JPH0818306A - Dielectric filter - Google Patents
Dielectric filterInfo
- Publication number
- JPH0818306A JPH0818306A JP6146673A JP14667394A JPH0818306A JP H0818306 A JPH0818306 A JP H0818306A JP 6146673 A JP6146673 A JP 6146673A JP 14667394 A JP14667394 A JP 14667394A JP H0818306 A JPH0818306 A JP H0818306A
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- excitation
- phase
- input
- hole
- dielectric
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば、自動車電話、
携帯電話等の移動通信機器に使用される誘電体フィルタ
に関する。BACKGROUND OF THE INVENTION The present invention relates to, for example, a car telephone,
The present invention relates to a dielectric filter used in mobile communication devices such as mobile phones.
【０００２】[0002]
【従来の技術】誘電体ブロックを用いた従来の誘電体フ
ィルタには、例えば、図５に示すような構造のものがあ
る。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 A conventional dielectric filter using a dielectric block has, for example, a structure as shown in FIG. In the following figures, the dot-filled portion shows the visible portion (conductor non-forming portion) of the dielectric block.
【０００３】この誘電体フィルタは、図５に示すよう
に、誘電体ブロック１の対向する一対の端面１ａ，１ｂ
を貫通して、その内面に内導体３が形成された共振器孔
２、２が形成され、誘電体ブロック１の外面には外導体
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７、７が形成されている。As shown in FIG. 5, this dielectric filter has a pair of opposed end faces 1a, 1b of a dielectric block 1.
Through which a resonator hole 2 is formed with an inner conductor 3 formed on the inner surface thereof, an outer conductor 4 is formed on the outer surface of the dielectric block 1, and a pair of outer conductors 4 are formed at predetermined positions on the outer conductor 4. Input / output electrodes 7, 7 are formed.
【０００４】この誘電体フィルタは、各共振器孔２、２
毎に形成される２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７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Ｃｅにより外部結合を得ている。This dielectric filter has resonator holes 2 and 2 respectively.
It consists of two stages of resonators formed for each, and between each resonator,
So-called comb line coupling is performed by stray capacitance generated in the inner conductor non-forming portion formed on the open end face side, and external coupling is performed by external coupling capacitance Ce generated between the input / output electrode 7 and the corresponding inner conductor 3. Is getting
【０００５】そして、この誘電体フィルタを例えば２個
用いてアンテナ共用器を構成する場合、両フィルタの共
通入出力端となるアンテナ端とフィルタ間には相手側フ
ィルタの通過帯域での反射位相が開放（オープン）とな
るように、位相を調整するための分波回路が挿入され
る。この分波回路としては、容量素子、インダクタンス
素子等の集中定数素子、またはケーブル、ストリップラ
イン等の分布定数線路が用いられている。When an antenna duplexer is constructed by using, for example, two of these dielectric filters, there is a reflection phase in the pass band of the other filter between the antenna end, which is the common input / output end of both filters, and the filter. A demultiplexing circuit for adjusting the phase is inserted so as to be open. As the branching circuit, a lumped constant element such as a capacitance element or an inductance element, or a distributed constant line such as a cable or a strip line is used.
【０００６】[0006]
【発明が解決しようとする課題】上記のように、従来の
誘電体フィルタを用いてアンテナ共用器等を構成する場
合は、誘電体フィルタに付加して、コンデンサ、コイ
ル、ストリップライン等の位相調整用の部品を必要と
し、しかもそれらを基板に組み付けてはんだ付けする、
あるいは基板に形成する等の作業が必要となる。したが
って、小形化が困難であり、部品コスト、製造コストが
高くなるという問題があった。As described above, when a conventional dielectric filter is used to construct an antenna duplexer, etc., it is added to the dielectric filter to adjust the phase of capacitors, coils, strip lines, etc. Components are needed, and they are assembled on the board and soldered,
Alternatively, work such as forming on a substrate is required. Therefore, there is a problem that miniaturization is difficult, and component cost and manufacturing cost increase.
