ANALYSIS OF PLANAR SUPERCONDUCTING WAVE-GUIDES IN DC MAGNETIC-FIELD

A theoretical analysis of microwave properties of planar superconducti ng waveguides of finite thickness in the presence of an external dc ma gnetic field is presented in this article. Some analytical formulas ar e derived for determining the attenuation and dispersion properties of the superconducting waveguide, which may account for the effects of t he de magnetic field, the electrodynamic properties of type-II superco nductors, the thickness of superconducting films, and the dielectric l oss in the waveguide. Numerical results are then given to show quantit atively how the de magnetic field influences the propagation propertie s of the planar superconducting waveguide. Some analysis are also give n to study the effect of dc magnetic field on the quality factor Q and the resonant frequency of planar superconducting waveguide resonators .