JPH07240602A - Dielectric filter - Google Patents

Dielectric filter

Info

Publication number
JPH07240602A
JPH07240602A JP3152294A JP3152294A JPH07240602A JP H07240602 A JPH07240602 A JP H07240602A JP 3152294 A JP3152294 A JP 3152294A JP 3152294 A JP3152294 A JP 3152294A JP H07240602 A JPH07240602 A JP H07240602A
Authority
JP
Japan
Prior art keywords
case
cavity
attached
side bush
lower plate
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.)
Granted
Application number
JP3152294A
Other languages
Japanese (ja)
Other versions
JP3493712B2 (en
Inventor
Masamichi Ando
正道 安藤
Taiyo Nishiyama
大洋 西山
Yutaka Motooka
豊 本岡
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 JP03152294A priority Critical patent/JP3493712B2/en
Publication of JPH07240602A publication Critical patent/JPH07240602A/en
Application granted granted Critical
Publication of JP3493712B2 publication Critical patent/JP3493712B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To provide an inexpensive dielectric filter having small insertion loss and good temperature characteristics by providing a case attachement part on the lower part of the flange of a case side bush. CONSTITUTION:To the cavity frame body 2 of a dielectric resonator, through the through holes of a cavity, cavity side bushes 4 and the case side bushes 5 are attached by screwing through toothed washers 6. The dielectric resonator to which the case side bushes 5 are attached is attached to a case lower plate 3 by inserting the case attachement parts of the case side bushes 5 to the through holes of the case lower plate 3 and tightening them by nuts. Characteristic adjustment screws such as a frequency adjustment screw 7 or a screw 8 for connection adjustment, etc., are screwed and attached to screw holes inside the case side bushes.

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、キャビティ内に誘電体
共振子を設けた誘電体共振器をケースに取り付けてなる
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 case in which a dielectric resonator having a dielectric resonator provided in a cavity is attached to a case.

【0002】[0002]

【従来の技術】従来の誘電体フィルタの構造を図3、図
4に示す。図3において、1は十字状に一体成型された
TM二重モード誘電体共振子、2は誘電体共振子1とと
もに一体成型した四角筒状のキャビティ枠体である。こ
のキャビティ枠体2の2つの開口面にはそれぞれ側板
(図示せず)が取り付けられる。キャビティ枠体2の外
面と2枚の側板の内面または外面にはAg等の導体が形
成され、キャビティ枠体2と2枚の側板とによってキャ
ビティが構成され、誘電体共振子2を内蔵した誘電体共
振器が構成されている。誘電体共振子2には周波数調整
ネジ7の誘電体棒7bが挿入される周波数調整孔1aが
形成されている。キャビティ枠体2の図における底面に
はキャビティ側ブッシュ4、4を挿入するための2つの
貫通孔が形成されている。
2. Description of the Related Art The structure of a conventional dielectric filter is shown in FIGS. In FIG. 3, reference numeral 1 is a TM double-mode dielectric resonator integrally molded in a cross shape, and 2 is a rectangular cylindrical cavity frame body integrally molded with the dielectric resonator 1. Side plates (not shown) are attached to the two opening surfaces of the cavity frame body 2, respectively. A conductor such as Ag is formed on the outer surface of the cavity frame body 2 and the inner surface or outer surface of the two side plates, and the cavity is formed by the cavity frame body 2 and the two side plates. A body resonator is constructed. The dielectric resonator 2 is formed with a frequency adjusting hole 1a into which the dielectric rod 7b of the frequency adjusting screw 7 is inserted. Two through holes for inserting the cavity side bushes 4, 4 are formed in the bottom surface of the cavity frame body 2 in the figure.

【0003】3はステンレス等の金属からなるケース下
板であり、キャビティ側の貫通孔に対応する位置にキャ
ビティ側ブッシュ4、4が挿通する貫通孔が形成されて
いる。キャビティ枠体2とケース下板3の間に歯付座金
6、6を入れ、ケース側ブッシュ5、5をキャビティ側
ブッシュ4、4に対し螺合させて、キャビティ枠体2の
底面部とケース下板3とを共に挟持し固定している。
Reference numeral 3 denotes a case lower plate made of metal such as stainless steel, and through holes through which the cavity side bushes 4 and 4 are inserted are formed at positions corresponding to the through holes on the cavity side. The toothed washers 6, 6 are inserted between the cavity frame body 2 and the case lower plate 3, and the case side bushes 5, 5 are screwed into the cavity side bushes 4, 4 so that the bottom surface part of the cavity frame body 2 and the case The lower plate 3 is clamped and fixed together.