【０００７】すなわち、従来の誘電体フィルタでは、入
出力部での外部結合の度合いが決まると、その位相も決
まってしまい、外部結合及び位相を独立して設定するこ
とができず、所望の外部結合及び位相を同時に得ること
は困難であり、他のフィルタまたは外部回路との接続に
位相が関係する場合は、位相を調整するための別の部品
を付加する必要があった。That is, in the conventional dielectric filter, when the degree of external coupling at the input / output section is determined, its phase is also determined, and the external coupling and phase cannot be set independently, so that the desired external filter cannot be set. It is difficult to obtain the coupling and the phase at the same time, and when the phase is related to the connection with another filter or an external circuit, it is necessary to add another component for adjusting the phase.
【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、位相調整の
ための部品を付加することなく、入出力部での位相を所
望の値に設定することができ、よって、部品点数を削減
し、安価で、かつ小形化の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-mentioned problems of the conventional dielectric filter and to set the phase at the input / output unit to a desired value without adding a component for phase adjustment. Therefore, it is an object of the present invention to provide a dielectric filter that can be set to, and thus can be manufactured at a low cost and with a reduced number of parts.
【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形成し、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に外導体を形成
してなる誘電体フィルタにおいて、入出力段にあたる前
記共振器孔の隣に、その内部に内導体が形成された励振
孔を設け、所望の外部結合及び位相が得られるように、
前記励振孔の形成位置、形状、大きさを設定したことを
特徴とするものである。In order to achieve the above object, the invention according to claim 1 forms a resonator hole between a pair of opposed end faces of a dielectric block, and an inner surface of the resonator hole. In a dielectric filter comprising an inner conductor and an outer conductor formed on the outer surface of a dielectric block, next to the resonator hole corresponding to the input / output stage, an excitation hole having an inner conductor formed therein is provided. So that the desired outer coupling and phase are obtained,
It is characterized in that the formation position, shape and size of the excitation hole are set.
【００１０】請求項２に係る発明は、請求項１に係る発
明において、誘電体ブロックの一方端面、または該端面
及び側面に跨がって、前記励振孔の内導体と導通し外導
体と分離する入出力電極を形成したことを特徴とするも
のである。According to a second aspect of the present invention, in the invention according to the first aspect, the dielectric block is electrically connected to the inner conductor of the excitation hole and separated from the outer conductor across one end face or the end face and the side face. It is characterized in that an input / output electrode is formed.
【００１１】[0011]
【作用】請求項１に係る発明においては、励振孔とこの
隣の共振器孔との電磁界結合によりフィルタの外部結合
を得ることができ、励振孔の形成位置、形状、大きさを
変えることにより、所望の外部結合及び位相を設定する
ことができる。According to the first aspect of the invention, the external coupling of the filter can be obtained by the electromagnetic field coupling between the excitation hole and the resonator hole adjacent thereto, and the formation position, shape and size of the excitation hole can be changed. Can set the desired external coupling and phase.
【００１２】請求項２に係る発明においては、上記作用
に加え、励振孔の内導体に導通する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, the input / output electrodes electrically connected to the inner conductor of the excitation hole can be connected to the external circuit.
【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。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments thereof. 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.
【００１４】本発明の第１実施例である誘電体フィルタ
の構造を図１に示す。図１は開放側端面側からみた誘電
体フィルタの外観斜視図である。The structure of the dielectric filter according to the first embodiment of the present invention is shown in FIG. FIG. 1 is an external perspective view of the dielectric filter as viewed from the open end surface side.
