JPH07147501A - Superconducting termination coupling filter - Google Patents
Superconducting termination coupling filterInfo
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- JPH07147501A JPH07147501A JP29288793A JP29288793A JPH07147501A JP H07147501 A JPH07147501 A JP H07147501A JP 29288793 A JP29288793 A JP 29288793A JP 29288793 A JP29288793 A JP 29288793A JP H07147501 A JPH07147501 A JP H07147501A
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- superconducting
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- resonator
- filter
- feed line
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、超伝導端結合フィルタ
に関する。FIELD OF THE INVENTION The present invention relates to a superconducting end coupled filter.
【０００２】[0002]
【従来の技術】近年、情報の高度化、汎用化、多様化に
伴い、光通信回線、衛星通信回線を基幹回線とし、自動
車、航空機、船舶或いは人などの移動体に通信端末を装
備したパーソナル通信が大幅に普及しつつある。この
為、高周波領域の通信帯域が不足し、通信帯域の高周波
化、チャンネル数の増加が図られつつある。2. Description of the Related Art In recent years, with the sophistication, generalization and diversification of information, optical communication lines and satellite communication lines have been used as backbone lines, and personal computers equipped with communication terminals for vehicles such as automobiles, aircraft, ships and people. Communications are becoming very popular. Therefore, the communication band in the high frequency region is insufficient, and the communication band is becoming higher in frequency and the number of channels is increasing.
【０００３】通常、パーソナル通信に係わらず、無線通
信ネットワークには、中央局、基地局、中継局等の階層
構成が取られているが、これらの送受信系装置には、多
くのフィルタが使用されている。現在、マイクロ波・ミ
リ波帯のフィルタとして、誘電体フィルタ、導波管フィ
ルタが用いられているが、今後の通信チャンネル需要に
伴い、より一層狭帯域で小型、低損失なフィルタが切望
されている。このようなフィルタの候補として、超伝導
フィルタが有望である。Generally, regardless of personal communication, the wireless communication network has a hierarchical structure of a central station, a base station, a relay station, etc., but many filters are used for these transmitting and receiving devices. ing. At present, dielectric filters and waveguide filters are used as microwave / millimeter-wave band filters, but with the demand for communication channels in the future, there is a strong demand for smaller, more compact, low-loss filters. There is. A superconducting filter is a promising candidate for such a filter.
【０００４】従来の金属系超伝導フィルタでは、動作温
度が１０Ｋ程度であったため、通常の通信装置へ適用す
ることは事実上不可能であったが、臨界温度が液体窒素
温度（７７Ｋ）を越える酸化物超伝導体の出現により、
超伝導フィルタの適用される可能性が高くなり、実際、
米国では衛星回線の中継極用として検討されている。In the conventional metal-based superconducting filter, the operating temperature was about 10K, so it was practically impossible to apply it to ordinary communication equipment, but the critical temperature exceeded the liquid nitrogen temperature (77K). With the advent of oxide superconductors,
The possibility that superconducting filters will be applied increases, in fact,
In the United States, it is being considered as a relay pole for satellite circuits.
【０００５】図５（ａ）（ｂ）に高周波フィルタの概略
を示す。図中、１は給電線路、２は半波長共振器、３は
共振器間或いは給電線路と共振器間の電気的な結合領域
である。フィルタの結合方式には、図５（ａ）に示すよ
うに、側面が部分的に並列的となるように半波長共振器
２を階段状に配置した側結合方式と、図５（ｂ）に示す
ように、半波長共振器２を一直線状に配列した端結合方
式との二つの結合方式がある。FIGS. 5A and 5B schematically show a high frequency filter. In the figure, 1 is a feed line, 2 is a half-wave resonator, and 3 is an electrical coupling region between the resonators or between the feed line and the resonator. As shown in FIG. 5 (a), the filter coupling method includes a side coupling method in which half-wavelength resonators 2 are arranged in a staircase so that side surfaces thereof are partially parallel, and a side coupling method is shown in FIG. 5 (b). As shown, there are two coupling methods, an end coupling method in which the half-wave resonators 2 are arranged in a straight line.
