JPH0597101U - Dielectric resonator - Google Patents
Dielectric resonatorInfo
- Publication number
- JPH0597101U JPH0597101U JP4342792U JP4342792U JPH0597101U JP H0597101 U JPH0597101 U JP H0597101U JP 4342792 U JP4342792 U JP 4342792U JP 4342792 U JP4342792 U JP 4342792U JP H0597101 U JPH0597101 U JP H0597101U
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- Prior art keywords
- conductor
- dielectric
- electrode
- facing
- resonator
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- 239000004020 conductor Substances 0.000 claims abstract description 54
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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Abstract
(57)【要約】
【目的】急峻な共振特性が得られる小型の誘電体共振器
を提供する。
【構成】誘電体１の内部に積層構造により伝送線路とな
る第１、第２の伝導体２Ａ、２Ｂを埋設する。第１の導
体、第２の導体２Ａ、２Ｂに誘電体層を介して対峙して
それぞれ分布容量を形成する第１、第２の対峙電極３
Ａ、３Ｂを設ける。第１の導体２Ａの一端部を誘電体１
の外面の端子電極４に接続し、かつ該第１の導体２Ａの
他端部を前記第１の対峙電極３Ａの端部に接続する。該
第１の対峙電極３Ａの前記第１の導体２Ａとの接続側端
部を前記第２の導体２Ｂの一端に接続する。前記第２の
対峙電極２Ｂを誘電体１の外面の接地電極５に接続す
る。ことにより、１つの積層部品内に相互に接続された
クローズタイプの共振器６とオープンタイプの共振器７
とを構成した。
(57) [Abstract] [Purpose] To provide a small-sized dielectric resonator capable of obtaining steep resonance characteristics. [Structure] First and second conductors 2A and 2B to be transmission lines are embedded in a dielectric 1 by a laminated structure. First and second facing electrodes 3 that face the first conductor and the second conductors 2A and 2B via a dielectric layer to form distributed capacitance, respectively.
A and 3B are provided. Connect one end of the first conductor 2A to the dielectric 1
Is connected to the terminal electrode 4 on the outer surface of the first conductor 2A, and the other end of the first conductor 2A is connected to the end of the first facing electrode 3A. An end portion of the first facing electrode 3A which is connected to the first conductor 2A is connected to one end of the second conductor 2B. The second facing electrode 2B is connected to the ground electrode 5 on the outer surface of the dielectric 1. As a result, a closed type resonator 6 and an open type resonator 7 are connected to each other in one laminated component.
And composed.
Description
【０００１】[0001]
本考案は、高周波用の電圧制御発振器やフィルタ等を構成する誘電体共振器に 関する。 The present invention relates to a dielectric resonator that constitutes a high-frequency voltage controlled oscillator, a filter, or the like.
【０００２】[0002]
誘電体共振器は、例えば自動車電話等の移動用無線機器、あるいは携帯電話等 の各種無線機器、またはこれらに組み込まれる電圧制御発振器やフィルタ等の構 成部品として広く用いられている。このような誘電体共振器は、従来、円筒形に 加工した誘電体セラミックに伝送線路用導体を塗布または電気めっきして形成す ることにより作製していた。 Dielectric resonators are widely used as mobile wireless devices such as car phones, various wireless devices such as mobile phones, and component parts such as voltage-controlled oscillators and filters incorporated therein. Conventionally, such a dielectric resonator has been manufactured by coating or electroplating a conductor for a transmission line on a dielectric ceramic processed into a cylindrical shape.
【０００３】 このような誘電体共振器において、急峻な共振特性を得るには複数個の共振器 を外付けコンデンサを介して組合わせる必要があり、このため、全体のサイズが 大型になるという問題点があった。In such a dielectric resonator, in order to obtain a sharp resonance characteristic, it is necessary to combine a plurality of resonators through an external capacitor, which results in a large size. There was a point.