【００１５】この実施例の誘電体フィルタは、図１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を貫通して、その内面にそれぞれ
内導体３が形成された２個の共振器孔２、２及び一対の
励振孔５、５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が形成されている。励振孔５、５は共
振器孔２、２のそれぞれの外側に形成され、短絡側端面
１ｂ及び一側面１ｃ（図において上面）に跨がって、励
振孔５、５の内導体３と導通し外導体４と分離する一対
の入出力電極７、７が形成されている。つまり、励振孔
５、５の内導体３、３は短絡側端面１ｂでは外導体４と
分離され、開放側端面１ａでは外導体４と導通してい
る。また、各共振器孔２、２の内導体３、３は、開放側
端面１ａではその近傍に内導体非形成部が設けられ、外
導体４と分離（開放）され、短絡側端面１ｂでは外導体
４と導通（短絡）している。In the dielectric filter of this embodiment, as shown in FIG. 1, a pair of opposed end faces 1a and 1b of a substantially rectangular parallelepiped dielectric block 1 are penetrated, and inner conductors 3 are formed on the inner faces thereof. The two resonator holes 2 and 2 and the pair of excitation holes 5 and 5 are formed, and the outer conductor 4 is formed on substantially the entire outer surface of the dielectric block 1. The excitation holes 5 and 5 are formed outside the resonator holes 2 and 2, respectively, and extend over the short-circuit side end face 1b and the one side face 1c (upper surface in the figure) to be electrically connected to the inner conductor 3 of the excitation holes 5 and 5. A pair of input / output electrodes 7, 7 that are separated from the outer conductor 4 are formed. That is, the inner conductors 3, 3 of the excitation holes 5, 5 are separated from the outer conductor 4 at the short-circuit side end face 1b and are electrically connected to the outer conductor 4 at the open side end face 1a. Further, the inner conductors 3 and 3 of each resonator hole 2 and 2 are provided with an inner conductor non-formation portion in the vicinity thereof on the open side end surface 1a, separated (opened) from the outer conductor 4, and external on the short-circuit side end surface 1b. It is electrically connected (short-circuited) with the conductor 4.
【００１６】この誘電体フィルタは、励振孔５とこれに
隣り合う共振器孔２とは電磁界結合され、この電磁界結
合により誘電体フィルタの入出力部の外部結合を得るよ
うに構成されており、入出力電極７、７は、単に外部回
路との接続のために形成されたものである。In this dielectric filter, the excitation hole 5 and the resonator hole 2 adjacent to the excitation hole 5 are electromagnetically coupled, and this electromagnetic field coupling is configured to obtain external coupling of the input / output portion of the dielectric filter. Therefore, the input / output electrodes 7 and 7 are formed merely for connection with an external circuit.
【００１７】そして、励振孔の形成位置、形状、内寸
（大きさ）を変えることにより、所望の外部結合及び位
相を設定することができる。すなわち、外部結合を一定
とした状態で、その位相を変えることができる。The desired external coupling and phase can be set by changing the formation position, shape, and inner size (size) of the excitation hole. That is, the phase can be changed while the external coupling is kept constant.
【００１８】以下に、励振孔の形成位置、形状等と外部
結合及び位相の関係を実験結果に基づいて説明する。The relationship between the formation position and shape of the excitation hole and the external coupling and phase will be described below based on experimental results.
【００１９】図２（ａ）〜（ｄ）は誘電体フィルタの励
振孔形成部近傍の概略断面図であり、励振孔５の形成位
置、形状等を変えて、励振孔５の内導体と外導体間に形
成される励振孔５の自己容量Ｃ11及び励振孔５と共振器
孔２の内導体間に形成される相互容量Ｃ12を設定する方
法を示す図である。2 (a) to 2 (d) are schematic cross-sectional views in the vicinity of the excitation hole forming portion of the dielectric filter, in which the formation position, shape, etc. of the excitation hole 5 are changed, and the inner conductor and the outside of the excitation hole 5 are changed. FIG. 6 is a diagram showing a method of setting the self-capacitance C 11 of the excitation hole 5 formed between the conductors and the mutual capacitance C 12 formed between the excitation hole 5 and the inner conductor of the resonator hole 2.
