Abstract
We report the characteristics of a high-Tc superconducting (HTS) 4-pole bandpass filter (BPF) with center frequency of 3.9 GHz. YBa2Cu3O7−x films were grown on MgO substrate (20×20×5 mm3) by using a hollow cathode sputtering method. To improve the stopband characteristics and to reduce the physical size of a device pattern, we designed a new type microwave bandpass filter consisting of closed-loop resonators and parallel coupled-lines. In resonator structure and in connections between input/output ports and resonators, the stepped impedance lines and the microstrip coupled-lines are used, respectively. The measured microwave responses of HTS 4-pole bandpass filters were in a good agreement with the simulation result except a small shift of center frequency.
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