Analysis of the Superconducting Coplanar Waveguide

This paper presents a conductor loss calculation of the high Tc superconducting coplanar waveguide (CPW) by using Phenomenological Equivalence Method (PEM) and two fluid model. In this method, the equivalent strip line is obtained by calculating the equivalent width and thickness of CPW by considering the field penetration into the center conductor and ground plane of the CPW. Then, the conductor loss of CPW is calculated from the equivalent strip line. The theoretically calculted Q values are compared with the experimental results available. It is observed that the effect of the substrate loss becomes critical in superconducting coplanar waveguide because of the reduced conductor loss.