【００２０】図２（ａ）においては、励振孔５を上下の
いずれかの側（図において下側）によせて形成すること
により、自己容量Ｃ11を増やし相互容量Ｃ12を減らすよ
うにしており、図２（ｂ）及び（ｃ）においては、励振
孔５の形状を略楕円形状としその形成方向を変えること
により、自己容量Ｃ11及び相互容量Ｃ12をより多様に設
定できるようにしており、図２（ｄ）においては、励振
孔５の内径を大きくすることで、自己容量Ｃ11及び相互
容量Ｃ12をともに増やすようにしている。このように、
励振孔の形成位置、形状、大きさ等を変えることによ
り、自己容量Ｃ11、相互容量Ｃ12を変化させることがで
きる。In FIG. 2A, the excitation hole 5 is formed on either side of the upper and lower sides (lower side in the figure) to increase the self-capacitance C 11 and reduce the mutual capacitance C 12. 2B and 2C, the self-capacitance C 11 and the mutual capacitance C 12 can be set in various ways by making the shape of the excitation hole 5 substantially elliptical and changing its forming direction. Therefore, in FIG. 2D, the self-capacitance C 11 and the mutual capacitance C 12 are both increased by increasing the inner diameter of the excitation hole 5. in this way,
The self-capacitance C 11 and the mutual capacitance C 12 can be changed by changing the formation position, shape, size, etc. of the excitation hole.
【００２１】これらの容量Ｃ11、Ｃ12と外部結合の関
係、及び位相の関係を図３に示す。図３は、例えば、中
心周波数を８３６．５ＭＨｚとし、相手側フィルタの通
過帯域となる８６９〜８９４ＭＨｚ間の反射位相を測定
した結果の一例を示すものである。図３において、外部
結合をある値に一定とした場合の励振孔の自己容量Ｃ11
と相互容量Ｃ12の関係を△印で示し、この時の自己容量
Ｃ11と８６９ＭＨｚ、８９４ＭＨｚでの反射位相の関係
を○、●印で示す。FIG. 3 shows the relationship between these capacitors C 11 and C 12 and the external coupling, and the relationship between the phases. FIG. 3 shows an example of the result of measurement of the reflection phase between 869 and 894 MHz, which is the pass band of the counterpart filter, with the center frequency set to 836.5 MHz, for example. In FIG. 3, the self-capacitance C 11 of the excitation hole when the external coupling is fixed to a certain value
And the mutual capacitance C 12 are indicated by Δ, and the relation between the self-capacitance C 11 and the reflection phase at 869 MHz and 894 MHz at this time is indicated by ○ and ●.
【００２２】図３に示すように、励振孔の形成位置、形
状等を変えて自己容量Ｃ11と相互容量Ｃ12を変えること
により外部結合を一定とすることができ、かつ反射位相
を大きく変化させることができる。つまり、自己容量Ｃ
11と相互容量Ｃ12を共に小さくすることにより、外部結
合を一定としたままで、反射位相をより小さくする、す
なわち反射位相をオープンに近づけることができる。As shown in FIG. 3, the external coupling can be made constant by changing the self-capacitance C 11 and the mutual capacitance C 12 by changing the formation position and shape of the excitation hole, and the reflection phase can be greatly changed. Can be made. That is, the self capacity C
By making both 11 and the mutual capacitance C 12 small, the reflection phase can be made smaller, that is, the reflection phase can be close to open, while keeping the external coupling constant.
