Hybrid mode analysis of coplanar transmission lines

Abstract

A frequency dependent hybrid mode analysis of general coplanar transmission lines is presented. A Fourier transform technique is applied and the resulting expressions are evaluated numerically using the method of moments. Shielded slot line resonators as well as dispersion characteristic and characteristic impedance of open and closed boundary slot lines, coupled slot lines and coplanar strip lines are obtained. An extension of this technique is used in a perturbational analysis of slot lines on a ferrite substrate. The theoretical performances of various slot line directional couplers are predicted. Numerical results are compared with experiments in various cases, where excellent agreement has been obtained