MODELING OF ANISOTROPIC SUPERCONDUCTING WAVE-GUIDE AS EQUIVALENT TRANSMISSION-LINE

This article presents a method of linking full-wave field analysis to distributed-circuit analysis by-modelling anisotropic superconducting waveguides, consisting of two or more parallel superconductors, as equ ivalent transmission lines. As an application of this method, a full-w ave solution is first found for an anisotropic superconducting planar waveguide by solving Maxwell's equations and London's equations modifi ed to account for the effect of both anisotropy and normal electron co nduction in anisotropic superconductors. Based on the full-wave soluti on, a complete set of equivalent transmission line parameters' is then derived analytically to model the anisotropic superconducting planar waveguide. Numerical results are given to show quantitatively how the effect of anisotropy influences the transmission properties of the ani sotropic superconducting planar waveguide at high frequencies. The res ults are compared with those for an isotropic superconducting planar w aveguide as well as with some well-known results from a quasi-static a pproximation. It is shown that the full set of equivalent transmission line parameters based on the full-wave analysis is desired to model p roperly some strongly anisotropic superconducting waveguides at millim eter-wave frequencies. Copyright (C) 1996 Elsevier Science Ltd