【０００６】一般の高周波フィルタでは、設計法が確立
されていること、共振器Ｑ値が高くとれることから、側
結合方式が超伝導、常伝導フィルタの如何に関わらず多
く用いられている。一方、端結合方式は、フィルタの全
体寸法を小さくすることができることから、線形共振器
を基本とした狭帯域で小型の超伝導フィルタに適してい
る。In a general high-frequency filter, the side-coupling method is often used regardless of whether it is a superconducting filter or a normal-conducting filter because a design method is established and a resonator Q value can be set high. On the other hand, the end-coupling method can reduce the overall size of the filter, and is therefore suitable for a narrow band and small-sized superconducting filter based on a linear resonator.
【０００７】これら超伝導フィルタの問題点の一つとし
て、扱えるパワーに制限があるという点があった。例え
ば、衛星搭載用中継器には、送信系、受信系にお得な超
伝導帯域通過フィルタがそれぞれ、分波用、合波用とし
て搭載されているが、入力用フィルタとしては数ｍＷ、
出力用フィルタとしては数十ｍＷのパワーを扱う必要が
ある。ここで、酸化物超伝導フィルタの扱えるパワー
は、現状では高々、数ｍＷであるため、今のところは受
信系にした適用できない。One of the problems with these superconducting filters is that the power that can be handled is limited. For example, a satellite-mounted repeater is equipped with superconducting bandpass filters suitable for a transmission system and a reception system for demultiplexing and multiplexing, respectively, but for an input filter several mW,
The output filter must handle power of several tens of mW. Here, since the power that can be handled by the oxide superconducting filter is at most several mW at present, it cannot be applied to the receiving system at present.
【０００８】超伝導線形共振器に比較的高いパワーが入
力された場合、長方形状の線形共振器の中央の両サイド
部分に電流が集中し、それにより超伝導共振器の超伝導
特性、特に、表面抵抗が劣化するため、入力パワーが限
られてしまうためである。図６（ａ）に、長方形状の線
形共振器４を基本とする３極線形フィルタの概略を、同
図（ｂ）に円盤共振器５を基本とする３極円盤（ディス
ク）フィルタの概略をそれぞれ示す。When a relatively high power is input to the superconducting linear resonator, current concentrates on both sides of the center of the rectangular linear resonator, whereby the superconducting characteristics of the superconducting resonator, in particular, This is because the input power is limited because the surface resistance deteriorates. FIG. 6A shows an outline of a three-pole linear filter based on the rectangular linear resonator 4, and FIG. 6B shows an outline of a three-pole disc (disk) filter based on the disc resonator 5. Shown respectively.
【０００９】最近、この円盤フィルタで入力パワー制限
が大幅に改善されることが報告され、これは主に、円盤
共振器の電流が円盤形状に沿って分布したため、線形共
振器で生じる電流集中が軽減されたためと解釈されてい
る（例えば、超伝導国際シンポジウム，ＩＳＳ’９３、
広島、ＤＡＰ−３）。Recently, it has been reported that this disc filter significantly improves the input power limitation, which is mainly due to the fact that the current in the disc resonator is distributed along the disc shape, so that the current concentration generated in the linear resonator is reduced. Interpreted as due to mitigation (eg International Superconductivity Symposium, ISS'93,
Hiroshima, DAP-3).
【００１０】図７に、３極円盤フィルタにおける挿入損
失のパワー依存性を示す。図７に示すように、少なくと
も１８０Ｗまでは、挿入損失、周波数応答ともに変化は
見られない。従って、円盤共振器を用いた超伝導フィル
タは、送信系のフィルタとしても適用できることは明ら
かである。FIG. 7 shows the power dependence of insertion loss in a three-pole disc filter. As shown in FIG. 7, neither the insertion loss nor the frequency response changes at least up to 180 W. Therefore, it is clear that the superconducting filter using the disc resonator can be applied as a filter of the transmission system.
【００１１】[0011]
【発明が解決しようとする課題】図８に、３極円盤共振
器フィルタのフィルタ波形を示すように、中心周波数
７．５１ＧＨｚ、比帯域幅約１％、挿入損失０．７ｄＢ
と狭帯域で低損失なフィルタ特性を示すが、通過帯域の
リップルが約７ｄＢと比較的大きくなっている。これ
は、超伝導円盤共振器のＱ値が高いにも関わらず、給電
線路と近接した円盤共振器との結合が弱いためである。
しかしながら、従来の端結合構造では、給電線路と円盤
共振器との結合を大幅に強くすることはできず、この点
は、円盤フィルタに限らず、線形フィルタでも全く同様
である。As shown in the filter waveform of the three-pole disc resonator filter in FIG. 8, the center frequency is 7.51 GHz, the specific bandwidth is about 1%, and the insertion loss is 0.7 dB.