【0004】そして、ケース側ブッシュ5、5の内周面
に螺合させて、周波数調整ネジ7あるいは結合調整用ネ
ジ8等の特性調整用ネジが取り付けられ、周波数調整、
結合調整後、ナット11でそれぞれ固定される。周波数
調整ネジ7は樹脂製のネジ部7aとネジ部7aの先端部
に取り付けた誘電体棒7bからなり、結合調整用ネジ8
は金属製である。ケース本体10はその開口周縁部をケ
ース下板3の周縁部でネジ12によりネジ止めされてい
る。
Then, a characteristic adjusting screw such as a frequency adjusting screw 7 or a coupling adjusting screw 8 is attached by being screwed on the inner peripheral surfaces of the case side bushes 5, 5, to adjust the frequency,
After the coupling adjustment, the nuts 11 are fixed. The frequency adjusting screw 7 comprises a resin screw portion 7a and a dielectric rod 7b attached to the tip of the screw portion 7a.
Is made of metal. The case main body 10 has its opening peripheral edge screwed to the peripheral edge of the case lower plate 3 with a screw 12.

【0005】図4は図3に示したキャビティ枠体2とケ
ース下板3を挟持し固定するブッシュ部分の構造を示す
部分拡大断面図である。図4に示すように、ケース側ブ
ッシュ5はAgメッキされた金属製の二重ネジとなって
おり、ケース側ブッシュ5の外周面のネジは樹脂製のキ
ャビティ側ブッシュ4と螺合することによりキャビティ
枠体2とケース下板3を挟持する。キャビティ枠体2と
ケース下板3との間に入れられた歯付座金6はAgメッ
キが施されたリング状の金属からなり、その内縁部には
上下に複数の凸部を形成する歯が形成され、キャビティ
枠体2の外面に形成された導電膜との導通性を確実に得
るとともに、機械的に安定に挟持するためのものであ
る。
FIG. 4 is a partially enlarged cross-sectional view showing the structure of a bush portion for sandwiching and fixing the cavity frame 2 and the case lower plate 3 shown in FIG. As shown in FIG. 4, the case-side bush 5 is a double screw made of Ag-plated metal, and the screw on the outer peripheral surface of the case-side bush 5 is screwed into the resin-made cavity-side bush 4. The cavity frame 2 and the case lower plate 3 are sandwiched. The toothed washer 6 inserted between the cavity frame 2 and the case lower plate 3 is made of Ag-plated ring-shaped metal, and the inner edge of the toothed washer 6 has teeth that form a plurality of vertically protruding portions. This is to ensure electrical continuity with the conductive film formed and formed on the outer surface of the cavity frame body 2 and to sandwich the mechanically and stably.

【0006】ケース側ブッシュ5の内部のネジ孔は周波
数調整ネジ7のネジ部7aあるいは結合調整用ネジ8と
螺合する。周波数調整ネジ7あるいは結合調整用ネジ8
を回転させ、所定の周波数あるいは結合度になった状態
でナット11を締め付けて、周波数調整ネジ7あるいは
結合用調整ネジ8を固定する。
The screw hole inside the case side bush 5 is screwed into the screw portion 7a of the frequency adjusting screw 7 or the coupling adjusting screw 8. Frequency adjustment screw 7 or coupling adjustment screw 8
Is rotated, and the nut 11 is tightened at a predetermined frequency or degree of coupling to fix the frequency adjusting screw 7 or the coupling adjusting screw 8.

