectric plate 5, which has a constant width and is slightly shorter than the interval between the input side coaxial connector 1 and the output side coaxial connector 2. ..
. . , 6 are formed, and the dielectric coaxial resonators 4 are connected to these electrodes 6° 6, . . . , 6, respectively.
, 4°...I4, while soldering the connecting rods 4a, 4a+..., 4a, the electrode 6a formed on one end of the dielectric plate 5 is connected to the center conductor 1a of the input side coaxial connector 1, and It is well known that the electrode 6b formed on the other end of the dielectric plate 5 is connected to the center conductor 2al of the output side coaxial connector 2, respectively.

上記フィルタは、第4図1こ示すように、入力側同軸コ
ネクタ1の中心導体1aと出力側同軸コネクタ2の中心
導体2aとの間にて、誘電体板5上で相互に隣接する電
極6,6間に形成される静電容量C,C,・・・、Oを
結合容量として、誘電体同軸共振器4,4.・・・、4
を結合してなる等価回路を有する。
As shown in FIG. 4, the filter has electrodes 6 adjacent to each other on the dielectric plate 5 between the center conductor 1a of the input side coaxial connector 1 and the center conductor 2a of the output side coaxial connector 2. , 6, with the electrostatic capacitances C, C, . . . , O formed between the dielectric coaxial resonators 4, 4, . ..., 4
It has an equivalent circuit that combines the following.

上記のようなマイクロ波フィルタでは、各誘電体同軸共
振器4の結合棒4a75弓1き出されている開放端から
は電磁波がもれてお1)、一つの誘電体同軸共振器4か
らもれた電磁波が第5図に示すように、結合基板7の隣
接する電極6,6の間に形成される静電容量Cの池に、
一つおきもしくはそれ以上離れた電極6,6間に形成さ
れる浮遊容量C゛を通して他の誘電体同軸共振器4と結
合する。
In the microwave filter as described above, electromagnetic waves leak from the open end of each dielectric coaxial resonator 4 where the coupling rod 4a75 bow 1 is exposed (1), and even from one dielectric coaxial resonator 4. As shown in FIG. 5, the electromagnetic waves generated by
It is coupled to other dielectric coaxial resonators 4 through stray capacitance C' formed between electrodes 6, 6 which are spaced apart from each other or more.

この結合により、各誘電体同軸共振器4のアイソレーシ
ョンが悪化し、フィルタのバンドパス特性が劣化する。
This coupling deteriorates the isolation of each dielectric coaxial resonator 4 and deteriorates the bandpass characteristics of the filter.

このため、第3図のマイクロ波フィルタでは、隣接する
誘電体同軸共振器4,4の間にシールド板(図示せず。
Therefore, in the microwave filter of FIG. 3, a shield plate (not shown) is provided between the adjacent dielectric coaxial resonators 4, 4.

)を挿入し、上記浮遊容量C゛による結合をなくしてい
る。
) is inserted to eliminate the coupling due to the stray capacitance C'.

ところで、マイクロ波フィルタとしては、上記のように
、複数の誘電体同軸共振器4,4.・・・。
By the way, as a microwave filter, as mentioned above, a plurality of dielectric coaxial resonators 4, 4 . ....

4を結合基板7で結合したものの池に、具体的には図示
しないが、一つの誘電体ブロックに複数段の同軸共振器
か一体に形成されたものも使用されている。
Although not specifically shown in the drawings, a structure in which a plurality of coaxial resonators are formed integrally with a single dielectric block is also used.

この種のマイクロ波フィルタでは、一つの誘電体ブロッ
クに形成された複数段の同軸共振器のうち、隣接する同
軸共振器同志は誘電体ブロック内で相互に電磁的に結合
されるので、第3図のマイクロ波フィルタのような結合
基板7は不要で、この結合基板7の浮遊容量C゛による
同軸共振器同志の結合はない。しかしながら、二のタイ
プのマイクロ波フィルタにおいても、誘電体ブロックの
一つの面に形成された各同軸共振器の開放端からの電磁
波のもれがある。この電磁波のもれによって一つおトも
しくはそれ以」二部れた同軸共振器同志か結合し、これ
によI)マイクロ波フィルタのバンドパス特性が劣化す
る。
In this type of microwave filter, among multiple stages of coaxial resonators formed in one dielectric block, adjacent coaxial resonators are electromagnetically coupled to each other within the dielectric block. There is no need for a coupling board 7 like the microwave filter shown in the figure, and there is no coupling between the coaxial resonators due to the stray capacitance C' of this coupling board 7. However, even in the two types of microwave filters, electromagnetic waves leak from the open end of each coaxial resonator formed on one surface of the dielectric block. This leakage of electromagnetic waves causes coupling between one or more coaxial resonators, thereby degrading the bandpass characteristics of the microwave filter.

