JPH09232807A - Dual-band filter - Google Patents
Dual-band filterInfo
- Publication number
- JPH09232807A JPH09232807A JP4172696A JP4172696A JPH09232807A JP H09232807 A JPH09232807 A JP H09232807A JP 4172696 A JP4172696 A JP 4172696A JP 4172696 A JP4172696 A JP 4172696A JP H09232807 A JPH09232807 A JP H09232807A
- Authority
- JP
- Japan
- Prior art keywords
- input terminal
- resonance
- output terminal
- conductors
- dielectric substrate
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、通信用高周波フィ
ルタとして用いられ得る二つの伝送帯域をもつ二帯域フ
ィルタに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual band filter having two transmission bands which can be used as a high frequency filter for communication.
【０００２】[0002]
【従来の技術】従来、通信用高周波フィルタは、ある特
定の一つの伝送帯域をもつように構成されている。例え
ば特開昭59-147501号公報や特開昭60-32401号公報に
は、誘電体基板の一面に薄膜導体より形成され、互いに
電磁的に結合される複数の共振素子及びに入出力端子を
設けたものが開示されている。また特開昭64-73802号公
報には、誘電体シート上に金属箔パターンを形成したフ
ィルタ素子を複数枚重ねて構成した高周波フィルタが開
示されている。2. Description of the Related Art Conventionally, a high frequency filter for communication has been constructed so as to have one specific transmission band. For example, in JP-A-59-147501 and JP-A-60-32401, a plurality of resonant elements formed of a thin film conductor on one surface of a dielectric substrate and electromagnetically coupled to each other and input / output terminals are provided. The provided one is disclosed. Further, Japanese Patent Application Laid-Open No. 64-73802 discloses a high frequency filter formed by stacking a plurality of filter elements each having a metal foil pattern formed on a dielectric sheet.
【０００３】[0003]
【発明が解決しようとする課題】ところで、近年多種多
様な移動体通信の発展に伴い、複数の通信システムを一
つの端末装置に組み込んで利用しようとする試みがなさ
れてきている。このような場合、通常通信システム毎に
使用する伝送周波数帯域が異なるため、上述のような従
来提案されている高周波フィルタを用いると、伝送周波
数帯域毎のフィルタを組み込んだり、スイッチングＩＣ
などで切り替えて実施するようにしなければならず、そ
のために多数のスイッチングＩＣが必要となり、端末装
置が大型化したりコストアップが避けられないなどの問
題があった。このことは最近の小型、軽量化の要求に相
反することにもなり、実用化の際の障壁ともなってい
る。一方、一般にカプラと呼ばれる分岐機能をもつ部品
を使用して所望の伝送周波数帯域に分岐させることも公
知であるが、その場合には、分岐されることによりパワ
ーダウン（出力低下？）が生じるという問題がある。By the way, with the development of various mobile communications in recent years, attempts have been made to incorporate a plurality of communication systems into one terminal device for use. In such a case, since the transmission frequency band to be used is usually different for each communication system, if a conventionally proposed high frequency filter as described above is used, a filter for each transmission frequency band is incorporated or a switching IC is used.
Therefore, a large number of switching ICs are required, which causes problems such as an increase in the size of the terminal device and an inevitable increase in cost. This conflicts with the recent demand for smaller size and lighter weight, and is a barrier to practical use. On the other hand, it is also known that a component having a branching function, which is generally called a coupler, is used to branch to a desired transmission frequency band, but in that case, it is said that branching causes power down (output reduction?). There's a problem.
【０００４】そこで、本発明は、このような従来技術に
伴う問題点を解決するため、二つの伝送周波数帯域をも
つ二帯域フィルタを提供することを目的としている。Therefore, the present invention has an object to provide a two-band filter having two transmission frequency bands in order to solve the problems associated with the prior art.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明においては、誘電体基板に一つの入力端子
と二つの出力端子を設け、入力端子とそれぞれの出力端
子との間に複数の共振導体を設け、これらの二組の共振
導体の中心周波数が異なるように構成され、それにより
二つの伝送周波数帯域をもつフィルタが提供される。In order to achieve the above object, according to the present invention, one input terminal and two output terminals are provided on a dielectric substrate, and between the input terminal and each output terminal. A plurality of resonance conductors are provided, and the center frequencies of the two sets of resonance conductors are different from each other, thereby providing a filter having two transmission frequency bands.