Shows a low-loss filter characteristic in a narrow band, but the ripple in the pass band is relatively large at about 7 dB. This is because, although the Q value of the superconducting disk resonator is high, the coupling between the feed line and the disk resonator adjacent thereto is weak.
However, in the conventional end-coupling structure, the coupling between the feed line and the disk resonator cannot be significantly strengthened, and this point is not limited to the disk filter and is exactly the same with the linear filter.
【００１２】このように端結合方式の超伝導フィルタ
は、線形共振器を基本とした超伝導フィルタのように全
体寸法を小さくする上で有利であり、また同時に、円盤
共振器を基本とした超伝導フィルタのように扱えるパワ
ーが大幅に改善されるという観点から有望であるが、そ
れらの超伝導共振器のＱ値が高い割に、給電線路との結
合が弱いという問題があった。それゆえ、高Ｑの共振器
と給電線路間の結合を強くでき、それらの結合を制御で
きる構造が強く望まれていた。As described above, the end-coupling type superconducting filter is advantageous in reducing the overall size like a superconducting filter based on a linear resonator, and at the same time, a superconducting filter based on a disk resonator. It is promising from the viewpoint that the power that can be handled like a conduction filter is significantly improved, but there is a problem that the coupling with the feed line is weak despite the high Q value of these superconducting resonators. Therefore, a structure capable of strengthening the coupling between the high Q resonator and the feed line and controlling the coupling has been strongly desired.
【００１３】本発明は、上記従来技術に鑑みてなされた
ものであり、端結合方式の超伝導フィルタにおける、給
電線路とそれらに最も近接した高Ｑ超伝導共振器間の結
合を、指状に差し込んだ構造とすることによって強く
し、通過帯域でのリップルが小さく、狭帯域で低損失
な、小型或いは高入力パワー対応の超伝導端結合フィル
タを提供することを目的とする。The present invention has been made in view of the above-mentioned prior art, and in an end-coupling type superconducting filter, the coupling between the feed line and the high Q superconducting resonator closest to them is finger-shaped. It is an object of the present invention to provide a superconducting end-coupling filter which is small in size and has high input power and which is made stronger by making a plug-in structure, has a small ripple in a pass band, has a low loss in a narrow band.
【００１４】[0014]
【課題を解決するための手段】斯かる目的を達成する本
発明の構成は端結合方式の超伝導フィルタにおける、給
電線路と、それらに最も近接した高Ｑな超伝導共振器と
の間の結合を、指状に差し込んだ構造とすることによっ
て強くすることを特徴とする。The structure of the present invention for achieving the above object is a coupling between a feed line and a high-Q superconducting resonator closest to them in an end-coupling type superconducting filter. Is strengthened by having a structure that is inserted like a finger.
【００１５】[0015]
【実施例】以下、本発明について、図面に示す実施例を
参照して詳細に説明する。 〔実施例１〕図１に本発明の第一の実施例を示す。本実
施例は、超伝導円盤共振器を基本としたフィルタ構成例
である。図中において、１は給電線路、５は超伝導円盤
共振器、６は結合部である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. [Embodiment 1] FIG. 1 shows a first embodiment of the present invention. The present embodiment is an example of a filter configuration based on a superconducting disk resonator. In the figure, 1 is a feed line, 5 is a superconducting disk resonator, and 6 is a coupling part.
【００１６】給電線路１としては、超伝導或いは常伝導
金属薄膜から構成される。本実施例では、給電線路１の
幅は０．１６ｍｍ（５０オーム線路）である。超伝導円
盤共振器５は複数個設けられ、本実施例の場合は３個設
けられている。これらの超伝導円盤共振器５は、一直線
状に配列した、いわゆる端結合方式が採用される。超伝
導円盤共振器５は直径７ｍｍである。The feed line 1 is composed of a superconducting or normal conducting thin metal film. In this embodiment, the width of the feed line 1 is 0.16 mm (50 ohm line). A plurality of superconducting disk resonators 5 are provided, and in the case of this embodiment, three are provided. These superconducting disk resonators 5 employ a so-called end-coupling method in which they are arranged in a straight line. The superconducting disk resonator 5 has a diameter of 7 mm.