【0007】[0007]

【発明が解決しようとする課題】ところが、上記従来例
の図4に示すような構造では、歯付座金が直接ケース下
板3に接触しており、誘電体共振器の外面すなわちキャ
ビティ枠体の外面の導体を流れる電流の一部が歯付座金
を介してケース下板に流れ出す。ケース下板は低導電率
のステンレス製であり、ケース下板の表面に流れる電流
の導体損によりこの誘電体フィルタの挿入損失が悪化す
るという問題があった。
However, in the structure as shown in FIG. 4 of the above-mentioned conventional example, the toothed washer is in direct contact with the case lower plate 3, and the outer surface of the dielectric resonator, that is, the cavity frame body. Part of the current flowing through the conductor on the outer surface flows out to the lower plate of the case via the toothed washer. The case lower plate is made of low-conductivity stainless steel, and there is a problem that the insertion loss of the dielectric filter is deteriorated by the conductor loss of the current flowing on the surface of the case lower plate.

【0008】また、誘電体共振器とケース下板との取り
付けは、キャビティ側ブッシュ及びケース側ブッシュを
同時に用いて行なわなければならず、特に複数個の誘電
体共振器をケース下板に取り付ける場合は、その作業性
が悪く製造工数が多くかかり製造コストが高くなるとい
う問題があった。
Further, the dielectric resonator and the case lower plate must be attached by using the cavity side bush and the case side bush at the same time. Especially, when a plurality of dielectric resonators are attached to the case lower plate. Has a problem in that its workability is poor and the number of manufacturing steps is large, resulting in a high manufacturing cost.

【0009】さらに、ケース側ブッシュのフランジでケ
ース下板が挟み込まれており、ケース側ブッシュの内周
面に螺合している特性調整用ネジがケース下板の温度変
化による変動により上下に変動し、周波数等のフィルタ
特性の温度特性が悪化するという問題もあった。
Further, the case lower plate is sandwiched between the flanges of the case side bush, and the characteristic adjusting screw screwed to the inner peripheral surface of the case side bush fluctuates up and down due to the temperature change of the case lower plate. However, there is a problem that the temperature characteristics of the filter characteristics such as frequency are deteriorated.

【0010】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、ケース側ブ
ッシュのフランジの下部にケース取付部を設けることに
より、安価で挿入損失の小さな温度特性の良好な誘電体
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 provide a case mounting portion under the flange of the case side bush, thereby making it inexpensive and having a small insertion loss. An object is to provide a dielectric filter having good temperature characteristics.

【0011】[0011]

【課題を解決するための手段】上記目的を達成するため
に、本発明の請求項1に係る発明は、キャビティ内に誘
電体共振子を収納した誘電体共振器を、そのいずれか一
方の内周面に螺合して特性調整用ネジが挿入されるキャ
ビティ側ブッシュ及びケース側ブッシュを用いてケース
に取り付けてなる誘電体フィルタにおいて、前記キャビ
ティの平面部及びケースの所定箇所に貫通孔を設け、前
記誘電体共振器のキャビティに、前記キャビティの貫通
孔に挿通してキャビティ側ブッシュとケース側ブッシュ
を螺合により取り付け、前記ケース側ブッシュが取り付
けられた誘電体共振器を、前記ケースの貫通孔にケース
側ブッシュのケース取り付け部を挿通しナットにより締
め付けして、ケースに取り付け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 of the present invention provides a dielectric resonator in which a dielectric resonator is housed in a cavity of either one of them. In a dielectric filter which is attached to a case using a cavity side bush into which a characteristic adjusting screw is inserted by being screwed onto the peripheral surface and a case side bush, a through hole is provided in a flat portion of the cavity and a predetermined position of the case. , The cavity of the dielectric resonator is inserted into the through hole of the cavity to attach the cavity side bush and the case side bush by screwing, and the case where the case side bush is attached to the dielectric resonator. The case-side bush is attached to the case by inserting the case-attaching portion of the case-side bush into the hole and tightening it with a nut.

【0012】請求項2に係る発明は、請求項1に係る発
明において、キャビティとケース側ブッシュ間に歯付座
金を入れたことを特徴とするものである。
The invention according to claim 2 is the invention according to claim 1, characterized in that a toothed washer is inserted between the cavity and the case side bush.

