Superconducting filter
First Claim
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1. A superconducting filter comprising:
- a dielectric substrate;
an input feeder formed on one surface of the dielectric substrate and formed of a superconductor film, for inputting a radio-frequency signal;
a resonator pattern formed on said one surface of the dielectric substrate and formed of a superconductor film, for filtering the radio-frequency signal inputted from the input feeder;
an output feeder formed on said one surface of the dielectric substrate and formed of a superconductor film, for outputting the radio-frequency signal filtered by the resonator pattern; and
a dielectric body mounted on said one surface of the dielectric substrate with a plurality of spacers disposed therebetween,the dielectric body covering a region including the resonator pattern, an end part of the input feeder on a side nearer the resonator pattern, the end part of the input feeder having a length not less than 80% of a positive integer multiple of a ¼
effective wavelength and not more than 120% of the positive integer multiple of the ¼
effective wavelength and an end part of the output feeder on a side nearer the resonator pattern, the end part of the output feeder having a length not less than 80% of the positive integer multiple of the ¼
effective wavelength and not more than 120% of the positive integer multiple of the ¼
effective wavelength,wherein the input feeder and the output feeder are partially covered by the dielectric body.
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Abstract
A superconducting filter including input/output feeders formed on one surface of a dielectric substrate, resonator patterns formed on one surface of the dielectric substrate, and a dielectric plate mounted on the one surface of the dielectric substrate with a plurality of spacers formed on said one surface of the dielectric substrate disposed therebetween. The dielectric plate covers the region including the resonator patterns, and the input/output feeders length-wise over the length within ±20% of positive integer times a ¼ effective wavelength from the sides nearer to the resonator patterns.
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Citations
20 Claims
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1. A superconducting filter comprising:
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a dielectric substrate; an input feeder formed on one surface of the dielectric substrate and formed of a superconductor film, for inputting a radio-frequency signal; a resonator pattern formed on said one surface of the dielectric substrate and formed of a superconductor film, for filtering the radio-frequency signal inputted from the input feeder; an output feeder formed on said one surface of the dielectric substrate and formed of a superconductor film, for outputting the radio-frequency signal filtered by the resonator pattern; and a dielectric body mounted on said one surface of the dielectric substrate with a plurality of spacers disposed therebetween, the dielectric body covering a region including the resonator pattern, an end part of the input feeder on a side nearer the resonator pattern, the end part of the input feeder having a length not less than 80% of a positive integer multiple of a ¼
effective wavelength and not more than 120% of the positive integer multiple of the ¼
effective wavelength and an end part of the output feeder on a side nearer the resonator pattern, the end part of the output feeder having a length not less than 80% of the positive integer multiple of the ¼
effective wavelength and not more than 120% of the positive integer multiple of the ¼
effective wavelength,wherein the input feeder and the output feeder are partially covered by the dielectric body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeFujitsu Limited
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Original AssigneeFujitsu Limited
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InventorsKai, Manabu, Nakanishi, Teru, Akasegawa, Akihiko, Yamanaka, Kazunori
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Primary Examiner(s)Lee; Benny T.
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Assistant Examiner(s)Glenn; Kimberly E
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Application NumberUS10/949,808Publication NumberTime in Patent Office960 DaysField of Search333/99.S, 333/202, 333/204, 505/210, 505/700, 505/866US Class Current333/99.00SCPC Class CodesH01P 1/20336 Comb or interdigital filtersH01P 1/20363 Linear resonatorsH01P 1/20381 Special shape resonatorsY10S 505/70 High TC, above 30 k, superc...Y10S 505/866 Wave transmission line, net...