ところで、この種のマイクロ波フィルタでは、従来より
、誘電体ブロックの開放端からの電磁波のもれによる同
軸共振器の結合を防止し、バンドパス特性の劣化を防止
するようにしたものはなかった。
By the way, there has not been a conventional microwave filter of this type that prevents coupling of the coaxial resonator due to leakage of electromagnetic waves from the open end of the dielectric block and prevents deterioration of the bandpass characteristics. .

(発明の目的) 本発明は上記事情に鑑みてなされたものであって、一つ
の誘電体ブロックに形成された同軸共振器の開放端から
もれた電磁波による結合をなくした、アイソレーション
特性の良好なマイクロ波フィルタを提供することを目的
としている。
(Object of the Invention) The present invention has been made in view of the above circumstances, and has an isolation characteristic that eliminates coupling due to electromagnetic waves leaking from the open end of a coaxial resonator formed in one dielectric block. The purpose is to provide a good microwave filter.

(発明の構I#、) このため、本発明は、同軸共振器の開放端を構成しでい
る誘電体ブロックの面には誘電体ブロックの外側面に形
成された導電膜に導通するシールド板取付用電極が隣接
する同軸共振器の間に形成されており、上記シールド板
取付用電極にはシールド板か固定されていることを特徴
としている。
(Structure of the Invention I#) Therefore, the present invention provides a shield plate on the surface of the dielectric block constituting the open end of the coaxial resonator, which is electrically connected to the conductive film formed on the outer surface of the dielectric block. A mounting electrode is formed between adjacent coaxial resonators, and a shield plate is fixed to the shield plate mounting electrode.

すなわち、本発明は、誘電体ブロックの開放端に形成さ
れたシールド板取付用電極にシールド板を取り付けるこ
とにより、誘電体ブロックの開放端からもれる電磁波に
よる同軸共振器同志の結合をなくしたものである。
That is, the present invention eliminates coupling between coaxial resonators due to electromagnetic waves leaking from the open end of the dielectric block by attaching a shield plate to the shield plate attachment electrode formed at the open end of the dielectric block. It is.

(発明の効果) 本発明によれば、誘電体ブロックの開放端に設けられた
シールド板により誘電体ブロックの開放端からもれる電
磁波による同軸共振器同志の結合カナくするので、同軸
共振器のアイソレーション特性が良好なものとなり、マ
イクロ波フィルタのフィルタ特性の劣化が防止される。
(Effects of the Invention) According to the present invention, the shield plate provided at the open end of the dielectric block prevents the coaxial resonators from being coupled together by electromagnetic waves leaking from the open end of the dielectric block. The isolation characteristics become good, and the deterioration of the filter characteristics of the microwave filter is prevented.

(実施例) 以下、添付図面を参照しっ)本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

第1図に示すマイクロ波フィルタ11はステップドイン
ピーダンス型と呼ばれるもので、入力側同軸コネクタ1
2および出力側同軸フネクタ13を有する金属製のケー
ス14内に収容されている。
The microwave filter 11 shown in FIG. 1 is of a stepped impedance type, and the input side coaxial connector 1
2 and an output side coaxial connector 13.

上記マイクロ波フィルタ11は、たとえば酸化  “チ
タン系のセラミック誘電体からなる直方体状の誘電体ブ
ロック15に段付トの貫通孔16−1゜16−2.・・
・を設け、これら貫通孔1.6−1.16−2.・・・
の各内面に夫々導電膜17−1.17−2.・・を形成
するとともに、」1記貫通孔1G−1,16−2,・・
・を取1)囲む誘電体ブロック15の外側面に導電膜1
8を形成し、上記導電膜17−1,17−2,・・・と
導電膜18とを、短絡導電膜1つで相互に短絡するよう
にしたものである。
The microwave filter 11 has stepped through holes 16-1, 16-2, .
* are provided, and these through holes 1.6-1.16-2. ...
A conductive film 17-1, 17-2. . . , and the through holes 1G-1, 16-2, . . .
・1) Conductive film 1 on the outer surface of the surrounding dielectric block 15
8, and the conductive films 17-1, 17-2, . . . and the conductive film 18 are short-circuited to each other by one short-circuit conductive film.