【０００６】[0006]
【発明の実施の形態】本発明によれば、誘電体基板の相
対した主外表面の少なくとも一方に接地導体を設け、誘
電体基板の相対した端面の一方に隣接して入力端子を、
また他方の端面に隣接して第１、第２の二つの出力端子
を互いに離間して設け、入力端子と第１の出力端子との
間に広がる領域及び入力端子と第２の出力端子との間に
広がる領域に、それぞれ複数の共振導体を設け、入力端
子と第１の出力端子との間に設けた複数の共振導体と入
力端子と第２の出力端子との間に設けた複数の共振導体
とがそれぞれ異なる中心周波数をもつように構成したこ
とを特徴とする二帯域フィルタが提供される。本発明の
一つの実施の形態においては、接地導体は誘電体基板の
相対した主外表面の一方に設けられ、他方の主外表面上
には上記入力端子、第１、第２の出力端子及び各共振導
体が設けられ得る。また、各共振導体は互いに離間して
平行に配置され、入力端子と第１の出力端子との間に設
けた複数の共振導体における隣接共振導体の結合部の長
さが一定にされ、また入力端子と第２の出力端子との間
に設けた複数の共振導体における隣接共振導体の結合部
の長さは一定であり、かつ入力端子と第１の出力端子と
の間の隣接共振導体の上記結合部の長さと異なる。本発
明の別の実施の形態においては、入力端子は、誘電体基
板の一方の端面に対してほぼ直角にのび、第１、第２の
出力端子はそれぞれ誘電体基板の他方の端面に隣接して
ほぼ平行に誘電体基板のそれぞれの側面に向かっての
び、入力端子と第１の出力端子との間及び入力端子と第
２の出力端子の間にそれぞれ設けた複数の共振導体は屈
曲形状に配置され得る。これにより、低周波側フィルタ
と高周波側フィルタとの相互作用をさらによく避けるこ
とができるようになる。また本発明によれば、各共振導
体はストリップ形状またはマイクロストリップ形状に構
成され得る。さらに、本発明の別の実施の形態において
は、各共振導体はストリップ形状を成し、そして誘電体
基板内に形成され得る。これにより外部からの電磁波の
影響を受けににくできる。According to the present invention, a ground conductor is provided on at least one of opposite main outer surfaces of a dielectric substrate, and an input terminal is provided adjacent to one of opposite end surfaces of the dielectric substrate.
Further, adjacent to the other end face, two first and second output terminals are provided apart from each other, and a region extending between the input terminal and the first output terminal and an area between the input terminal and the second output terminal are provided. A plurality of resonance conductors are respectively provided in a region spread therebetween, and a plurality of resonance conductors provided between the input terminal and the first output terminal and a plurality of resonance conductors provided between the input terminal and the second output terminal. There is provided a two-band filter characterized in that the conductor and the conductor have different center frequencies. In one embodiment of the present invention, the ground conductor is provided on one of the opposing main outer surfaces of the dielectric substrate, and the input terminal, the first and second output terminals, and the above-mentioned input terminal are provided on the other main outer surface. Each resonant conductor may be provided. In addition, the respective resonance conductors are spaced apart from each other and arranged in parallel, the lengths of the coupling portions of the adjacent resonance conductors among the plurality of resonance conductors provided between the input terminal and the first output terminal are made constant, and The lengths of the coupling portions of the adjacent resonance conductors in the plurality of resonance conductors provided between the terminal and the second output terminal are constant, and the above-mentioned adjacent resonance conductors between the input terminal and the first output terminal are the same. Different from the length of the joint. In another embodiment of the present invention, the input terminal extends substantially at right angles to one end surface of the dielectric substrate, and the first and second output terminals respectively adjoin the other end surface of the dielectric substrate. Parallel to each side surface of the dielectric substrate, and the plurality of resonance conductors provided between the input terminal and the first output terminal and between the input terminal and the second output terminal are bent. Can be placed. As a result, the interaction between the low frequency side filter and the high frequency side filter can be better avoided. Further, according to the present invention, each resonance conductor may be formed in a strip shape or a microstrip shape. Furthermore, in another embodiment of the invention, each resonant conductor is strip-shaped and may be formed in a dielectric substrate. This makes it less susceptible to external electromagnetic waves.
