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This paper presents a high-temperature superconducting filter at 7.42GHz with an improved upper-stopband performance. U-type stepped-impedance resonators are used to relocate the spurious frequency and realize wide stopband response. The compact resonators also reduce the filter size and push away the housing box resonant frequencies. Open stubs are introduced at the midpoints of the resonators to...
This paper presents the design, fabrication, and performance of a compact high temperature superconducting duplexer at VHF-band. The duplexer consists of a T-junction and two four-pole filters with an ultra-narrow bandwidth of 400kHz at 216MHz and 220MHz, respectively. By using gap-coupled feedlines in the filter design procedure, the duplexer is constructed by connecting the two filters using a T-junction...
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