JPH0851301A - Dielectric filter - Google Patents

Dielectric filter

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Publication number
JPH0851301A
JPH0851301A JP18493694A JP18493694A JPH0851301A JP H0851301 A JPH0851301 A JP H0851301A JP 18493694 A JP18493694 A JP 18493694A JP 18493694 A JP18493694 A JP 18493694A JP H0851301 A JPH0851301 A JP H0851301A
Authority
JP
Japan
Prior art keywords
spurious
frequency
dielectric
dielectric filter
conductor
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
JP18493694A
Other languages
Japanese (ja)
Inventor
Atsushi Toda
淳 遠田
Hitoshi Tada
斉 多田
Hideyuki Kato
英幸 加藤
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 JP18493694A priority Critical patent/JPH0851301A/en
Publication of JPH0851301A publication Critical patent/JPH0851301A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To provide a dielectric filter which can easily adjust the resonance frequency (spurious frequency) of a TE mode without changing the form of a dielectric block and can improve a spurious characteristic. CONSTITUTION:Resonator holes 2a-2c where internal conductors 3 are formed in the inner surface by causing them pass through a pair of facing end surfaces 1a and 1b in the dielectric block 1 are formed. An external conductor 4 is formed on the whole external surface of the dielectric block 1. the Internal conductor non-forming parts 3a are provided near the openingside end surface 1a in the respective internal conductors 3. Input/output electrodes 5 are formed at the prescribed places of the external conductor 4, thus the filter is constituted. The spurious frequency of the TE mode is adjusted and the spurious characteristic is improved by deleting a part of the external conductor 4 on the opening- side end surface 1a and forming external conductor deletion parts 4a after the filter is constituted.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、誘電体ブロック内に共
振器孔を形成し、誘電体ブロックの外面に外導体を形成
してなる誘電体フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter having a resonator hole formed in a dielectric block and an outer conductor formed on the outer surface of the dielectric block.

【０００２】[0002]

【従来の技術】誘電体ブロック内に共振器孔が形成され
た従来の誘電体フィルタの構造を図４に示す。なお、以
下の図において、点塗り潰し部は、誘電体ブロックの素
地の見える部分（導体非形成部）を示す。2. Description of the Related Art FIG. 4 shows the structure of a conventional dielectric filter in which a resonator hole is formed in a dielectric block. In addition, in the following figures, the dot-filled portion indicates a portion where the base material of the dielectric block is visible (conductor non-formation portion).

【０００３】この誘電体フィルタは、図４に示すよう
に、略直方体形状の誘電体ブロック１の対向する一対の
端面１ａ、１ｂ間を貫通して、その内面に内導体３が形
成された３個の共振器孔２ａ，２ｂ，２ｃが形成され、
誘電体ブロック１の外面の略全面には外導体４が形成さ
れ、該外導体４の所定箇所に一対の入出力電極５、５が
形成されている。各内導体３、３、３は、共振器孔２
ａ，２ｂ，２ｃの一方の開口面１ａ（以下、開放側端面
と記す）では、その近傍に内導体の非形成部（以下、内
導体非形成部と記す）が設けられ外導体４と分離（開
放）され、他方の開口面１ｂ（以下、短絡側端面と記
す）では、外導体４と導通（短絡）している。As shown in FIG. 4, this dielectric filter has a substantially rectangular parallelepiped dielectric block 1 that penetrates between a pair of opposing end faces 1a and 1b, and an inner conductor 3 is formed on the inner face of the dielectric block. Individual resonator holes 2a, 2b, 2c are formed,
An outer conductor 4 is formed on substantially the entire outer surface of the dielectric block 1, and a pair of input / output electrodes 5 and 5 are formed at predetermined locations on the outer conductor 4. Each inner conductor 3, 3, 3 is a resonator hole 2
An inner conductor non-formation portion (hereinafter, referred to as an inner conductor non-formation portion) is provided in the vicinity of one opening surface 1a (hereinafter, referred to as an open side end surface) of a, 2b, 2c and separated from the outer conductor 4. (Open), and the other opening surface 1b (hereinafter referred to as a short-circuit side end surface) is electrically connected (short-circuited) with the outer conductor 4.