【０００７】[0007]
【実施例】以下、添附図面を参照して本発明の実施例に
ついて説明する。図１には、本発明の一実施例を示し、
１は六面直方体形の誘電体基板で、この誘電体基板１の
相対した主外表面を成す上側面1a及び下側面1bと、前端
面1c及び後端面1dと、二つの側面1e、1fとを備えてい
る。誘電体基板１の上側面1aには、入力端子２がほぼ長
手方向中央軸線上に沿って誘電体基板１の前端面1cに隣
接して設けられている。また誘電体基板１の後端面1d隣
接した誘電体基板１の上側面1aの部分には両側面1e、1f
に沿って第１、第２の出力端子３、４がそれぞれ設けら
れている。誘電体基板１の上側面1a上の、入力端子２と
第１の出力端子３との間に広がる領域及び入力端子２と
第２の出力端子４との間に広がる領域には、それぞれ複
数の共振導体5a、5b、5c；6a、6b、6cがこれらの入出力
端子と実質的に平行にしかも互いに離間して設けられて
いる。入出力端子２、３、４及び各共振導体5a、5b、5
c；6a、6b、6cは厚膜または薄膜形成技術を用いてスト
リップまたはマイクロストリップ形状に形成され得る。
誘電体基板１の下側面1bには導体層７が形成され、接地
導体として機能する。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention,
Reference numeral 1 denotes a hexagonal rectangular parallelepiped-shaped dielectric substrate including an upper side surface 1a and a lower side surface 1b, which are main outer surfaces facing each other, a front end surface 1c and a rear end surface 1d, and two side surfaces 1e and 1f. Is equipped with. An input terminal 2 is provided on the upper side surface 1a of the dielectric substrate 1 adjacent to the front end face 1c of the dielectric substrate 1 substantially along the longitudinal center axis. In addition, the rear side surface 1d of the dielectric substrate 1 has both side surfaces 1e and 1f on the upper side surface 1a portion of the dielectric substrate 1 adjacent thereto.
A first output terminal 3 and a second output terminal 4 are provided along the line. A plurality of regions on the upper surface 1a of the dielectric substrate 1 extending between the input terminal 2 and the first output terminal 3 and a region extending between the input terminal 2 and the second output terminal 4 are provided. Resonant conductors 5a, 5b, 5c; 6a, 6b, 6c are provided substantially parallel to these input / output terminals and apart from each other. Input / output terminals 2, 3, 4 and resonance conductors 5a, 5b, 5
c; 6a, 6b, 6c can be formed into strip or microstrip shapes using thick film or thin film forming techniques.
A conductor layer 7 is formed on the lower surface 1b of the dielectric substrate 1 and functions as a ground conductor.
【０００８】図２に示すように、各共振導体の幅ａ及び
隣接共振導体間の間隔ｂは、意図するフィルタ特性すな
わち通過帯域幅及び減衰量等に応じて適当に設定するこ
とができる。また、入力端子２と第１の出力端子３との
間に設けた複数の共振導体5a、5b、5cにおける隣接共振
導体の結合部の長さc1、及び入力端子２と第２の出力端
子４との間に設けた複数の共振導体6a、6b、6cにおける
隣接共振導体の結合部の長さc2はそれぞれ一定にされ、
そしてこれら結合部の長さc1、c2は互いに異なる長さに
され、それにより低周波側フィルタと高周波側フィルタ
とが構成される。As shown in FIG. 2, the width a of each resonance conductor and the interval b between adjacent resonance conductors can be appropriately set in accordance with the intended filter characteristics, that is, the pass band width and the amount of attenuation. In addition, the length c1 of the coupling portion of the adjacent resonance conductors in the plurality of resonance conductors 5a, 5b, 5c provided between the input terminal 2 and the first output terminal 3, and the input terminal 2 and the second output terminal 4 The length c2 of the coupling portion of the adjacent resonance conductors in the plurality of resonance conductors 6a, 6b, and 6c provided between and is made constant,
The lengths c1 and c2 of these coupling portions are made different from each other, whereby a low frequency side filter and a high frequency side filter are configured.
【０００９】図３には、図１に示すフィルタの上側面1a
上に形成される入力端子２、第１の出力端子３、第２の
出力端子４及び共振導体5a、5b、5c、6a、6b、6cの実際
の相互配置例を拡大して示し、また図４には図３の共振
導体構成を用いた図１のフィルタ特性を示し、Ａは第１
の出力端子３に現れる波形を示し、17.2GHz帯のみ通過
させ、一方Ｂは第２の出力端子４に現れる波形を示し、
25GHz帯のみ通過させることが認められる。FIG. 3 shows the upper side surface 1a of the filter shown in FIG.