【００２３】このため、この誘電体フィルタを用いてア
ンテナ共用器を構成する場合、アンテナ端に対応する一
方の励振孔の形成位置、形状、大きさ等を変えて、相手
側フィルタの通過帯域での反射位相をオープンとするこ
とができるので、位相調整のための容量素子、インダク
タンス素子、またはストリップライン等の別部品を付加
することなくアンテナ共用器を容易に構成することがで
きる。つまり、この誘電体フィルタを２個、あるいはこ
の誘電体フィルタと図５に示す従来例の誘電体フィルタ
を用い、一方の入出力電極を直接接続するだけで、アン
テナ共用器を構成することができる。Therefore, when an antenna duplexer is constructed by using this dielectric filter, the formation position, shape, size, etc. of one excitation hole corresponding to the antenna end are changed so that the pass band of the partner filter is changed. Since the reflection phase of can be made open, the antenna duplexer can be easily configured without adding another component such as a capacitance element, an inductance element, or a strip line for phase adjustment. That is, an antenna duplexer can be constructed by using two of these dielectric filters or using this dielectric filter and the conventional dielectric filter shown in FIG. 5 and directly connecting one input / output electrode. .
【００２４】なお、アンテナ共用器に応用する場合に限
らず、外部回路との接続において、その入出力部の位相
を変える必要のある場合にも同様に位相調整のための別
の部品を付加することなく、外部回路との適正なマッチ
ングを得ることができる。Not only when applied to an antenna duplexer, but also when it is necessary to change the phase of the input / output section in connection with an external circuit, another component for phase adjustment is similarly added. It is possible to obtain a proper matching with an external circuit without any trouble.
【００２５】また、励振孔の形状は、任意の形状とすれ
ばよく、楕円、長方形、三角形等の断面形状であっても
よい。また、上記実施例では、２段の共振器からなる誘
電体フィルタにて説明したが、１段もしくは３段以上の
共振器からなる誘電体フィルタでもよい。The shape of the excitation hole may be any shape, and may be an elliptical shape, a rectangular shape, a triangular shape or the like. Further, in the above-described embodiment, the dielectric filter including the two-stage resonators is described, but a dielectric filter including one-stage or three-stage or more resonators may be used.
【００２６】次に、本発明の第２実施例に係るアンテナ
共用器の構造を図４に示す。図４は開放側端面側からみ
たアンテナ共用器の外観斜視図である。Next, FIG. 4 shows the structure of the antenna duplexer according to the second embodiment of the present invention. FIG. 4 is an external perspective view of the antenna duplexer viewed from the open end face side.
【００２７】この実施例に係るアンテナ共用器は、図４
に示すように、誘電体ブロック１の一対の端面１ａ，１
ｂを貫通して、５個の共振器孔２ａ〜２ｅが形成され、
共振器孔２ａ，２ｅの外側、及び共振器孔２ｂ，２ｃの
間には励振孔５ａ，５ｂ，５ｃが形成され、各共振器孔
２ａ〜２ｅ、各励振孔５ａ，５ｂ，５ｃの内面にはそれ
ぞれ内導体３が形成されている。誘電体ブロック１の外
面の略全面には外導体４が形成されている。短絡側端面
１ｂ及び一側面１ｃに跨がって、各励振孔５ａ，５ｂ，
５ｃの内導体３と導通し、外導体４と分離する３個の入
出力電極７ａ，７ｂ，７ｃが形成されている。つまり、
各励振孔５ａ，５ｂ，５ｃの内導体３は開放側端面１ａ
では外導体４と導通し、短絡側端面１ｂでは外導体４と
分離している。各共振器孔２ａ〜２ｅ内の内導体３は開
放側端面１ａ側では内導体非形成部により外導体４と分
離され、短絡側端面１ｂでは外導体４と導通している。The antenna duplexer according to this embodiment is shown in FIG.
, A pair of end faces 1a, 1 of the dielectric block 1
5 resonator holes 2a to 2e are formed through b.