【００１７】給電線路１、超伝導円盤共振器５の形成さ
れる基板としては、例えば、酸化マグネシウム結晶の
（１００）面が用いられる。基板の厚さは０．５ｍｍで
ある。給電線路１、超伝導円盤共振器５としては、本実
施例では、臨界温度９０ＫのＥuＢaＣuＯ酸化物超伝導
薄膜で形成し、上下にグランドプレーン８、グランドプ
レーン９を配置したストリップライン構造となってい
る。As the substrate on which the feed line 1 and the superconducting disk resonator 5 are formed, for example, a (100) plane of magnesium oxide crystal is used. The thickness of the substrate is 0.5 mm. In the present embodiment, the feed line 1 and the superconducting disk resonator 5 are formed of a EuBaCuO oxide superconducting thin film having a critical temperature of 90K, and have a stripline structure in which a ground plane 8 and a ground plane 9 are arranged above and below. There is.
【００１８】更に、本実施例では、給電線路１とこれと
最も近接した超伝導円盤共振器５とを強く結合するた
め、その間に結合部６を設けている。この結合部６は、
給電線路１に最も近接した超伝導円盤共振器５の一部を
長方形状に除去し、その除去部に給電線路１の一部を差
し込んだ構造である。Further, in this embodiment, a coupling portion 6 is provided between the feed line 1 and the superconducting disk resonator 5 closest to the feed line 1 in order to strongly couple them. This connecting portion 6 is
This is a structure in which a part of the superconducting disk resonator 5 closest to the feed line 1 is removed in a rectangular shape and a part of the feed line 1 is inserted into the removed portion.
【００１９】この結合部６は、先ず、給電線路１に最も
近接した超伝導円盤共振器５の円盤の一部を、給電線路
１の軸線上に長さ４００ミクロン、幅４６０ミクロンの
長方形状に除去し、次に、それらの縁から１００ミクロ
ンの隙間を維持するように、長さ３００ミクロン、幅１
６０ミクロンの給電線路１を、除去した部分に差し込む
ことにより作成する。In this coupling portion 6, first, a part of the disk of the superconducting disk resonator 5 closest to the feeding line 1 is formed in a rectangular shape having a length of 400 μm and a width of 460 μm on the axis of the feeding line 1. Removed, then 300 microns long, 1 width wide to maintain a 100 micron gap from their edges.
It is created by inserting the 60-micron feed line 1 into the removed portion.
【００２０】上記実施例の端結合構造を用いた３極フィ
ルタの周波数応答を図３に示す。図３に示すように、本
実施例の端結合構造は、図８に示す従来構造の特性に比
較して、通過帯域のリップルが大幅に改善されているこ
とが判る。これは結合部６により、給電線路１と近接し
た超伝導円盤共振器５との端結合が、従来の端結合に比
較して、強くなったためである。尚、比帯域幅の僅かな
増大が観察されたものの、挿入損失、中心周波数及びパ
ワー依存度には殆ど変化は見られなかった。FIG. 3 shows the frequency response of the three-pole filter using the end coupling structure of the above embodiment. As shown in FIG. 3, it can be seen that the end-coupling structure of the present embodiment has the ripple in the pass band significantly improved as compared with the characteristics of the conventional structure shown in FIG. This is because the coupling portion 6 strengthens the end coupling between the feed line 1 and the superconducting disk resonator 5 in the vicinity thereof, as compared with the conventional end coupling. Although a slight increase in the specific bandwidth was observed, almost no change was observed in the insertion loss, center frequency and power dependence.
【００２１】〔実施例２〕本発明の第二の実施例を図２
に示す。本実施例は、超伝導線形共振器を基本としたフ
ィルタ構成例である。図中において、１は給電線路、４
は超伝導線形共振器、６は結合部である。結合部６は、
実施例１と同様に、給電線路１の一部を最も近接した超
伝導線形共振器４の内部へ指状に差し込んだ構造であ
る。[Embodiment 2] A second embodiment of the present invention is shown in FIG.