FIG. 3 is an enlarged view showing an example of an actual mutual arrangement of the input terminal 2, the first output terminal 3, the second output terminal 4 and the resonance conductors 5a, 5b, 5c, 6a, 6b, 6c formed on the above, and FIG. 4 shows the filter characteristics of FIG. 1 using the resonance conductor configuration of FIG. 3, where A is the first
Shows the waveform appearing at the output terminal 3 of the above, passing only the 17.2 GHz band, while B shows the waveform appearing at the second output terminal 4,
Only the 25GHz band is allowed to pass.
【００１０】図５には、本発明の変形実施例を示し、図
１と対応した部分は図１と同じ符号で示す。この場合に
は入力端子２は、図１の実施例の場合と同様に、ほぼ長
手方向中央軸線上に沿って誘電体基板１の前端面1cに隣
接して設けられているが、第１、第２の出力端子３、４
は、誘電体基板１の後端面1d隣接してそれと平行に誘電
体基板１のそれぞれの側面1e、1fに向かってのびるよう
に形成されている。そして入力端子２と第１の出力端子
３との間及び入力端子２と第２の出力端子４の間にそれ
ぞれ設けた複数の共振導体5a、5b、5c；6a、6b、6cは屈
曲形状に配置されている。このように構成することによ
り、第１、第２の出力端子３、４は互いにできるだけ遠
ざけて配置されることになり、出力端子同志の相互作用
が避けられることになる。FIG. 5 shows a modified embodiment of the present invention, and the portions corresponding to those in FIG. 1 are designated by the same reference numerals as those in FIG. In this case, the input terminal 2 is provided adjacent to the front end face 1c of the dielectric substrate 1 substantially along the longitudinal center axis, as in the case of the embodiment of FIG. Second output terminals 3, 4
Are formed so as to be adjacent to the rear end face 1d of the dielectric substrate 1 and extend in parallel to the respective side faces 1e, 1f of the dielectric substrate 1. The plurality of resonant conductors 5a, 5b, 5c; 6a, 6b, 6c provided between the input terminal 2 and the first output terminal 3 and between the input terminal 2 and the second output terminal 4, respectively, are bent. It is arranged. With this configuration, the first and second output terminals 3 and 4 are arranged as distant from each other as possible, and mutual interaction between the output terminals can be avoided.
【００１１】図６には、本発明の別の実施例を示し、図
示実施例はストリップライン型の二帯域フィルタとして
構成されている。すなわち誘電体基板11中に、入力端子
12、第１、第２の二つの出力端子13、14、及び入力端子
12と第１の出力端子13との間に広がる領域及び入力端子
12と第２の出力端子14との間に広がる領域におけるそれ
ぞれ複数のストリップ状共振導体15a、15b、15c；16a、
16b、16cが挿置されている。これらの入出力端子及び各
ストリップ状共振導体は、好ましくは誘電体基板11を上
下二枚の基板で構成し、これらの基板間にサンドイッチ
状に挾しで互いに積層するか、二枚の基板の一方に入出
力端子及び各ストリップ状共振導体を厚膜または薄膜形
成技術により成膜して形成し、その上の他方の基板を重
ねて互いに接合して構成することができる。また、誘電
体基板11の上側面と下側面にはそれぞれ図示したように
接地導体を成す導体層17がそれぞれ形成されている。か
かる構成のフィルタは、外部からの電磁波の影響を受け
にくくすることができる。FIG. 6 shows another embodiment of the present invention. The illustrated embodiment is constructed as a stripline type two-band filter. That is, in the dielectric substrate 11, the input terminal
12, first and second two output terminals 13 and 14, and input terminal
A region extending between 12 and the first output terminal 13 and the input terminal
A plurality of strip-shaped resonant conductors 15a, 15b, 15c; 16a, respectively, in a region extending between 12 and the second output terminal 14.
16b and 16c are inserted. These input / output terminals and each strip-shaped resonance conductor are preferably composed of two upper and lower substrates of the dielectric substrate 11 and sandwiched between these substrates so as to be stacked one on top of the other, or between the two substrates. An input / output terminal and each strip-shaped resonance conductor may be formed on one side by a thick-film or thin-film forming technique, and the other substrate may be overlaid and bonded to each other. Further, as shown in the figure, conductor layers 17 forming ground conductors are formed on the upper and lower side surfaces of the dielectric substrate 11, respectively. The filter having such a configuration can be made less susceptible to electromagnetic waves from the outside.