【０００４】この誘電体フィルタは、各共振器孔２ａ，
２ｂ，２ｃ毎に形成される３段の共振器からなり、各共
振器間は、開放側端面側に形成された内導体非形成部に
発生するストレー容量によりいわゆるコムライン結合さ
れ、入出力電極５とこれに対応する内導体３との間に発
生する外部結合容量により外部結合を得て構成されてい
る。This dielectric filter has resonator holes 2a,
The resonators are composed of three-stage resonators formed for each of 2b and 2c. Between the resonators, so-called comb line coupling is performed by stray capacitance generated in the inner conductor non-forming portion formed on the open end surface side, and the input / output electrodes are formed. External coupling is obtained by the external coupling capacitance generated between the inner conductor 3 and the corresponding inner conductor 3.

【０００５】通常、このような誘電体フィルタでは、基
本波としてＴＥＭモードを利用しているが、ＴＥＭモー
ド共振の他にＴＥモードの共振が発生し、このＴＥモー
ド共振周波数でのレスポンスはスプリアスとなる。つま
り、上記誘電体フィルタの周波数減衰特性は、図５に示
すように、ＴＥＭモードの基本周波数（以下、ｆｏと記
す）より高い周波数において、ＴＥモードのスプリアス
ＴＥ101 ，ＴＥ102 ，ＴＥ103 ，・・・を有している。Usually, in such a dielectric filter, the TEM mode is used as the fundamental wave, but TE mode resonance occurs in addition to the TEM mode resonance, and the response at this TE mode resonance frequency is spurious. Become. That is, as shown in FIG. 5, the frequency attenuation characteristic of the above dielectric filter has TE mode spurious components TE 101 , TE 102 , TE 103 , ... At a frequency higher than the fundamental frequency of the TEM mode (hereinafter referred to as fo). ··have.

【０００６】これらのＴＥモードのスプリアスレベルが
要求特性を満たさない場合があり、このスプリアス特性
の改善が必要となっている。The TE mode spurious level may not satisfy the required characteristics in some cases, and it is necessary to improve the spurious characteristics.

【０００７】[0007]

【発明が解決しようとする課題】ところが、上記従来の
誘電体フィルタにおいては、誘電体ブロックの形状が決
まれば、ＴＥモードの共振周波数（以下、スプリアス周
波数と記す）がほぼ決まってしまい、要求される（目的
とする）スプリアス特性を得るためには、誘電体ブロッ
クの外形寸法等を変更して対処していた。すなわち、要
求特性に応じて、その都度、誘電体ブロックの幅、厚
み、長さ等を変更して、ＴＥモードのスプリアス周波数
を調整（シフト）して、所定（要求）周波数帯域でのス
プリアスレベル（減衰量）の改善を行っていた。このよ
うに、従来の誘電体フィルタでは、ＴＥモードのスプリ
アス特性改善のために、その要求特性に応じて形状の異
なる誘電体ブロックを多数必要とし、誘電体ブロックの
共通化、標準化が困難であり、金型コスト等が高くな
り、生産性が低下し、よって、製造コストが高くなると
いう問題があった。However, in the above-mentioned conventional dielectric filter, if the shape of the dielectric block is determined, the resonance frequency of the TE mode (hereinafter, referred to as spurious frequency) is almost determined, which is required. In order to obtain the desired (target) spurious characteristics, the outer dimensions of the dielectric block and the like have been changed. That is, the width, thickness, length, etc. of the dielectric block are changed each time according to the required characteristics to adjust (shift) the TE mode spurious frequency, and the spurious level in the predetermined (required) frequency band is adjusted. (Attenuation) was improved. As described above, in the conventional dielectric filter, in order to improve the spurious characteristics of the TE mode, a large number of dielectric blocks having different shapes are required according to the required characteristics, and it is difficult to standardize and standardize the dielectric blocks. However, there has been a problem that the die cost and the like are increased, the productivity is lowered, and thus the manufacturing cost is increased.