Excitation holes 5a, 5b, 5c are formed outside the resonator holes 2a, 2e and between the resonator holes 2b, 2c, and are formed on the inner surfaces of the resonator holes 2a to 2e and the excitation holes 5a, 5b, 5c. Has an inner conductor 3 formed therein. An outer conductor 4 is formed on substantially the entire outer surface of the dielectric block 1. Each excitation hole 5a, 5b, straddling the short-circuit side end face 1b and the one side face 1c,
There are formed three input / output electrodes 7a, 7b, 7c that are electrically connected to the inner conductor 3 of 5c and separated from the outer conductor 4. That is,
The inner conductor 3 of each excitation hole 5a, 5b, 5c has an open end face 1a.
Is conductive with the outer conductor 4, and is separated from the outer conductor 4 at the short-circuit side end face 1b. The inner conductor 3 in each of the resonator holes 2a to 2e is separated from the outer conductor 4 by the inner conductor non-forming portion on the open side end face 1a side, and is electrically connected to the outer conductor 4 on the short side end face 1b.
【００２８】このアンテナ共用器は、共振器孔２ａ，２
ｂに対応する２つの共振器からなる送信フィルタ（また
は受信フィルタ）と、共振器孔２ｃ，２ｄ，２ｅに対応
する３つの共振器からなる受信フィルタ（または送信フ
ィルタ）とで構成されている。励振孔５ａ，５ｃと共振
器孔２ａ，２ｅ、励振孔５ｂとこれに隣り合う共振器孔
２ｂ，２ｃはそれぞれ電磁界結合され、この電磁界結合
により外部結合を得ている。共振器孔２ｂ，２ｃの間の
入出力電極７ｂは送信フィルタ及び受信フィルタの入出
力を共用するアンテナ電極である。This antenna duplexer has resonator holes 2a, 2
It is composed of a transmission filter (or a reception filter) including two resonators corresponding to b and a reception filter (or a transmission filter) including three resonators corresponding to the resonator holes 2c, 2d, and 2e. The excitation holes 5a and 5c and the resonator holes 2a and 2e, and the excitation hole 5b and the resonator holes 2b and 2c adjacent to the excitation holes 5b and 2c are electromagnetically coupled to each other, and external coupling is obtained by this electromagnetic field coupling. The input / output electrode 7b between the resonator holes 2b and 2c is an antenna electrode that shares the input and output of the transmission filter and the reception filter.
【００２９】そして、このアンテナ共用器では、両フィ
ルタの入出力を共用する励振孔５ｂの形成位置等を変え
ることにより、所望の外部結合を得るとともに、反射位
相を相手側フィルタの通過帯域でオープンとなるように
設定している。In this antenna duplexer, desired external coupling is obtained and the reflection phase is opened in the pass band of the counterpart filter by changing the formation position of the excitation hole 5b that shares the input and output of both filters. Is set so that
【００３０】このように、位相調整用の別部品を付加す
ることなく、励振孔の形成位置、形状等を変えることに
より、両フィルタのアンテナ端での位相を変えることが
できるので、１つの誘電体ブロックに２つの誘電体フィ
ルタを一体に形成して高性能なアンテナ共用器を構成す
ることができ、アンテナ共用器の小形化、低コストを図
ることができる。As described above, the phase at the antenna end of both filters can be changed by changing the formation position, shape, etc. of the excitation hole without adding a separate component for phase adjustment. It is possible to form a high-performance antenna duplexer by integrally forming two dielectric filters on the body block, and it is possible to reduce the size and cost of the antenna duplexer.
【００３１】なお、上記各実施例では、短絡側端面に入
出力電極を形成したもので説明したがこれに限るもので
はなく、開放側端面に入出力電極を形成したものでもよ
く、入出力電極の形状等も特に限定するものではない。
また、入出力電極を形成せずに、金属端子等を用いて外
部回路に接続するようにしてもよい。In each of the above embodiments, the input / output electrodes are formed on the short-side end face, but the present invention is not limited to this, and the input / output electrodes may be formed on the open-side end face. The shape and the like are not particularly limited.
Alternatively, a metal terminal or the like may be used to connect to an external circuit without forming the input / output electrodes.
