Inhomogeneous dielectric transmission line geometries analysed by combining conformal mapping-finite difference procedures

Various TEM transmission line structures have been proposed in the literature, and their electrical parameters have been computed in many cases with reference to simplified models. These models have been already validated for more conventional structures, and were expected to lead again to good results. Some comparison with accurate general purpose computation procedures are presented, using numerical inversion of the Schwarz-Christoffel formula, and successive over-relaxation procedures on transformed geometries in case of an inhomogeneous dielectric.