【０００８】そこで、本発明の目的は、以上のような従
来の誘電体フィルタが持つ問題点を解消し、誘電体ブロ
ックの形状を変えることなく、容易にＴＥモードのスプ
リアス周波数を調整することができ、よって、スプリア
ス特性を改善することができる誘電体フィルタを提供す
ることにある。Therefore, an object of the present invention is to solve the above problems of the conventional dielectric filter and to easily adjust the TE mode spurious frequency without changing the shape of the dielectric block. Accordingly, it is an object of the present invention to provide a dielectric filter that can improve spurious characteristics.

【０００９】[0009]

【課題を解決するための手段】上記目的を達成するため
に、請求項１に係る発明は、誘電体ブロックの対向する
一対の端面間に共振器孔を設け、該共振器孔の内面に内
導体を形成し、誘電体ブロックの外面の略全面に外導体
を形成し、前記共振器孔の一方の開口面の近傍に内導体
の非形成部を設けてなる誘電体フィルタにおいて、前記
内導体の非形成部が設けられた側の端面の外導体の一部
を削除し、ＴＥモードのスプリアス周波数を調整したこ
とを特徴とするものである。In order to achieve the above object, the invention according to claim 1 provides a resonator hole between a pair of opposing end faces of a dielectric block, and an inner surface of the resonator hole is provided with an internal cavity. In the dielectric filter, a conductor is formed, the outer conductor is formed on substantially the entire outer surface of the dielectric block, and a non-formed portion of the inner conductor is provided in the vicinity of one opening surface of the resonator hole. Is characterized in that a part of the outer conductor on the end face on the side where the non-formation portion is provided is deleted to adjust the TE mode spurious frequency.

【００１０】請求項２に係る発明は、請求項１に係る発
明において、外導体の一部に内導体と容量結合する入出
力電極を設けたことを特徴とするものである。The invention according to claim 2 is characterized in that, in the invention according to claim 1, an input / output electrode for capacitively coupling with the inner conductor is provided in a part of the outer conductor.

【００１１】[0011]

【作用】請求項１に係る発明においては、内導体非形成
部が設けられた側の端面（開放側端面）に形成されてい
る外導体の一部を削除することにより、ＴＥモードの共
振周波数（スプリアス周波数）をずらすことができる。
すなわち、該外導体削除後のスプリアス周波数は、外導
体削除前のスプリアス周波数より低い周波数にシフトす
ることができるので、所定周波数でのスプリアスレベル
を要求レベル以下とすることができる。In the invention according to claim 1, a part of the outer conductor formed on the end face (open end face) on the side where the inner conductor non-formation portion is provided is deleted, whereby the TE mode resonance frequency is obtained. (Spurious frequency) can be shifted.
That is, the spurious frequency after removing the outer conductor can be shifted to a frequency lower than the spurious frequency before removing the outer conductor, so that the spurious level at the predetermined frequency can be set to be equal to or lower than the required level.

【００１２】請求項２に係る発明においては、上記作用
に加え、他の接続部品を用いることなく、入出力電極に
より外部回路と接続できる。According to the second aspect of the invention, in addition to the above operation, it is possible to connect to the external circuit by the input / output electrodes without using other connecting parts.

【００１３】[0013]

【実施例】以下、本発明をその実施例を示す図面に基づ
いて具体的に説明する。図において、従来例と同一部分
については同一符号を付す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. In the figure, the same parts as those in the conventional example are designated by the same reference numerals.