【００３２】また、各共振器間の結合は内導体非形成部
に形成されるストレー容量による必要はなく、結合孔等
の他の結合手段を用いてもよく、開放側端面側における
各共振器孔の内導体と外導体との分離も、実施例に限る
ものではない。Further, the coupling between the resonators does not have to be due to the stray capacitance formed in the inner conductor non-forming portion, other coupling means such as coupling holes may be used, and the resonators on the open side end face side may be used. Separation of the inner conductor and the outer conductor of the hole is not limited to the embodiment.
【００３３】要するに、本発明は、誘電体フィルタの入
出力部に、その内部に導体が形成された励振孔を設け、
この励振孔の形成位置、形状、大きさを変えることによ
り所望の外部結合を得るとともに、所望の入出力部の位
相を得ることを特徴とするものであり、励振孔以外の他
の構成については、特に限定するものではない。In short, according to the present invention, the input / output portion of the dielectric filter is provided with an excitation hole having a conductor formed therein,
It is characterized in that desired external coupling is obtained by changing the formation position, shape, and size of the excitation hole, and the phase of the desired input / output section is obtained. It is not particularly limited.
【００３４】[0034]
【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、誘電体フィルタの入出力部に励振
孔を設け、この励振孔の形成位置、形状、大きさを適宜
設定することにより、所望の外部結合及び位相を得るこ
とができる。すなわち、本発明の誘電体フィルタを用い
れば、コンデンサ、コイル、ストリップライン等の位相
調整用部品を付加することなく、他の誘電体フィルタを
直接接続してアンテナ共用器等を構成することができる
ので、部品点数を削減することができ、よって、小形化
できるとともに、部品コスト、製造コストを大幅に低減
することができる。また、１つの誘電体ブロックに複数
の誘電体フィルタを一体に形成して容易にアンテナ共用
器を構成できるので、さらに小形化、低コスト化を実現
できる。As described above, according to the dielectric filter of the present invention, an excitation hole is provided at the input / output portion of the dielectric filter, and the formation position, shape, and size of this excitation hole are set appropriately. As a result, a desired outer coupling and phase can be obtained. That is, by using the dielectric filter of the present invention, an antenna duplexer or the like can be configured by directly connecting another dielectric filter without adding a phase adjusting component such as a capacitor, a coil, or a strip line. Therefore, it is possible to reduce the number of parts, and therefore, it is possible to reduce the size and significantly reduce the parts cost and the manufacturing cost. Further, since a plurality of dielectric filters can be integrally formed on one dielectric block to easily construct an antenna duplexer, further miniaturization and cost reduction can be realized.
【図１】本発明の第１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 a first embodiment of the present invention.
【図２】（ａ）〜（ｄ）は本発明の誘電体フィルタの励
振孔形成部近傍の概略断面図である。2A to 2D are schematic cross-sectional views in the vicinity of an excitation hole forming portion of the dielectric filter of the present invention.
【図３】本発明の誘電体フィルタの励振孔の自己容量と
相互容量の関係、及び自己容量と反射位相の関係を示す
図である。FIG. 3 is a diagram showing a relationship between self-capacitance and mutual capacitance of an excitation hole of a dielectric filter of the present invention, and a relationship between self-capacitance and reflection phase.
【図４】本発明の第２実施例に係るアンテナ共用器の外
観斜視図である。FIG. 4 is an external perspective view of an antenna duplexer according to a second embodiment of the present invention.
【図５】従来の誘電体フィルタの外観斜視図である。FIG. 5 is an external perspective view of a conventional dielectric filter.
