THE INTRODUCTION OF SURFACE-RESISTANCE IN THE 3-DIMENSIONAL FINITE-DIFFERENCE METHOD IN FREQUENCY-DOMAIN

A full-wave treatment or lossy three-dimensional structures using the finite-difference method in frequency domain is presented. This accoun ts for both, dielectric and conductor losses. By introduction of a sur face resistance the effect of conductor losses and surface roughness c an be modeled very efficiently. The modifications of the finite-differ ence frequency domain (FDFD) algorithm are presented. Comparisons betw een the conventional approach using elementary cells with finite condu ctivity and this new discretization method with surface current cells are given, and the advantages and limitations of the surface current m odel are shown.