【0013】[0013]

【作用】上記の構成によれば、共振器のキャビティの表
面の導体を流れる電流は、ケース側ブッシュのフランジ
表面を通って流れるので、低導電率で導体損の大きなケ
ースの表面に流れる電流はほとんどなくなる。また、ケ
ース側ブッシュを共振器単体に取り付けた後で、このケ
ース側ブッシュ付き共振器単体をそれぞれケースに取り
付けることができる。さらに、ケース側ブッシュのフラ
ンジの下にケースが取り付けられ、温度変化によるケー
スの寸法変動が特性調整用ネジの上下変動に及ぼす影響
を低減できる。
According to the above construction, the current flowing through the conductor on the surface of the cavity of the resonator flows through the flange surface of the case side bush, so that the current flowing on the surface of the case with low conductivity and large conductor loss is It almost disappears. Further, after the case-side bush is attached to the resonator alone, the case-side bushed resonator alone can be attached to the case. Further, since the case is attached under the flange of the case side bush, it is possible to reduce the influence of the dimensional fluctuation of the case due to temperature change on the vertical fluctuation of the characteristic adjusting screw.

【0014】[0014]

【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、従来例と同一また
は相当する部分、同一機能のもの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 or corresponding parts and those having the same functions as those in the conventional example are designated by the same reference numerals.

【0015】本発明の一実施例に係る誘電体フィルタの
構造を図1及び図2に示す。図1は誘電体フィルタの側
板取り付け前の側面図であり、図2は図1のブッシュ部
分の構造を示す部分拡大断面図である。
The structure of the dielectric filter according to one embodiment of the present invention is shown in FIGS. 1 is a side view of the dielectric filter before mounting the side plate, and FIG. 2 is a partially enlarged sectional view showing the structure of the bush portion of FIG.

【0016】図1に示すように、本実施例の誘電体フィ
ルタは、キャビティ枠体2及び側板(図示せず)からな
るキャビティ内にTM二重モード誘電体共振子1を設け
た誘電体共振器を、ケース下板3及びケース本体10か
らなるケースに収納したものである。
As shown in FIG. 1, the dielectric filter of this embodiment is a dielectric resonator in which a TM dual mode dielectric resonator 1 is provided in a cavity composed of a cavity frame 2 and side plates (not shown). The container is housed in a case composed of the case lower plate 3 and the case body 10.

【0017】周波数調整ネジ7の誘電体棒7bの先端部
には、その外径が誘電体共振子1の周波数調整孔1aと
ほぼ同等のテフロン等の樹脂製ガイド7cが取り付けら
れている。このガイド7cは周波数調整ネジ7を調整固
定後、振動、衝撃等による特性変動を抑止するためのも
のでる。
At the tip of the dielectric rod 7b of the frequency adjusting screw 7, a resin guide 7c such as Teflon having an outer diameter substantially equal to that of the frequency adjusting hole 1a of the dielectric resonator 1 is attached. This guide 7c is for suppressing the characteristic variation due to vibration, impact, etc. after the frequency adjusting screw 7 is adjusted and fixed.

【0018】本実施例では、先ず、誘電体共振器のキャ
ビティ枠体2に歯付座金6を介してキャビティ側ブッシ
ュ4及びケース側ブッシュ5が螺合締め付けにより取り
付けられる。その後、ケース側ブッシュ5の下部に設け
られたケース取付部をケース下板3に挿通しロックナッ
ト9で螺合締め付けし、誘電体共振器をケース下板3に
取り付けている。
In this embodiment, first, the cavity side bush 4 and the case side bush 5 are attached to the cavity frame body 2 of the dielectric resonator through the toothed washer 6 by screwing. After that, the case mounting portion provided at the lower portion of the case side bush 5 is inserted into the case lower plate 3 and screwed and tightened with the lock nut 9 to attach the dielectric resonator to the case lower plate 3.

【0019】すなわち、本実施例に係る誘電体共振器の
キャビティ枠体2とケース下板3との取り付け構造は、
図2に拡大して示すような構造となっている。
That is, the mounting structure of the cavity frame 2 and the case lower plate 3 of the dielectric resonator according to this embodiment is as follows.
The structure is shown in an enlarged manner in FIG.