【０００４】 本考案は、上記問題点に鑑み、急峻な共振特性が得られる小型の誘電体共振器 を提供することを目的とする。In view of the above problems, it is an object of the present invention to provide a small dielectric resonator that can obtain a sharp resonance characteristic.
【０００５】[0005]
この目的を達成するため、本考案は、誘電体の内部に積層構造により伝送線路 となる第１、第２の伝導体を埋設すると共に、第１の導体、第２の導体に誘電体 層を介して対峙してそれぞれ分布容量を形成する第１、第２の対峙電極を設け、 第１の導体の一端部を誘電体の外面の端子電極に接続し、かつ該第１の導体の他 端部を前記第１の対峙電極の端部に接続し、該第１の対峙電極の前記第１の導体 との接続側端部を前記第２の導体の一端に接続し、前記第２の対峙電極を誘電体 の外面の接地電極に接続することにより、１つの積層部品内に相互に接続された クローズタイプとオープンタイプの共振器を構成したことを特徴とする。 In order to achieve this object, the present invention embeds first and second conductors, which will be transmission lines, inside a dielectric by a laminated structure, and at the same time, a dielectric layer is formed on the first conductor and the second conductor. First and second facing electrodes that face each other to form a distributed capacitance are provided, one end of the first conductor is connected to the terminal electrode on the outer surface of the dielectric, and the other end of the first conductor is connected. Part is connected to the end of the first facing electrode, and the end of the first facing electrode connected to the first conductor is connected to one end of the second conductor, and the second facing electrode is connected. By connecting the electrode to the ground electrode on the outer surface of the dielectric, the closed type and open type resonators connected to each other are formed in one laminated component.
【０００６】[0006]
本考案の誘電体共振器は、上述の構造を有するものであって、２種のタイプの 共振器が１つの積層部品内に相互に接続されて設けられることにより、急峻な特 性が得られる。 The dielectric resonator of the present invention has the above-mentioned structure, and by providing two types of resonators connected to each other in one laminated component, a steep characteristic can be obtained. .
【０００７】[0007]
図１（Ａ）は本考案による誘電体共振器の一実施例を周囲の側面電極を付ける 前の状態で示す斜視図、（Ｂ）は側面電極を付けた状態で示す斜視図、（Ｃ）は その等価回路図である。また、図２（Ａ）、（Ｂ）はそれぞれ図１（Ｂ）のＥ− Ｅ、Ｆ−Ｆ断面図である。 FIG. 1 (A) is a perspective view showing an embodiment of a dielectric resonator according to the present invention before the surrounding side electrodes are attached, (B) is a perspective view showing the state with side electrodes attached, (C). Is an equivalent circuit diagram thereof. 2A and 2B are cross-sectional views taken along lines E-E and F-F of FIG. 1B, respectively.
【０００８】 図１、図２において、１はセラミックでなる誘電体、２Ａ、２Ｂはそれぞれ伝 送線路となる第１、第２の導体、３Ａ、３Ｂはそれぞれ第１、第２の導体２Ａ、 ２Ｂに誘電体１の層を介して対峙し、分布容量を形成する第１、第２の対峙電極 であり、本実施例においては、両対峙電極３Ａ、３Ｂは断面形状が矩形をなし、 中心にそれぞれ第１、第２の導体２Ａ、２Ｂが位置するように配設されている。 これらの導体２Ａ、２Ｂおよび対峙電極３Ａ、３Ｂは銅、銀、あるいは銀−パラ ジウム等によりなり、誘電体１と共に印刷法あるいはシート法により積層し、焼 成して形成される。本実施例においては、第１、第２の導体２Ａ、２Ｂは、積層 構造の異なる高さに形成されている。In FIGS. 1 and 2, reference numeral 1 is a dielectric made of ceramic, 2A and 2B are first and second conductors 3A and 3B, which are transmission lines, respectively, and first and second conductors 2A and 2A, respectively. 2A and 2B are first and second facing electrodes facing each other through a layer of the dielectric 1 to form a distributed capacitance. In the present embodiment, both facing electrodes 3A and 3B have a rectangular cross-sectional shape, and Are arranged so that the first and second conductors 2A and 2B are respectively located at. The conductors 2A and 2B and the facing electrodes 3A and 3B are made of copper, silver, silver-palladium, or the like, and are formed by stacking the dielectric 1 by a printing method or a sheet method and baking it. In this embodiment, the first and second conductors 2A and 2B are formed at different heights in the laminated structure.
