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We developed ultra-wideband high-temperature superconducting bandpass filters for Japan's low-band spectrum. First, we designed a low-band filter with a microstrip three-mode resonator loaded with two open stubs. The three-mode resonator is characterized by the ease of controlling the frequency response compared with other resonators. In addition, we loaded a low-pass filter consisting of a microstrip...
A novel microstrip stubs-loaded three-mode resonator is proposed, and a wideband bandpass filter having a midband frequency of 4.1GHz and a fractional bandwidth of 34.2% is designed to meet Japan's UWB low-band spectrum mask. The stubs-loaded three-mode resonator is simultaneously used with half-wavelength resonators and a coupled-line hairpin resonator. As a consequence, the desired wide passband...
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