【0020】図2に示すように、本実施例のケース側ブ
ッシュ5は、Agメッキされた金属製の二重ネジ構造で
あり、フランジの下部にはケース取付部が設けられてい
る。そして、先ず、ケース側ブッシュ5のフランジの上
に歯付座金6を入れ、ケース側ブッシュ5の上部をキャ
ビティ枠体2の貫通孔に挿入し、キャビティ枠体2を挟
持するようにキャビティ側ブッシュ4とケース側ブッシ
ュ5を螺合締め付けする。
As shown in FIG. 2, the case side bush 5 of this embodiment has a double-screw structure made of Ag-plated metal, and a case mounting portion is provided at the bottom of the flange. Then, first, the toothed washer 6 is put on the flange of the case side bush 5, the upper part of the case side bush 5 is inserted into the through hole of the cavity frame 2, and the cavity side bush is clamped so as to sandwich the cavity frame 2. 4 and case side bush 5 are screwed together and tightened.

【0021】次に、ケース側ブッシュ5の下部のケース
取付部を、ケース下板3の貫通孔に挿入しロックナット
9で締め付けて、ケース下板3に誘電体共振器が固定さ
れる。
Next, the case mounting portion below the case side bush 5 is inserted into the through hole of the case lower plate 3 and tightened with the lock nut 9, so that the dielectric resonator is fixed to the case lower plate 3.

【0022】周波数調整ネジ7あるいは結合調整用ネジ
8等の特性調整用ネジはケース側ブッシュ5の内周面の
ネジ孔に螺合して挿入され、周波数および結合等調整後
ナット11で締め付けて固定されている。なお、ケース
下板3、ケース本体10は、ステンレス、アルミ、銅合
金、鉄等の金属が用いられる。
A characteristic adjusting screw such as the frequency adjusting screw 7 or the coupling adjusting screw 8 is screwed into a screw hole on the inner peripheral surface of the case side bush 5, and is tightened with a nut 11 after adjusting the frequency and the coupling. It is fixed. The case lower plate 3 and the case body 10 are made of metal such as stainless steel, aluminum, copper alloy, and iron.

【0023】他の構成については、従来例の図4で示し
たものと同様の構成であり、その説明を省略する。
The other structure is the same as that shown in FIG. 4 of the conventional example, and the description thereof is omitted.

【0024】以上のように、本実施例は、周波数調整ネ
ジ等を挿入し、かつ誘電体共振器をケース下板に取り付
けるケース側ブッシュを、従来のフランジの片側にのみ
ネジ部を有するものから、フランジの両側にネジ部を有
するものに変えたことを特徴としている。
As described above, in the present embodiment, the case side bush in which the frequency adjusting screw or the like is inserted and the dielectric resonator is attached to the case lower plate has the threaded portion only on one side of the conventional flange. The feature is that the flange has been changed to one having threaded portions on both sides.

【0025】この構造においては、Agメッキされた歯
付座金がAgメッキされた誘電体共振器の外面すなわち
キャビティ枠体の外面の導体を流れる電流は歯付座金お
よびAgメッキされたケース側ブッシュのフランジ表面
を通って流れるので、低導電率で導体損の大きなケース
下板の表面に流れる電流はほとんどなくなり、この誘電
体フィルタの挿入損失が大幅に改善される。本実施例の
構造により、例えば6段構成の900MHz帯TMモー
ド共用器では、従来例に比べ約0.2dBの挿入損失の
改善が確認されている。
In this structure, the current flowing through the conductor on the outer surface of the Ag-plated toothed washer on the outer surface of the Ag-plated dielectric resonator, that is, on the outer surface of the cavity frame is the toothed washer and the Ag-plated case side bush. Since it flows through the surface of the flange, almost no current flows on the surface of the case lower plate having low conductivity and large conductor loss, and the insertion loss of this dielectric filter is greatly improved. With the structure of the present embodiment, for example, in a 900-MHz band TM mode duplexer having a six-stage configuration, it has been confirmed that the insertion loss is improved by about 0.2 dB as compared with the conventional example.

【0026】また、ケース側ブッシュを共振器単体に取
り付けた後、このケース側ブッシュ付き共振器単体をケ
ース下板に取り付けることができ、その作業性を大幅に
向上できる。
Further, after the case side bush is attached to the resonator single body, the case side bushed resonator single body can be attached to the case lower plate, and the workability thereof can be greatly improved.