【０００９】 第１の導体２Ａは、図１（Ａ）の中間製品においては、矩形に形成された誘電 体１の外面である一端面に露出させ、該露出部に図１（Ｂ）、図２（Ａ）に示す ように、ホット端子電極４を焼付けや電気めっきにより形成している。In the intermediate product of FIG. 1A, the first conductor 2A is exposed at one end surface which is the outer surface of the rectangular dielectric 1 and is exposed at the exposed portion as shown in FIG. As shown in FIG. 2A, the hot terminal electrode 4 is formed by baking or electroplating.
【００１０】 第１、第２の対峙電極３Ａ、３Ｂは、誘電体１内に埋設することにより、腐食 の防止と、他の部品等との接触による損傷の防止を図っている。第１の対峙電極 ３Ａは、第１の導体２Ａに対して垂直に形成されて第１の導体２Ａに接続された 接続部３ｘを有する。該接続部３ｘは、第２の導体２Ｂの一端に接続導体２ｙを 介してに接続され、第２の導体２Ｂの他端はオープンとなっている。第２の対峙 電極３Ｂは、その一部３ｚを引き出し電極として誘電体１の外部に露出させ、該 露出部に接続する接地端子電極５を焼付けや電気めっきにより形成している。こ れらの端子電極４、５も銅、銀あるいは銀−パラジウム等により形成される。対 峙電極３Ａ、３Ｂの長さは、共振周波数の波長の１／４の長さに形成される。By embedding the first and second facing electrodes 3A, 3B in the dielectric 1, corrosion is prevented and damage due to contact with other parts is prevented. The first facing electrode 3A has a connecting portion 3x that is formed perpendicularly to the first conductor 2A and is connected to the first conductor 2A. The connecting portion 3x is connected to one end of the second conductor 2B via the connecting conductor 2y, and the other end of the second conductor 2B is open. The second opposing electrode 3B has a part 3z thereof exposed as an extraction electrode to the outside of the dielectric 1, and a ground terminal electrode 5 connected to the exposed portion is formed by baking or electroplating. These terminal electrodes 4 and 5 are also formed of copper, silver, silver-palladium or the like. The opposing electrodes 3A and 3B are formed to have a length of 1/4 of the wavelength of the resonance frequency.
【００１１】 図１（Ｃ）に示すように、この誘電体共振器は、おおよそ、第１、第２の導体 ２Ａ、２ＢがインダクタンスＬ1 、Ｌ2 成分を形成する。また、導体２Ａと対峙 電極３Ａとその間の誘電体１とで容量Ｃ1 成分を形成し、これらによりクローズ タイプの共振器６を構成する。また、第２の導体２Ｂと対峙電極３Ｂとその間の 誘電体１とで容量Ｃ2 成分を形成し、これらにより、前記クローズタイプの共振 器６に接続されたオープンタイプの共振器７を構成する。As shown in FIG. 1C, in the dielectric resonator, the first and second conductors 2A and 2B form inductances L1 and L2 components. The conductor 2A, the facing electrode 3A, and the dielectric 1 between them form a capacitance C1 component, which constitutes a closed-type resonator 6. The second conductor 2B, the facing electrode 3B and the dielectric 1 between them form a capacitance C2 component, which constitutes an open type resonator 7 connected to the closed type resonator 6.