【００１２】ところで、低周波側フィルタ及び高周波側
フィルタはそれぞれ、三つの共振導体で構成されている
が、共振導体の数は、得ようとするフィルタ特性に応じ
て任意に選択することができる。また、図６に示す実施
例においても、入力端子、第１の出力端子、第２の出力
端子及び複数の共振導体を図５に示すように構成するこ
ともできる。The low-frequency filter and the high-frequency filter are each composed of three resonance conductors, but the number of resonance conductors can be arbitrarily selected according to the filter characteristics to be obtained. Also in the embodiment shown in FIG. 6, the input terminal, the first output terminal, the second output terminal, and the plurality of resonant conductors can be configured as shown in FIG.
【００１３】[0013]
【発明の効果】以上説明してきたように、本発明によれ
ば、誘電体基板に一つの入力端子と二つの出力端子を設
け、入力端子とそれぞれの出力端子との間に複数の共振
導体を設け、これらの二組の共振導体の中心周波数が異
なるように構成しているので、二組の共振導体により低
周波側と高周波側との二つの伝送周波数帯域をもつフィ
ルタを提供することができる。その結果、伝送周波数帯
域毎のフィルタを組み込んだり、スイッチングＩＣや分
岐機能をもつカプラなどを使用することなくり、端末装
置を実質的に大型化したりコストアップせずに二つの通
信システムに適応させることができるようになる。As described above, according to the present invention, one input terminal and two output terminals are provided on the dielectric substrate, and a plurality of resonance conductors are provided between the input terminal and each output terminal. Since these two sets of resonance conductors have different center frequencies, it is possible to provide a filter having two transmission frequency bands, a low frequency side and a high frequency side, by the two sets of resonance conductors. . As a result, it is possible to adapt to two communication systems without incorporating a filter for each transmission frequency band, using a switching IC or a coupler having a branching function, and substantially increasing the size of the terminal device or increasing the cost. Will be able to.
【図１】 本発明の一実施例を示す概略斜視図。FIG. 1 is a schematic perspective view showing an embodiment of the present invention.
【図２】 図１に示す装置の共振導体の配列の説明線
図。FIG. 2 is an explanatory diagram of an array of resonant conductors of the device shown in FIG.
【図３】 図１に示す装置に用いられる入出力端子及び
共振導体構成の一例を示す拡大平面図。3 is an enlarged plan view showing an example of the configuration of an input / output terminal and a resonant conductor used in the device shown in FIG.
【図４】 図１に示す装置のフィルタ特性を示すグラ
フ。FIG. 4 is a graph showing filter characteristics of the device shown in FIG.
【図５】 図１に示す装置の変形例を示す部分拡大平面
図。5 is a partially enlarged plan view showing a modified example of the apparatus shown in FIG.
【図６】 本発明の別の実施例を示す概略斜視図。FIG. 6 is a schematic perspective view showing another embodiment of the present invention.
１：誘電体基板 ２：入力端子 ３：第１の出力端子 ４：第２の出力端子 5a、5b、5c：共振導体 6a、6b、6c：共振導体 ７：導体層 1: Dielectric substrate 2: Input terminal 3: First output terminal 4: Second output terminal 5a, 5b, 5c: Resonant conductors 6a, 6b, 6c: Resonant conductor 7: Conductor layer
Claims (6)
とも一方に接地導体を設け、誘電体基板の相対した端面
の一方に隣接して入力端子を、また他方の端面に隣接し
て第１、第２の二つの出力端子を互いに離間して設け、
入力端子と第１の出力端子との間に広がる領域及び入力
端子と第２の出力端子との間に広がる領域に、それぞれ
複数の共振導体を設け、入力端子と第１の出力端子との
間に設けた複数の共振導体と入力端子と第２の出力端子
との間に設けた複数の共振導体とがそれぞれ異なる中心
周波数をもつように構成したことを特徴とする二帯域フ
ィルタ。1. A ground conductor is provided on at least one of opposite main outer surfaces of a dielectric substrate, an input terminal is adjacent to one of opposite end surfaces of the dielectric substrate, and a first conductor is adjacent to the other end surface. , The second two output terminals are provided apart from each other,
A plurality of resonance conductors are provided in an area extending between the input terminal and the first output terminal and an area extending between the input terminal and the second output terminal, respectively, and between the input terminal and the first output terminal. And a plurality of resonance conductors provided between the input terminal and the second output terminal, each having a different center frequency.
