Comparison between high-T/sub c/ superconducting microstrip filters and normal conducting counterparts

In this paper the comparative study of HTS microstrip filter and gold counterpart is reported in terms of insertion loss, transmission characteristics, bandwidth and other various characteristics. Practically full procedures from the preparation of each thin films to fabrication procedure of each devices and experimental results are given for both HTS microstrip filter and gold counterpart. The filters used in this work, were based on the use of non-uniform microstrip line type, which is a stepped impedance resonator as a filter element. The superconducting microstrip filter used in this work was fabricated on MgO substrates using YBCO (YBa/sub 2/Cu/sub 3/O/sub 7-x/) superconducting thin films by pulsed laser deposition technique and also, the gold filter with the same dimensions was fabricated on the same substrate by thermal evaporation technique. Then gold thin films of the same thickness were evaporated on the other sides of each filter for the ground plane. Comparison results between HTS filter and gold filter show that a usable filter can be made by using this architecture.