Analysis of radiating axisymmetric structures using a 2-d finite-element and spherical mode expansion

A rigorous method for analyzing axisymmetric radiating structures, using 2-D finite-element techniques and an expansion in spherical harmonics, is presented. The structure, represented by an equivalent multipole, is entirely characterized by its scattering matrix at the interfaces. The radiation patterns and input impedances obtained far several antennas are presented. (C) 1999 John Wiley & Sons, Inc.