Compact superconducting single-and dual-band filter design using multimode stepped-impedance resonator |
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| Affiliation: | 1. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;2. The No. 14 research institute, China Electronic Technology Corporation(CETC), Nanjing 210013, China |
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| Abstract: | This study presents two multimode stepped-impedance structures to design single-and dual-band filters. Transmission zeroes are introduced for the single-band filter by using dual-mode stepped-impedance resonators. The single-band filter with high selectivity is centered at 6.02 GHz and has a fractional bandwidth(FBW) of 25.6%. Four stubs(two low frequency and two high frequency ones) are connected to the rectangular patch in the center to construct a quadruplemode resonator. The independent conditions of the center frequencies of the high and low bands of the resonator are analyzed. A dual-band filter, which operates at 1.53 GHz and 2.44 GHz with FWBs of 12.1% and 14.1%, respectively is designed. The single-and dual-band filters are both fabricated with double-sided YBCO films and they can be used in mobile and satellite communications. |
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| Keywords: | high-temperature superconducting bandpass filter multimode stepped-impedance resonator dual-band filter |
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