Shown in. The present embodiment is a filter configuration example based on a superconducting linear resonator. In the figure, 1 is a feeder line, 4
Is a superconducting linear resonator, and 6 is a coupling part. The connecting portion 6 is
Similar to the first embodiment, a part of the feed line 1 is finger-shaped inserted into the closest superconducting linear resonator 4.
【００２２】本実施例は、実施例１における超伝導円盤
共振器５に代えて超伝導線形共振器４を用いた点を除
き、その他の構成は実施例１と同様である。従って、本
実施例においても、給電線路１と近接した超伝導線形共
振器４との端結合が強化され、これにより図３に示すよ
うに通過帯域のリップルが大幅に改善されるなどフィル
タ特性の改善が見られた。更に、本実施例は、超伝導円
盤共振器５を用いているために、扱えるパワーが比較的
大きいという利点をも有する。This embodiment is the same as the first embodiment except that the superconducting linear resonator 4 is used instead of the superconducting disk resonator 5 in the first embodiment. Therefore, also in the present embodiment, the end coupling between the feed line 1 and the superconducting linear resonator 4 adjacent to the feed line 1 is strengthened, and as a result, ripples in the pass band are significantly improved as shown in FIG. Improvement was seen. Further, this embodiment has an advantage that the power that can be handled is relatively large because the superconducting disk resonator 5 is used.
【００２３】〔実施例３〕本発明の第三の実施例を図４
に示す。本実施例は、給電線路１と超伝導線形共振器４
との端結合を更に強化するように改良したものである。
即ち、給電線路１の一部と、これに近接する超伝導線形
共振器４とを、指状に相互に入り込ませる構造の結合部
７としたものである。つまり、給電線路１の一端を凹凸
形状に除去すると共にこれに最も近接した超伝導線形共
振器４の一部を凹凸形状に除去し、それらの凹凸形状が
相互に差し込むように、給電線路１と超伝導線形共振器
４とを配置したものである。このような構造の結合部７
は、図１、図２に示すものよりも、より一層強い結合を
実現でき、そのキャパシタンスの制御範囲を広くするこ
とができた。[Embodiment 3] A third embodiment of the present invention is shown in FIG.
Shown in. In this embodiment, the feed line 1 and the superconducting linear resonator 4 are used.
It is an improvement to further strengthen the end coupling with.
That is, a part of the feed line 1 and the superconducting linear resonator 4 close to the feed line 1 are combined into a finger-like coupling portion 7. That is, one end of the power feeding line 1 is removed in an uneven shape, and a part of the superconducting linear resonator 4 closest to the power feeding line 1 is removed in an uneven shape, so that the uneven shapes are inserted into each other. The superconducting linear resonator 4 is arranged. The connecting portion 7 having such a structure
1 was able to realize stronger coupling than that shown in FIGS. 1 and 2 and to widen the control range of its capacitance.
【００２４】このように、本発明の端結合構造を端結合
方式の超伝導フィルタに採用することにより、通過帯域
のリップルを大幅に低減できるとともに、フィルタ設計
の自由度が増すことができる。従って、線形フィルタで
はより小型の、狭帯域で低損失な超伝導フィルタが、円
盤フィルタではより高い入力パワーを扱える、狭帯域で
低損失な超伝導フィルタが実現できる。As described above, by adopting the end-coupling structure of the present invention in the end-coupling type superconducting filter, ripples in the pass band can be greatly reduced and the degree of freedom in filter design can be increased. Therefore, it is possible to realize a smaller superconducting filter with a narrow band and low loss in a linear filter, and a narrow band, low loss superconducting filter with a higher input power in a disc filter.
【００２５】[0025]
【発明の効果】以上、実施例に基づいて具体的に説明し
たように、本発明では、給電線路とこれに近接した共振
器との結合を強くし、設計の自由度を広げることができ
るため、通過帯域のリップルが小さく狭帯域で低損失
な、小型或いは高入力パワー対応の超伝導端結合フィル
タを提供でき、これらを通信用送受信器へ適用すること
により、より高品質で経済的なパーソナル通信を実現で
き、しかも、周波数帯域を有効に利用できるという利点
がある。As described above in detail based on the embodiments, in the present invention, the coupling between the feed line and the resonator adjacent thereto can be strengthened and the degree of freedom in design can be expanded. , It is possible to provide a small or high input power compatible superconducting end coupling filter with a small ripple in the pass band and low loss in a narrow band, and by applying these to a transceiver for communication, a higher quality and economical personal There is an advantage that communication can be realized and the frequency band can be effectively used.