【００１４】本発明の一実施例である誘電体フィルタの
構造及びその周波数減衰特性を図１及び図２に示す。図
１は誘電体フィルタの外観斜視図であり、図２は図１に
示す誘電体フィルタの周波数減衰特性図である。なお、
図２において点線は従来例を示す。The structure of a dielectric filter according to an embodiment of the present invention and its frequency attenuation characteristic are shown in FIGS. 1 is an external perspective view of the dielectric filter, and FIG. 2 is a frequency attenuation characteristic diagram of the dielectric filter shown in FIG. In addition,
In FIG. 2, the dotted line shows a conventional example.

【００１５】図１に示すように、本実施例の誘電体フィ
ルタは、３つの共振器孔２ａ，２ｂ，２ｃが形成された
３段構成のフィルタであり、開放側端面１ａの数箇所
（図において、５箇所）に外導体４の削除部４ａ（以
下、外導体削除部と記す）が設けられている。この外導
体削除部４ａは、誘電体フィルタ構成後に、開放側端面
１ａに形成された外導体４の一部をリューター等で削り
落として形成される。なお、この時、外導体４とともに
誘電体を削り取ってもよい。外導体削除部４ａ以外の他
の構成については、従来例の図４に示したものと同様の
構成であり、その説明を省略する。As shown in FIG. 1, the dielectric filter of this embodiment is a three-stage filter in which three resonator holes 2a, 2b, 2c are formed. In the above, the removed portions 4a of the outer conductor 4 (hereinafter, referred to as outer conductor removed portions) are provided at five locations. The outer conductor removing portion 4a is formed by scraping off a part of the outer conductor 4 formed on the open-side end surface 1a with a router or the like after forming the dielectric filter. At this time, the dielectric may be scraped off together with the outer conductor 4. The configuration other than the outer conductor removing portion 4a is the same as that of the conventional example shown in FIG. 4, and the description thereof will be omitted.

【００１６】この構成においては、開放側端面１ａに外
導体削除部４ａが設けられているので、この誘電体フィ
ルタのＴＥモードのスプリアス周波数は、図２に示すよ
うに、外導体削除部４ａ形成前より低い周波数にシフト
することができる。この場合、その削除量を多くすれば
周波数シフトは大きくなり、また、その削除箇所により
その周波数シフト量が異なる。なお、共振器孔２ａ，２
ｂ，２ｃで形成される各共振器の共振器長は短絡側端面
１ｂから内導体非形成部３ａの寸法で決定されるので、
開放側端面１ａに外導体削除部４ａを設けても、基本波
（ＴＥＭモード）周波数ｆｏはほとんど変化することが
ない。In this structure, since the outer conductor removing portion 4a is provided on the open side end face 1a, the TE mode spurious frequency of this dielectric filter has the outer conductor removing portion 4a formed as shown in FIG. Can shift to lower frequencies than before. In this case, if the amount of deletion is increased, the frequency shift becomes large, and the amount of frequency shift differs depending on the deleted portion. In addition, the resonator holes 2a, 2
Since the resonator length of each resonator formed by b and 2c is determined by the dimension of the inner conductor non-forming portion 3a from the short-circuit side end face 1b.
Even if the outer conductor removing portion 4a is provided on the open side end face 1a, the fundamental wave (TEM mode) frequency fo hardly changes.

【００１７】つまり、上記外導体削除部４ａを設けるこ
とにより、スプリアスとなるＴＥモードの共振周波数を
調整（シフト）することができ、所定周波数帯域でのス
プリアスレベルを要求レベル以下とすることができる。That is, by providing the outer conductor removing portion 4a, it is possible to adjust (shift) the resonance frequency of the TE mode, which is a spurious, so that the spurious level in the predetermined frequency band can be set to the required level or less. .

【００１８】なお、上記外導体削除部４ａの形成位置、
形状、数は、上記実施例に限ることはなく、その形成位
置、形状、数等を適宜調整することにより、ＴＥモード
の共振周波数つまりスプリアス周波数のシフト量を容易
に変化させることができる。したがって、１つの誘電体
ブロックの形状で、多様なスプリアス特性の要求に対応
することができ、そのばらつきをも調整することができ
る。Incidentally, the formation position of the outer conductor removing portion 4a,
The shape and the number are not limited to those in the above-mentioned embodiment, but the shift amount of the resonance frequency of the TE mode, that is, the spurious frequency can be easily changed by appropriately adjusting the formation position, the shape, the number, and the like. Therefore, the shape of one dielectric block can meet various requirements for spurious characteristics, and the variation can be adjusted.