【００１２】 この共振器は印刷法またはシート法により、順次所定の厚み毎に積層後、多数 個どりの場合は切断した後、焼成することにより、図１（Ａ）に示す中間製品を 得、その後、端子電極４、５を焼付けあるいは電気めっきして図１（Ｂ）に示す 製品とする。This resonator is sequentially laminated by a printing method or a sheet method to have a predetermined thickness, and when a large number of pieces are cut, the resonator is cut and baked to obtain an intermediate product shown in FIG. Then, the terminal electrodes 4 and 5 are baked or electroplated to obtain the product shown in FIG.
【００１３】 このように、導体２Ａ、２Ｂを伝送線路とする２個の共振器を、１つの積層部 品で小型に実現することが可能となる。また、２個の共振器が接続されて、急峻 な共振特性のものを得ることができる。As described above, it is possible to realize two resonators having the conductors 2A and 2B as transmission lines in a small size with one laminated component. In addition, two resonators are connected to each other to obtain a steep resonance characteristic.
【００１４】 また、本考案において、対峙電極３Ａ、３Ｂは表裏面に露出した構造としても よいが、本実施例においては、対峙電極３Ａ、３Ｂを誘電体層により覆っている ので、対峙電極３Ａ、３Ｂの腐食を防止でき、しかもこの腐食防止構造が、共振 器作製のための印刷法やシート法による一連の工程で容易に実現できる。Further, in the present invention, the facing electrodes 3A, 3B may be exposed on the front and back surfaces, but in this embodiment, since the facing electrodes 3A, 3B are covered with the dielectric layer, the facing electrodes 3A, 3A. The corrosion of 3B can be prevented, and this corrosion prevention structure can be easily realized by a series of steps by a printing method or a sheet method for manufacturing a resonator.
【００１５】 図３、図４は本実施例の共振器を印刷法により製造する場合の１積層部品分に ついての工程図である。この例では、図１、図２の上側部分から積層して製造す る例について示しており、まず、図３（ａ）に示すように、誘電体１ａを全面に ついて印刷した後、（ｂ）に示すように、第１の対峙電極３Ａの上面部３ａの印 刷を行い、その後、第１の対峙電極３Ａの側面部３ｂおよび前記接続部３ｘとな る導体の印刷（ｃ）と、その周囲の誘電体１ｂの印刷（ｄ）とを、所定の厚みに なるまで交互に繰り返す。次に第１の導体２Ａ、前記側面部３ｂおよび前記接続 部３ｘとなる導体の印刷（ｅ）を行う。その後、周囲の誘電体１ｂの印刷（ｆ） と、第１の対峙電極３Ａの側面部３ｂおよび前記接続部３ｘとなる導体の印刷（ ｇ）とを、所定の厚みになるまで交互に繰り返す。その後、第１の対峙電極３Ａ の下面部３ｃの印刷（ｈ）を行い、これにより、クローズタイプの共振器６の部 分の積層を完了する。次に前記第２の導体２Ｂと第１の対峙電極３Ａとの接続導 体２ｙの印刷（ｉ）と、その周囲の誘電体１ｃの印刷（ｊ）とを、接続導体２ｙ の厚みが所定の値となるまで繰り返す。FIG. 3 and FIG. 4 are process diagrams of one laminated component when the resonator of this embodiment is manufactured by a printing method. In this example, an example of manufacturing by stacking from the upper portion of FIGS. 1 and 2 is shown. First, as shown in FIG. 3A, after printing the dielectric 1a on the entire surface, ), The upper surface portion 3a of the first facing electrode 3A is printed, and then the side surface portion 3b of the first facing electrode 3A and the conductor to be the connecting portion 3x are printed (c), The printing (d) of the surrounding dielectric 1b is alternately repeated until a predetermined thickness is reached. Next, printing (e) of the conductors that will become the first conductor 2A, the side surface portion 3b, and the connection portion 3x is performed. After that, the printing (f) of the surrounding dielectric 1b and the printing (g) of the side surface portion 3b of the first facing electrode 3A and the conductor to be the connection portion 3x (g) are alternately repeated until a predetermined thickness is obtained. Then, the printing (h) of the lower surface portion 3c of the first facing electrode 3A is performed, thereby completing the lamination of the portion of the closed type resonator 6. Next, the printing (i) of the connecting conductor 2y between the second conductor 2B and the first facing electrode 3A and the printing (j) of the dielectric 1c around the connecting conductor 2y are performed with a predetermined thickness of the connecting conductor 2y. Repeat until the value is reached.
