Solving the Scattering of Combined Conductor-Dielectric Bodies Based on EPA

This paper introduces a new method for analyzing the scattering from combined conductor-dielectric bodies based on equivalent principle algorithm (EPA). The object is decomposed into several different parts. In each part, it can be an inhomogeneous dielectric or a perfect electric conductor (PEC) of arbitrary shape. Equivalent surfaces (ES) are built for the interactions between each parts. And the current translation from the object to ES can be accelerated by the transformed multilevel fast multipole algorithm (MLFMA). Numerical result demonstrates the efficiency and accuracy of the proposed method.

I. Introduction

The analysis of electromagnetic scattering from combined conductor-dielectric bodies has attracted many attentions in the computational electromagnetics (CEM). An efficient method to solve this problem is the method of moments (MoM) based on the volume-surface integral equation(VSIE) [1], [2]. In VSIE, the interactions between the perfect electric conductor (PEC) and dielectric are considered directly through the integral between the PEC surface and dielectric volume, which leads to high computation complexity and large memory usage.