HTS microstrip filters using H-type resonators

We report the characteristics of a high-T-c superconductor (HTS) bandpass f ilter with the designed center frequency of 16.5 GHz, A YBa2Cu3O7-x(YBCO) s uperconducting thin film was prepared using the rf-magnetron sputtering dep osition technique. The filter used in this work was composed of the "H"-typ e resonator (non-uniform microstrip lines). This approach has advantages fo r a considerably high Q-value and the compact filter structure, The impedan ce ratio of the "H"type resonator was 0.5 in this work, In the measured res ponses, this I-ITS filter showed the insertion loss of - 0.4 dB at maximum. The measured center frequency of our HTS bandpass filter was 16.44 GHz and the passband was from 15.91 GHz to 16.97 GHz, a bandwidth of 6.86 % with 3 dB in band Chebyshev ripple, Experimental results of our filters were repo rted in terms of insertion loss, return loss and other various characterist ics.