EFFICIENT CGM APPLICATION FOR SCATTERING AND RADIATION OF ANTENNAS ON BOARD ARBITRARY STRUCTURES

Abstract

A technique based on an iterative scheme and a current-based method has been developed to determine the scattering and propagation characteristics of arbitrary structures and environments. To obtain a high degree of accuracy, parametric surfaces (NURBS) have been used to model the body surface. The technique solves the MFIE (Magnetic Field Integral Equation) defined over the body surface. The aim of the method is to make the analysis avoiding the memory and CPU time restrictions imposed by low frequency methods such as Method of Moments. Approximate expressions, based on dipole moment formulations, are applied to speed-up the calculations. Two initial guesses for the CGM (Conjugate Gradient Method) have been compared in order to see which one presents the best relationship between convergence and CPU time. Results are presented showing the behavior of the developed methods comparing them with measurements and other electromagnetic methods