Modeling of realistic rectangular /spl mu/-coaxial lines

A comprehensive study of small inhomogeneous multi-layered rectangular coaxial lines (RCLs) with irregular cross sections is presented in this paper. An accurate and efficient quasi-analytical technique based on numerical implementation of simply and doubly connected Schwarz-Christoffel conformal mapping is utilized for modeling. Misaligned and offset layers, under-over cutting due to etching, nonuniform dielectric support, and other nonidealities due to fabrication of RCLs are studied and their effects on characteristic impedance, attenuation, bandwidth, and power-handling capacity are discussed. The validity of obtained results is verified with suitable published data, analytical models, and/or finite-element simulations.