【0027】さらに、ケース下板はケース側ブッシュの
フランジの下に取り付けられており、温度変化によるケ
ース下板の寸法変動が周波数調整ネジ等の上下変動に及
ぼす影響は低減され、周波数等のフィルタ特性の温度特
性が改善される。
Further, since the case lower plate is attached below the flange of the case side bush, the influence of the dimensional fluctuation of the case lower plate on the vertical fluctuation of the frequency adjusting screw etc. due to temperature change is reduced, and the filter of the frequency etc. is reduced. The temperature characteristic of the characteristic is improved.

【0028】なお、上記実施例では、キャビティ枠体と
一体成型された十字状のTM二重モード誘電体共振子を
内蔵した誘電体共振器を例として説明したが、これに限
るものではなく、柱状の1つの誘電体共振子を内蔵した
もの、あるいは複数個の誘電体共振子を内蔵したもので
もよい。また、誘電体共振子は枠体と一体成型されたも
のに限ることはなく、誘電体共振子をAgペースト等で
キャビティ枠体に焼き付け接合したものでもよい。ま
た、キャビティ枠体も4枚のセラミック板をAgペース
ト等で焼き付け張り合わせしたものでもよい。また使用
モードもTMモードに限るものではない。
In the above-mentioned embodiment, the dielectric resonator incorporating the cross-shaped TM dual mode dielectric resonator integrally molded with the cavity frame is described as an example, but the invention is not limited to this. It may have one columnar dielectric resonator or a plurality of dielectric resonators. Further, the dielectric resonator is not limited to the one integrally molded with the frame body, and the dielectric resonator may be baked and bonded to the cavity frame body with Ag paste or the like. Further, the cavity frame body may also be formed by baking and pasting four ceramic plates with Ag paste or the like. Also, the usage mode is not limited to the TM mode.

【0029】また、上記実施例では、キャビティ側ブッ
シュの内周面のネジにケース側ブッシュを螺合させた構
造で説明したが、これに限ることはなく、ケース側ブッ
シュの内周面にキャビティ側ブッシュを螺合させた構造
でもよい。この場合は、キャビティ側ブッシュを二重ネ
ジ構造とし、キャビティ側ブッシュの内部のネジ孔に特
性調整用ネジを螺合する。
Further, in the above embodiment, the structure in which the case side bush is screwed into the screw on the inner peripheral surface of the cavity side bush has been described, but the present invention is not limited to this, and the cavity is formed on the inner peripheral surface of the case side bush. A structure in which the side bushes are screwed together may be used. In this case, the cavity side bush has a double screw structure, and the characteristic adjusting screw is screwed into the screw hole inside the cavity side bush.

【0030】また、従来例および本実施例では、ケース
下板に2段構成の1個の誘電体共振器を取り付けた状態
図で説明したが、通常、ケースに複数個の誘電体共振器
を取り付けてより多段構成の高性能な誘電体フィルタが
構成されている。
Further, in the conventional example and the present embodiment, description has been made with the state diagram in which one dielectric resonator having a two-stage structure is attached to the lower plate of the case, but normally, a plurality of dielectric resonators are provided in the case. A high-performance dielectric filter with a multi-stage structure is constructed by mounting.

【0031】[0031]

【発明の効果】以上説明したように、本発明に係る誘電
体フィルタよれば、共振器のキャビティの表面に流れる
電流が導体損の大きな金属製のケースの表面に流れるこ
とがほとんどなく、挿入損失を大幅に改善できる。ま
た、ケース側ブッシュを共振器単体に取り付けた後で、
このケース側ブッシュ付き共振器単体をそれぞれケース
下板に取り付けられるので、その取り付け作業性を大幅
に向上することができ、製造工数を低減できる。また、
温度変化によるケース下板の寸法変動の周波数調整ネジ
等の特性調整用ネジに及ぼす影響を低減でき、温度特性
を改善できる。
As described above, according to the dielectric filter of the present invention, the current flowing on the surface of the cavity of the resonator hardly flows on the surface of the metal case having a large conductor loss, and the insertion loss is small. Can be greatly improved. Also, after attaching the case side bush to the resonator unit,
Since each of the case-side bushed resonators can be attached to the case lower plate, the workability of the attachment can be significantly improved, and the number of manufacturing steps can be reduced. Also,
It is possible to reduce the influence of the dimensional variation of the case lower plate due to the temperature change on the characteristic adjusting screw such as the frequency adjusting screw and improve the temperature characteristic.