【００１６】 次に図４（ａ）に示すように、前記接続導体２ｙと第２の対峙電極３Ｂの上面 部３ｄの印刷（ａ）を行い、その後、第２の対峙電極３Ｂの側面部３ｅおよび接 続導体２ｙの周囲の誘電体１ｄの印刷（ｂ）と、該側面部３ｅおよび接続導体２ ｙの印刷（ｃ）とを、側面部３ｅの厚みが所定の値となるまで繰り返す。次に前 記第２の導体２Ｂと前記側面部３ｅの印刷（ｄ）を行った後、第２の対峙電極３ Ｂの側面部３ｅの周囲の誘電体１ｅの印刷（ｅ）と、該側面部３ｅの印刷（ｆ） とを、側面部３ｅの厚みが所定の値となるまで繰り返す。その後、前記第２の対 峙電極３Ｂの下面部３ｆおよび端子電極への引き出し電極３ｚの印刷（ｇ）を行 った後、これらを覆う誘電体層１ｆを印刷する（ｈ）。Next, as shown in FIG. 4A, the connecting conductor 2y and the upper surface 3d of the second facing electrode 3B are printed (a), and then the side surface 3e of the second facing electrode 3B is printed. The printing (b) of the dielectric 1d around the connecting conductor 2y and the printing (c) of the side surface portion 3e and the connecting conductor 2y are repeated until the thickness of the side surface portion 3e reaches a predetermined value. Next, after printing (d) the second conductor 2B and the side surface portion 3e, printing (e) of the dielectric 1e around the side surface portion 3e of the second facing electrode 3B and the side surface The printing (f) of the portion 3e is repeated until the thickness of the side surface portion 3e reaches a predetermined value. After that, the lower electrode 3f of the second facing electrode 3B and the lead electrode 3z are printed (g) on the terminal electrode, and then the dielectric layer 1f that covers them is printed (h).
【００１７】 上記実施例においては、１つの積層部品内に相互に接続された１組の共振器を 構成する例について説明したが、中心周波数が同じかまたは異なる複数組の共振 器を設けてもよい。また、クローズ、オープンの両タイプの２種の共振器を縦に 積層するのではなく、横ならびに形成してもよい。In the above embodiment, an example in which one set of resonators connected to each other is formed in one laminated component has been described, but a plurality of sets of resonators having the same or different center frequencies may be provided. Good. In addition, two types of resonators, both closed and open, may be formed side by side instead of vertically stacked.
【００１８】[0018]
本考案によれば、誘電体の内部に積層構造により、２種のタイプの共振器が１ つの積層部品内に相互に接続されて設けられることにより、小型でかつ共振特性 の急峻なものを得ることが可能となる。 According to the present invention, two types of resonators are connected to each other in a single laminated component by a laminated structure inside a dielectric, thereby obtaining a small-sized and sharp resonance characteristic. It becomes possible.
【図１】（Ａ）は本考案による誘電体共振器の一実施例
を中間製品の状態で示す斜視図、（Ｂ）は本実施例の全
体構成を示す斜視図、（Ｃ）はその等価回路図である。FIG. 1A is a perspective view showing an embodiment of a dielectric resonator according to the present invention in the state of an intermediate product, FIG. 1B is a perspective view showing the overall configuration of this embodiment, and FIG. It is a circuit diagram.
【図２】（Ａ）、（Ｂ）はそれぞれ図１（Ｂ）のＥ−
Ｅ、Ｆ−Ｆ断面図である。2A and 2B are respectively E- of FIG. 1B.
It is E, FF sectional drawing.
【図３】本実施例の製造工程の一部を示す図である。FIG. 3 is a diagram showing a part of the manufacturing process of the present embodiment.