【図１】本発明の第一の実施例に係り、超伝導円盤共振
器を基本とする超伝導端結合フィルタの構成図である。FIG. 1 is a configuration diagram of a superconducting end-coupling filter based on a superconducting disk resonator according to a first embodiment of the present invention.
【図２】本発明の第二の実施例に係り、超伝導線形共振
器を基本とする超伝導端結合フィルタの構成図である。FIG. 2 is a configuration diagram of a superconducting end coupling filter based on a superconducting linear resonator according to the second embodiment of the present invention.
【図３】本発明の結合構造を用いた３極フィルタの周波
数特性を示すグラフである。FIG. 3 is a graph showing frequency characteristics of a three-pole filter using the coupling structure of the present invention.
【図４】本発明の第三の実施例に係り、超伝導線形共振
器を基本とする超伝導端結合フィルタの構成図である。FIG. 4 is a configuration diagram of a superconducting end coupling filter based on a superconducting linear resonator according to the third embodiment of the present invention.
【図５】高周波フィルタの概略を示す構成図である。FIG. 5 is a configuration diagram showing an outline of a high frequency filter.
【図６】３極線形フィルタ、３極円盤フィルタの概略を
示す構成図である。FIG. 6 is a schematic diagram showing a three-pole linear filter and a three-pole disc filter.
【図７】３極円盤フィルタにおける挿入損失のパワー依
存性を示すグラフである。FIG. 7 is a graph showing the power dependence of insertion loss in a three-pole disc filter.
【図８】３極円盤共振器フィルタのフィルタ波形を示す
グラフである。FIG. 8 is a graph showing a filter waveform of a three-pole disc resonator filter.
１ 給電線路 ２ 半波長共振器 ３ 結合領域 ４ 超伝導線形共振器 ５ 超伝導円盤共振器 ６ 指状に差し込んだ構造の結合部 ７ 相互に指状に差し込んだ構造の結合部 ８ 上部グランドプレーン ９ 下部グランドプレーン 1 Feed line 2 Half-wave resonator 3 Coupling region 4 Superconducting linear resonator 5 Superconducting disk resonator 6 Coupling part with finger-like structure 7 Coupling part with finger-like structure 8 Upper ground plane 9 Lower ground plane
Claims (1)
常伝導金属薄膜からなる給電線路とから構成される超伝
導端結合フィルタにおいて、前記給電線路の一部を最も
近接した前記超伝導共振器の内部に、指状に差し込んだ
構成とすることを特徴とする超伝導端結合フィルタ。1. A superconducting end-coupling filter comprising a plurality of superconducting resonators and a feed line made of a superconducting or normal-conducting metal thin film, wherein the part of the feed line is closest to the superconducting one. A superconducting end-coupling filter characterized by being inserted like a finger inside a resonator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29288793A JPH07147501A (en) | 1993-11-24 | 1993-11-24 | Superconducting termination coupling filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29288793A JPH07147501A (en) | 1993-11-24 | 1993-11-24 | Superconducting termination coupling filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07147501A true JPH07147501A (en) | 1995-06-06 |
Family
ID=17787670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29288793A Pending JPH07147501A (en) | 1993-11-24 | 1993-11-24 | Superconducting termination coupling filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07147501A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035088A (en) * | 2006-07-27 | 2008-02-14 | Fujitsu Ltd | Division type microstrip line resonator and filter using the same |
| EP1976053A1 (en) | 2007-03-27 | 2008-10-01 | Fujitsu Ltd. | Superconducting filter device |
-
1993
- 1993-11-24 JP JP29288793A patent/JPH07147501A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035088A (en) * | 2006-07-27 | 2008-02-14 | Fujitsu Ltd | Division type microstrip line resonator and filter using the same |
| EP1976053A1 (en) | 2007-03-27 | 2008-10-01 | Fujitsu Ltd. | Superconducting filter device |
| JP2008244816A (en) * | 2007-03-27 | 2008-10-09 | Fujitsu Ltd | Superconductive filter device |
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