【0032】したがって、本発明によれば、製造コスト
を低減でき、安価で挿入損失の小さな温度特性の良好な
高品質の誘電体フィルタを得ることができる。
Therefore, according to the present invention, it is possible to reduce the manufacturing cost, obtain an inexpensive high quality dielectric filter having a small insertion loss and good temperature characteristics.

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

【図1】本発明の実施例に係る誘電体フィルタの構造を
示す側面図である。
FIG. 1 is a side view showing a structure of a dielectric filter according to an embodiment of the present invention.

【図2】図1の主要部(ブッシュ部)の部分拡大断面図
である。
FIG. 2 is a partially enlarged sectional view of a main part (bushing part) of FIG.

【図3】従来の誘電体フィルタの構造を示す側面図であ
る。
FIG. 3 is a side view showing the structure of a conventional dielectric filter.

【図4】図3の主要部(ブッシュ部)の部分拡大断面図
である。
4 is a partially enlarged sectional view of a main part (bushing part) of FIG.

【符号の説明】[Explanation of symbols]

1 誘電体共振子 1a 周波数調整孔 2 キャビティ枠体 3 ケース下板 4 キャビティ側ブッシュ 5 ケース側ブッシュ 6 歯付座金 7 周波数調整ネジ 7a ネジ部 7b 誘電体棒 7c 樹脂製ガイド 8 結合調整用ネジ 9 ロックナット 10 ケース本体 11 ナット 1 Dielectric Resonator 1a Frequency Adjustment Hole 2 Cavity Frame 3 Case Lower Plate 4 Cavity Side Bush 5 Case Side Bush 6 Toothed Washer 7 Frequency Adjustment Screw 7a Screw Part 7b Dielectric Rod 7c Resin Guide 8 Coupling Adjustment Screw 9 Lock nut 10 Case body 11 Nut

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 キャビティ内に誘電体共振子を収納した
誘電体共振器を、そのいずれか一方の内周面に螺合して
特性調整用ネジが挿入されるキャビティ側ブッシュ及び
ケース側ブッシュを用いてケースに取り付けてなる誘電
体フィルタにおいて、 前記キャビティの平面部及びケースの所定箇所に貫通孔
を設け、前記誘電体共振器のキャビティに、前記キャビ
ティの貫通孔に挿通してキャビティ側ブッシュとケース
側ブッシュを螺合により取り付け、前記ケース側ブッシ
ュが取り付けられた誘電体共振器を、前記ケースの貫通
孔にケース側ブッシュのケース取り付け部を挿通しナッ
トにより締め付けして、ケースに取り付けたことを特徴
とする誘電体フィルタ。
1. A cavity-side bush and a case-side bush in which a dielectric resonator having a dielectric resonator housed in a cavity is screwed onto one of the inner peripheral surfaces of the dielectric resonator and a characteristic adjusting screw is inserted. In a dielectric filter attached to a case using, a through hole is provided in a flat portion of the cavity and a predetermined position of the case, and the cavity of the dielectric resonator is inserted into the through hole of the cavity to form a cavity side bush. The case side bush was attached by screwing, and the dielectric resonator to which the case side bush was attached was inserted into the through hole of the case, the case attaching portion of the case side bush was tightened with a nut, and the case was attached to the case. A dielectric filter characterized by.
【請求項2】 前記キャビティとケース側ブッシュ間に
歯付座金を入れ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 a toothed washer is inserted between the cavity and the case side bush.
JP03152294A 1994-03-01 1994-03-01 Dielectric filter Expired - Lifetime JP3493712B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03152294A JP3493712B2 (en) 1994-03-01 1994-03-01 Dielectric filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03152294A JP3493712B2 (en) 1994-03-01 1994-03-01 Dielectric filter

Publications (2)

Publication Number Publication Date
JPH07240602A true JPH07240602A (en) 1995-09-12
JP3493712B2 JP3493712B2 (en) 2004-02-03

Family

ID=12333531

Family Applications (1)

Application Number Title Priority Date Filing Date
JP03152294A Expired - Lifetime JP3493712B2 (en) 1994-03-01 1994-03-01 Dielectric filter

Country Status (1)

Country Link
JP (1) JP3493712B2 (en)

Also Published As

Publication number Publication date
JP3493712B2 (en) 2004-02-03

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