【００１９】また、上記実施例では、誘電体ブロック内
に複数の共振器孔を設けた誘電体フィルタで説明した
が、図３に示すように、誘電体ブロック１に１個の共振
器孔２を形成した１段の誘電体フィルタ（トラップ）に
も本発明を適用できる。図３に示す誘電体フィルタにお
いても、開放側端面１ａに外導体非形成部４ａを形成
し、その形成位置、形状等を変えることにより、ＴＥモ
ードのスプリアス周波数を調整することができる。Further, in the above embodiment, the dielectric filter having a plurality of resonator holes provided in the dielectric block has been described, but as shown in FIG. 3, one resonator hole 2 is provided in the dielectric block 1. The present invention can be applied to a one-stage dielectric filter (trap) formed with. Also in the dielectric filter shown in FIG. 3, the TE conductor spurious frequency can be adjusted by forming the outer conductor non-forming portion 4a on the open side end surface 1a and changing the formation position, the shape, and the like.

【００２０】また、上記各実施例では、外導体４の一部
に入出力電極５を形成しているが、これに限るものでは
なく、入出力電極を形成せずに、例えば、樹脂ピンまた
は金属端子等の接続端子を入出力段の共振器孔に挿入し
て外部回路に接続するようにしてもよい。Further, in each of the above embodiments, the input / output electrode 5 is formed on a part of the outer conductor 4, but the present invention is not limited to this. For example, a resin pin or A connection terminal such as a metal terminal may be inserted into the resonator hole at the input / output stage and connected to an external circuit.

【００２１】要するに、本発明は、開放側端面に外導体
が形成された誘電体フィルタにおいて、開放側端面の外
導体の一部を削除することにより、ＴＥモードのスプリ
アス特性を改善するものであり、他の構成については特
に限定するものではない。In summary, the present invention is to improve the TE mode spurious characteristics by deleting a part of the outer conductor on the open end face in the dielectric filter having the open conductor on the open end face. Other configurations are not particularly limited.

【００２２】[0022]

【発明の効果】以上説明したように、本発明に係る誘電
体フィルタによれば、開放側端面の外導体の一部を削り
取ることにより、ＴＥモードの共振周波数すなわちスプ
リアス周波数を低い周波数にシフトすることができ、所
定の周波数帯域でのスプリアスレベルを要求レベル以下
とすることができる。このため、誘電体ブロックの形
状、サイズを変えることなく、ＴＥモードのスプリアス
特性を改善することができ、誘電体ブロックの共通化、
標準化ができるので、金型コスト、部資材管理コストを
低減できるとともに、生産性が向上し、よって、製造コ
ストを低減することができる。As described above, according to the dielectric filter of the present invention, the resonance frequency of the TE mode, that is, the spurious frequency is shifted to a low frequency by scraping off a part of the outer conductor on the open side end face. Therefore, the spurious level in the predetermined frequency band can be set to the required level or lower. Therefore, the spurious characteristics of the TE mode can be improved without changing the shape and size of the dielectric block, and the dielectric block can be made common.
Since the standardization can be performed, the die cost and the material management cost can be reduced, and the productivity can be improved, so that the manufacturing cost can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例に係る誘電体フィルタの外観
斜視図である。FIG. 1 is an external perspective view of a dielectric filter according to an embodiment of the present invention.

【図２】図１に示す誘電体フィルタの周波数減衰特性図
である。FIG. 2 is a frequency attenuation characteristic diagram of the dielectric filter shown in FIG.

【図３】本発明の他の実施例に係る１段の誘電体フィル
タの外観斜視図である。FIG. 3 is an external perspective view of a one-stage dielectric filter according to another embodiment of the present invention.