【図４】本実施例の製造工程の残部を示す図である。FIG. 4 is a diagram showing the rest of the manufacturing process of the present embodiment.
１、１ａ〜１ｆ 誘電体 ２Ａ 第１の導体 ２Ｂ 第２の導体 ２ｙ 接続導体 ３Ａ 第１の対峙電極 ３Ｂ 第２の対峙電極 ３ａ、３ｄ 上面部 ３ｂ、３ｅ 側面部 ３ｃ、３ｆ 下面部 ３ｘ 接続部 ３ｚ 引き出し電極 ４ ホット端子電極 ５ 接地端子電極 ６ クローズタイプ共振器 ７ オープンタイプ共振器 1, 1a to 1f Dielectric 2A First conductor 2B Second conductor 2y Connection conductor 3A First facing electrode 3B Second facing electrode 3a, 3d Upper surface part 3b, 3e Side surface part 3c, 3f Lower surface part 3x Connection part 3z Lead electrode 4 Hot terminal electrode 5 Ground terminal electrode 6 Close type resonator 7 Open type resonator
Claims (1)
なる第１、第２の伝導体を埋設すると共に、第１の導
体、第２の導体に誘電体層を介して対峙してそれぞれ分
布容量を形成する第１、第２の対峙電極を設け、第１の
導体の一端部を誘電体の外面の端子電極に接続し、かつ
該第１の導体の他端部を前記第１の対峙電極の端部に接
続し、該第１の対峙電極の前記第１の導体との接続側端
部を前記第２の導体の一端に接続し、前記第２の対峙電
極を誘電体の外面の接地電極に接続することにより、１
つの積層部品内に相互に接続されたクローズタイプとオ
ープンタイプの共振器を構成したことを特徴とする誘電
体共振器。1. A first conductor and a second conductor, which are transmission lines, are embedded in a dielectric body by a laminated structure, and face the first conductor and the second conductor via a dielectric layer, respectively. First and second facing electrodes forming a distributed capacitance are provided, one end of the first conductor is connected to a terminal electrode on the outer surface of the dielectric, and the other end of the first conductor is connected to the first electrode. Connected to the end of the facing electrode, connecting the end of the first facing electrode with the first conductor to one end of the second conductor, and connecting the second facing electrode to the outer surface of the dielectric. 1 by connecting to the ground electrode of
A dielectric resonator comprising a closed type resonator and an open type resonator connected to each other in one laminated component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992043427U JP2578985Y2 (en) | 1992-05-29 | 1992-05-29 | Dielectric stripline resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992043427U JP2578985Y2 (en) | 1992-05-29 | 1992-05-29 | Dielectric stripline resonator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0597101U true JPH0597101U (en) | 1993-12-27 |
| JP2578985Y2 JP2578985Y2 (en) | 1998-08-20 |
Family
ID=12663406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992043427U Expired - Lifetime JP2578985Y2 (en) | 1992-05-29 | 1992-05-29 | Dielectric stripline resonator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2578985Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS642403A (en) * | 1987-06-24 | 1989-01-06 | Taiyo Yuden Co Ltd | Dielectric resonator |
| JPH02290303A (en) * | 1989-02-28 | 1990-11-30 | Sumitomo Metal Ind Ltd | High frequency dielectric component and its manufacture |
| JPH0372706A (en) * | 1989-08-11 | 1991-03-27 | Murata Mfg Co Ltd | Band-pass filter |
-
1992
- 1992-05-29 JP JP1992043427U patent/JP2578985Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS642403A (en) * | 1987-06-24 | 1989-01-06 | Taiyo Yuden Co Ltd | Dielectric resonator |
| JPH02290303A (en) * | 1989-02-28 | 1990-11-30 | Sumitomo Metal Ind Ltd | High frequency dielectric component and its manufacture |
| JPH0372706A (en) * | 1989-08-11 | 1991-03-27 | Murata Mfg Co Ltd | Band-pass filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2578985Y2 (en) | 1998-08-20 |
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