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A full-wave spectral-domain volume-integralequation technique is used to calculate the complex propagation constant, the complex characteristic impedance, and the current distribution for Nb and YBazCuSOT-, microstrip lines and coplanar waveguides with superconducting ground planes. Measurements of resonant frequency and quality factor are performed on Nb microstrip and coplanar waveguide resonators, and the results are compared with numerical calculations. The power-handling capability of various superconducting transmission-line structures is calculated and discussed. Results of phase noise measurements on Nb microstrip resonators suggest that phase-noise may be related to the current distribution in the structure.

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A computationally efficient full-wave technique is developed to analyze superconducting microstrip lines on M-plane sapphire in which the optic axis is in the plane of the substrate at an arbitrary angle with respect to the propagation direction. To increase the efficiency of the method, the superconducting strip is replaced by an equivalent surface impedance which accounts for the loss and kinetic inductance of the superconductor. Complex propagation constant and characteristic impedance are calculated and compared to both measured results and results obtained by the more rigorous volume-integral-equation method.