１ 誘電体ブロック ２、２ａ〜２ｅ 共振器孔 ３ 内導体 ４ 外導体 ５、５ａ〜５ｃ 励振孔 ７、７ａ〜７ｃ 入出力電極 DESCRIPTION OF SYMBOLS 1 Dielectric block 2, 2a-2e Resonator hole 3 Inner conductor 4 Outer conductor 5, 5a-5c Excitation hole 7, 7a-7c Input / output electrode
Claims (2)
に共振器孔を形成し、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に外導体を形成してなる誘電
体フィルタにおいて、 入出力段にあたる前記共振器孔の隣に、その内部に内導
体が形成された励振孔を設け、所望の外部結合及び位相
が得られるように、前記励振孔の形成位置、形状、大き
さを設定したことを特徴とする誘電体フィルタ。1. A dielectric material comprising a resonator block, a resonator hole formed between a pair of opposing end faces, an inner conductor formed on the inner surface of the resonator hole, and an outer conductor formed on the outer surface of the dielectric block. In the body filter, an excitation hole having an inner conductor formed inside is provided next to the resonator hole corresponding to the input / output stage, and the position and shape of the excitation hole are formed so that desired external coupling and phase can be obtained. , A dielectric filter having a set size.
該端面及び側面に跨がって、前記励振孔の内導体と導通
し外導体と分離する入出力電極を形成したことを特徴と
する請求項１に記載の誘電体フィルタ。2. An input / output electrode, which is electrically connected to the inner conductor of the excitation hole and separated from the outer conductor, is formed on one end surface of the dielectric block or across the end surface and the side surface. Item 2. The dielectric filter according to item 1.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06146673A JP3123348B2 (en) | 1994-06-28 | 1994-06-28 | Dielectric filter |
| EP95401420.5A EP0688059B2 (en) | 1994-06-16 | 1995-06-16 | Dielectric filter |
| KR1019950016056A KR0147726B1 (en) | 1994-06-16 | 1995-06-16 | Dielectric filter |
| DE69524673T DE69524673T3 (en) | 1994-06-16 | 1995-06-16 | Dielectric filter |
| US08/783,074 US5905420A (en) | 1994-06-16 | 1997-01-15 | Dielectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06146673A JP3123348B2 (en) | 1994-06-28 | 1994-06-28 | Dielectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0818306A true JPH0818306A (en) | 1996-01-19 |
| JP3123348B2 JP3123348B2 (en) | 2001-01-09 |
Family
ID=15413024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06146673A Expired - Lifetime JP3123348B2 (en) | 1994-06-16 | 1994-06-28 | Dielectric filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3123348B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100343897B1 (en) * | 1998-09-08 | 2002-07-19 | 가부시키가이샤 무라타 세이사쿠쇼 | Dielectric filter, composite dielectric filter, antenna duplexer and communication apparatus |
| KR100353593B1 (en) * | 1998-11-13 | 2002-09-26 | 가부시키가이샤 무라타 세이사쿠쇼 | Dielectric filter, duplexer and communication apparatus |
| US6686813B2 (en) | 2000-12-19 | 2004-02-03 | Murata Manufacturing Co. Ltd. | Dielectric filter, dielectric duplexer, and communication apparatus |
| JP2022550163A (en) * | 2019-09-30 | 2022-11-30 | 華為技術有限公司 | Dielectric filters and communication devices |
-
1994
- 1994-06-28 JP JP06146673A patent/JP3123348B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100343897B1 (en) * | 1998-09-08 | 2002-07-19 | 가부시키가이샤 무라타 세이사쿠쇼 | Dielectric filter, composite dielectric filter, antenna duplexer and communication apparatus |
| KR100353593B1 (en) * | 1998-11-13 | 2002-09-26 | 가부시키가이샤 무라타 세이사쿠쇼 | Dielectric filter, duplexer and communication apparatus |
| US6686813B2 (en) | 2000-12-19 | 2004-02-03 | Murata Manufacturing Co. Ltd. | Dielectric filter, dielectric duplexer, and communication apparatus |
| JP2022550163A (en) * | 2019-09-30 | 2022-11-30 | 華為技術有限公司 | Dielectric filters and communication devices |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3123348B2 (en) | 2001-01-09 |
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