上記誘電体ブロック15内には、貫通孔16−1.16
−2.・・・に対応して同軸共振器21−1゜21−2
.・・・が形成され、これら同軸共振器21−1.:2
1−2.・・は隣接するもの同志が誘電体ブロック15
内で電磁的に相互に結合している。
In the dielectric block 15, a through hole 16-1.16 is provided.
-2. Coaxial resonators 21-1゜21-2 correspond to ...
.. ... are formed, and these coaxial resonators 21-1. :2
1-2. . . . adjacent ones are dielectric blocks 15
are electromagnetically coupled to each other.

」−記誘電体ブロック15の短絡導電膜19か形成され
た面に対向する面か゛、」1記同軸共振器21−1.2
1−2.・・・の開放端22となっている。
"-The surface opposite to the surface on which the short-circuit conductive film 19 of the dielectric block 15 is formed," 1. The coaxial resonator 21-1.2
1-2. ... is an open end 22.

」1記開放端22の同軸共振器21−1と21−2との
間、同軸共振器21−2と21−3との間・・・には、
第2図に示すように、誘電体ブロック15の厚み方向に
導電膜18に接続されたシールド板取付用電極23−1
.23−2.・・・が形成され、これらシールド板取付
用電極23−1.23−2゜・・・には、シールド板2
4−1.21−2.・・・の各一端が夫々半田付けされ
ている。」1記シールド板241.24.−2.・・・
の各他端は、第1図に示すように、ケース]4に半田付
けされる。
"1. Between the coaxial resonators 21-1 and 21-2 of the open end 22, between the coaxial resonators 21-2 and 21-3...
As shown in FIG. 2, the shield plate mounting electrode 23-1 is connected to the conductive film 18 in the thickness direction of the dielectric block 15.
.. 23-2. ... are formed, and these shield plate mounting electrodes 23-1, 23-2°...
4-1.21-2. One end of each is soldered. ”1 Shield plate 241.24. -2. ...
The other ends of each are soldered to the case 4, as shown in FIG.

上記誘電体ブロック15の両端部に位置する同軸共振器
21−1および21−2は、誘電体ユニット25および
26に埋設された導線27および28によ1)、入力側
同軸コネクタ12および出力側同軸コネクタ13に静電
的に夫々結合される。
The coaxial resonators 21-1 and 21-2 located at both ends of the dielectric block 15 are connected to the coaxial connector 12 on the input side and the coaxial connector 12 on the output side by conducting wires 27 and 28 buried in the dielectric units 25 and 26. They are electrostatically coupled to coaxial connectors 13, respectively.

このような構成であれば、誘電体ブロック15の開放端
22からもれた電磁波によるーっ主たはそれ以」−離れ
た同軸共振器間の結合がなくなり、マイクロ波フィルタ
のバンドパス特性の劣化が防止される。
With this configuration, coupling between distant coaxial resonators caused by electromagnetic waves leaking from the open end 22 of the dielectric block 15 is eliminated, and the bandpass characteristics of the microwave filter are improved. deterioration is prevented.

本発明は、隣接する誘電体同軸共振器の結合度を調整す
るために、誘電体ブロックの隣接する誘電体同軸共振器
間に空洞を有するたとえば特開昭!’) 8−94.0
号公報に開示されているフィルタ等にも適用することも
できる。
In the present invention, a cavity is provided between adjacent dielectric coaxial resonators of a dielectric block in order to adjust the degree of coupling between adjacent dielectric coaxial resonators. ') 8-94.0
The present invention can also be applied to the filter etc. disclosed in the above publication.

また、本発明は、ステップドインピーダンス型1υ、外
のもの1こも適用することかできる。
Furthermore, the present invention can also be applied to stepped impedance type 1υ and other types.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係るマイクロ波フィルタの内部構造を
示す断面図、第2図は第1図のマイクロ=7− 波フィルタのシールド板の取付状態を示す斜視図、第3
図は従来のマイクロ波フィルタの内部構造を示す断面図
、第4図は第3図のマイクロ波フィルタの等価回路図、
第5図は第3図のマイクロ波フィルタを構成する誘電体
同軸共振器の浮遊容量による結合を示す説明図である。 11・・・マイクロ波フィルタ、  15・・・誘電体
ブロック、 21−1〜21−4・・・同軸共振器、2
2・・・開放端、  23−1〜23−3・・・シール
ド板取付用電極、  24−1〜24−3・・・シール
ド板。 特許出願人 株式会社村田製作所 代 理 人  弁理士 青  山  葆はが2名−8=
FIG. 1 is a sectional view showing the internal structure of the microwave filter according to the present invention, FIG. 2 is a perspective view showing how the shield plate of the microwave filter of FIG. 1 is attached, and FIG.
The figure is a sectional view showing the internal structure of a conventional microwave filter, and Figure 4 is an equivalent circuit diagram of the microwave filter in Figure 3.
FIG. 5 is an explanatory diagram showing coupling due to stray capacitance of the dielectric coaxial resonator constituting the microwave filter of FIG. 3. 11... Microwave filter, 15... Dielectric block, 21-1 to 21-4... Coaxial resonator, 2
2... Open end, 23-1 to 23-3... Electrode for attaching shield plate, 24-1 to 24-3... Shield plate. Patent applicant Murata Manufacturing Co., Ltd. Representative Patent attorney Aoyama Bohaga 2 people - 8 =

