Design and performance of miniaturized superconducting coplanar waveguide filters

Design and performance of coplanar waveguide (CPW) microwave filters using high Tc superconducting films have been studied. The bandpass filter made of CPW requires the coating of only one side of the substrate with a superconductor, and the width of the CPW filter can be uniformly reduced in scale without changing its characteristic impedance, leading to a miniaturized filter by adopting the meanderline geometry. In order to realize the miniaturized filter we investigate the interdigital gap with strong coupling and the modeling of the corner bend. It is shown that the size of the filter can be greatly reduced by introducing CPW with a meanderline geometry. Experiments of a prototype miniaturized CPW filter with its computer-simulated performance have been presented.