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A novel hairpin ring resonator (HRR) is proposed in this paper. The HRR can generates two controllable resonant modes and its mechanism is analyzed. Then, a fourth-order dual-band high-temperature superconducting (HTS) bandpass filter (BPF) is designed by cascading four HRRs. The HTS filter operating at 1.9 GHz and 2.6 GHz is fabricated on the MgO substrate with double-side coated YBCO thin films...
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