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We have developed a 7 GHz band superconducting 8-pole quasi-elliptic function filter on sapphire substrate. To realize a high Qu microstrip line resonator at 7 GHz band, the structure was used for a resonator so as to suppress the radiation, which consists of two adjacent radiation points with opposite phase. Also, the radiation decreased in proportion to odd times of half-wavelength. Hairpin microstrip...
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