方に上記接地導体が設けられ、他方の主外表面上に上記
入力端子、第１、第２の出力端子及び各共振導体が設け
られている請求項１に記載の二帯域フィルタ。2. The ground conductor is provided on one of the opposing main outer surfaces of the dielectric substrate, and the input terminal, the first and second output terminals, and the resonance conductors are provided on the other main outer surface. The two-band filter according to claim 1, which is provided.
配置され、入力端子と第１の出力端子との間に設けた複
数の共振導体における隣接共振導体の結合部の長さが一
定であり、また入力端子と第２の出力端子との間に設け
た複数の共振導体における隣接共振導体の結合部の長さ
が一定であり、かつ上記入力端子と第１の出力端子との
間の隣接共振導体の上記結合部の長さと異なっている請
求項１に記載の二帯域フィルタ。3. The resonance conductors are spaced apart from each other and arranged in parallel, and the lengths of the coupling portions of the adjacent resonance conductors among the plurality of resonance conductors provided between the input terminal and the first output terminal are constant. The length of the coupling portion of the adjacent resonance conductors in the plurality of resonance conductors provided between the input terminal and the second output terminal is constant, and between the input terminal and the first output terminal. The two-band filter according to claim 1, wherein a length of the coupling portion of the adjacent resonance conductor is different from that of the coupling portion.
の端面に対してほぼ直角にのび、上記第１、第２の出力
端子がそれぞれ上記誘電体基板の他方の端面に隣接して
ほぼ平行に上記誘電体基板のそれぞれの側面に向かって
のび、入力端子と第１の出力端子との間及び入力端子と
第２の出力端子の間にそれぞれ設けた複数の共振導体が
屈曲形状に配置されている請求項１〜３のいずれか一項
に記載の二帯域フィルタ。4. The input terminal extends substantially at right angles to one end surface of the dielectric substrate, and the first and second output terminals are substantially adjacent to the other end surface of the dielectric substrate, respectively. A plurality of resonance conductors extending in parallel to the respective side surfaces of the dielectric substrate and provided between the input terminal and the first output terminal and between the input terminal and the second output terminal are arranged in a bent shape. The two-band filter according to any one of claims 1 to 3.
マイクロストリップ形状を成している請求項１〜４のい
ずれか一項に記載の二帯域フィルタ。5. The two-band filter according to claim 1, wherein each resonance conductor has a strip shape or a microstrip shape.
し、上記誘電体基板内に形成されている請求項１に記載
の二帯域フィルタ。6. The two-band filter according to claim 1, wherein each of the resonance conductors has a strip shape and is formed in the dielectric substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4172696A JPH09232807A (en) | 1996-02-28 | 1996-02-28 | Dual-band filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4172696A JPH09232807A (en) | 1996-02-28 | 1996-02-28 | Dual-band filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09232807A true JPH09232807A (en) | 1997-09-05 |
Family
ID=12616436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4172696A Pending JPH09232807A (en) | 1996-02-28 | 1996-02-28 | Dual-band filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09232807A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7116186B2 (en) | 2004-09-01 | 2006-10-03 | Industrial Technology Research Institute | Dual-band bandpass filter |
| JP2016046587A (en) * | 2014-08-20 | 2016-04-04 | 株式会社東芝 | Switching device, transmitter receiver, and antenna device |
| CN113330634A (en) * | 2019-02-28 | 2021-08-31 | 阿维科斯公司 | High-frequency surface-mountable microstrip band-pass filter |
| WO2021187457A1 (en) | 2020-03-17 | 2021-09-23 | 株式会社 東芝 | Planar filter |
-
1996
- 1996-02-28 JP JP4172696A patent/JPH09232807A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7116186B2 (en) | 2004-09-01 | 2006-10-03 | Industrial Technology Research Institute | Dual-band bandpass filter |
| JP2016046587A (en) * | 2014-08-20 | 2016-04-04 | 株式会社東芝 | Switching device, transmitter receiver, and antenna device |
| CN113330634A (en) * | 2019-02-28 | 2021-08-31 | 阿维科斯公司 | High-frequency surface-mountable microstrip band-pass filter |
| CN113330634B (en) * | 2019-02-28 | 2024-04-05 | 京瓷Avx元器件公司 | High-frequency surface-mountable microstrip bandpass filter |
| WO2021187457A1 (en) | 2020-03-17 | 2021-09-23 | 株式会社 東芝 | Planar filter |
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