Claims (1)

【特許請求の範囲】[Claims] (1)一つの誘電体ブロックに少なくとも2段以上の同
軸共振器が一体に形成されてなるマイクロ波フィルタに
おいて、 同軸共振器の開放端を構成している誘電体ブロックの面
には誘電体ブロックの外側面に形成された導電膜に導通
するシールド板取付用電極が隣接する同軸共振器の間に
形成されており、上記シールド板取付用電極にはシール
ド板が取着されていることを特徴とするマイクロ波フィ
ルタ。
(1) In a microwave filter in which at least two or more stages of coaxial resonators are integrally formed in one dielectric block, the surface of the dielectric block constituting the open end of the coaxial resonator is A shield plate mounting electrode is formed between adjacent coaxial resonators and is electrically conductive to a conductive film formed on the outer surface of the coaxial resonator, and a shield plate is attached to the shield plate mounting electrode. microwave filter.
JP10029085A 1985-05-10 1985-05-10 Microwave filter Pending JPS61258502A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10029085A JPS61258502A (en) 1985-05-10 1985-05-10 Microwave filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10029085A JPS61258502A (en) 1985-05-10 1985-05-10 Microwave filter

Publications (1)

Publication Number Publication Date
JPS61258502A true JPS61258502A (en) 1986-11-15

Family

ID=14270050

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10029085A Pending JPS61258502A (en) 1985-05-10 1985-05-10 Microwave filter

Country Status (1)

Country Link
JP (1) JPS61258502A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0266003U (en) * 1988-11-07 1990-05-18
EP0731522A1 (en) * 1995-03-08 1996-09-11 Murata Manufacturing Co., Ltd. Dielectric filter
US5712604A (en) * 1994-09-27 1998-01-27 Murata Manufacturing Co., Ltd. Dielectric filter including at least one band elimination filter
WO2010080929A1 (en) * 2009-01-08 2010-07-15 Cts Corporation Duplex filter with recessed top pattern and cavity
US9030275B2 (en) 2008-12-09 2015-05-12 Cts Corporation RF monoblock filter with recessed top pattern and cavity providing improved attenuation
US9030272B2 (en) 2010-01-07 2015-05-12 Cts Corporation Duplex filter with recessed top pattern and cavity
US9030276B2 (en) 2008-12-09 2015-05-12 Cts Corporation RF monoblock filter with a dielectric core and with a second filter disposed in a side surface of the dielectric core

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0266003U (en) * 1988-11-07 1990-05-18
US5712604A (en) * 1994-09-27 1998-01-27 Murata Manufacturing Co., Ltd. Dielectric filter including at least one band elimination filter
EP0731522A1 (en) * 1995-03-08 1996-09-11 Murata Manufacturing Co., Ltd. Dielectric filter
US5742214A (en) * 1995-03-08 1998-04-21 Murata Manufacturing Co., Ltd. Dielectric filter having obliquely oriented stepped resonators
US8294532B2 (en) 2008-12-09 2012-10-23 Cts Corporation Duplex filter comprised of dielectric cores having at least one wall extending above a top surface thereof for isolating through hole resonators
US9030275B2 (en) 2008-12-09 2015-05-12 Cts Corporation RF monoblock filter with recessed top pattern and cavity providing improved attenuation
US9030276B2 (en) 2008-12-09 2015-05-12 Cts Corporation RF monoblock filter with a dielectric core and with a second filter disposed in a side surface of the dielectric core
WO2010080929A1 (en) * 2009-01-08 2010-07-15 Cts Corporation Duplex filter with recessed top pattern and cavity
GB2479108A (en) * 2009-01-08 2011-09-28 Cts Corp Duplex filter with recessed top pattern and cavity
US9030272B2 (en) 2010-01-07 2015-05-12 Cts Corporation Duplex filter with recessed top pattern and cavity

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