【図４】従来の誘電体フィルタの外観斜視図である。FIG. 4 is an external perspective view of a conventional dielectric filter.

【図５】図４に示す誘電体フィルタの周波数減衰特性図
である。5 is a frequency attenuation characteristic diagram of the dielectric filter shown in FIG.

【符号の説明】[Explanation of symbols]

１ 誘電体ブロック ２、２ａ〜２ｃ 共振器孔 ３ 内導体 ３ａ 内導体非形成部 ４ 外導体 ４ａ 外導体削除部 ５ 入出力電極 DESCRIPTION OF SYMBOLS 1 Dielectric block 2, 2a-2c Resonator hole 3 Inner conductor 3a Inner conductor non-formation part 4 Outer conductor 4a Outer conductor removal part 5 Input / output electrode

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 誘電体ブロックの対向する一対の端面間
に共振器孔を設け、該共振器孔の内面に内導体を形成
し、誘電体ブロックの外面の略全面に外導体を形成し、
前記共振器孔の一方の開口面の近傍に内導体の非形成部
を設けてなる誘電体フィルタにおいて、 前記内導体の非形成部が設けられた側の端面の外導体の
一部を削除し、ＴＥモードのスプリアス周波数を調整し
たことを特徴とする誘電体フィルタ。1. A resonator hole is provided between a pair of opposing end faces of a dielectric block, an inner conductor is formed on an inner surface of the resonator hole, and an outer conductor is formed on substantially the entire outer surface of the dielectric block.
In a dielectric filter having an inner conductor non-formation portion provided near one opening surface of the resonator hole, a part of the outer conductor on the end face on the side where the inner conductor non-formation portion is provided is removed. , A dielectric filter having a TE mode spurious frequency adjusted. 【請求項２】 前記外導体の一部に前記内導体と容量結
合する入出力電極を設けたことを特徴とする請求項１に
記載の誘電体フィルタ。2. The dielectric filter according to claim 1, wherein an input / output electrode capacitively coupled to the inner conductor is provided on a part of the outer conductor.
JP18493694A 1994-08-05 1994-08-05 Dielectric filter Pending JPH0851301A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18493694A JPH0851301A (en) 1994-08-05 1994-08-05 Dielectric filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18493694A JPH0851301A (en) 1994-08-05 1994-08-05 Dielectric filter

Publications (1)

Publication Number Publication Date
JPH0851301A true JPH0851301A (en) 1996-02-20

Family

ID=16161948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18493694A Pending JPH0851301A (en) 1994-08-05 1994-08-05 Dielectric filter

Country Status (1)

Country Link
JP (1) JPH0851301A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100311809B1 (en) * 1998-11-19 2001-11-15 이형도 A dielectric filter
KR20020056754A (en) * 2000-12-29 2002-07-10 송재인 The dielectric filter
US6734765B2 (en) * 2001-04-10 2004-05-11 Murata Manufacturing Co. Ltd. Dielectric filter, dielectric duplexer, and communications equipment
KR100458514B1 (en) * 2001-04-10 2004-12-03 가부시키가이샤 무라타 세이사쿠쇼 Dielectric duplexer and communication apparatus
WO2013093976A1 (en) * 2011-12-22 2013-06-27 Nec Corporation Tunable resonant elements and filter based on these elements

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100311809B1 (en) * 1998-11-19 2001-11-15 이형도 A dielectric filter
KR20020056754A (en) * 2000-12-29 2002-07-10 송재인 The dielectric filter
US6734765B2 (en) * 2001-04-10 2004-05-11 Murata Manufacturing Co. Ltd. Dielectric filter, dielectric duplexer, and communications equipment
KR100458514B1 (en) * 2001-04-10 2004-12-03 가부시키가이샤 무라타 세이사쿠쇼 Dielectric duplexer and communication apparatus
WO2013093976A1 (en) * 2011-12-22 2013-06-27 Nec Corporation Tunable resonant elements and filter based on these elements

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