,Compact high-order quint-band superconducting band-pass filter

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In this paper,we present a compact quint-band superconducting filter operating at 2.4,3.5,4.7,5.3,and 5.9 GHz.Matching junctions with different impedance branch lines are used to connect a dual-band sub-filter with a tri-band sub-filter and to reduce the channel interactions.The quint-band filter design is divided into two sections to determine the controllable frequencies and bandwidths,while ensuring compact size and reducing design complexity.The filter is fabricated on double-sided YBCO film deposited on an MgO substrate with a size of 26 mm× 19 mm.The measured results match well with the simulations.
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