Scattering of TM Excitation by Inhomogeneous Cylinders Near a Media Interface-A Hybrid Integral Equation Approach

Abstract

In this paper we present a hybrid surface/volume integral equation method solution of scattering from inhomogeneous lossy dielectric/ferrite cylinders near the planar interface separating two semi-infinite, homogeneous half-spaces. The inhomogeneous cylinders of general cross section are of infinite extent, their axes are parallel to the interface, and the excitation is transverse magnetic to their axes. Coupled hybrid integral equations are formulated by employing both surface equivalence principle and volume equivalence theorem. In the formulation, attention is focused on minimizing the computation of Sommerfeld integrals which is often encountered in dealing with buried objects, and on reducing the number of unknowns. A moment method numerical solution technique is developed for solving the formulated hybrid integral equations. From the calculated equivalent surface current, the far-zone scattered field is determined. Data showing the equivalent current distribution and the scattered field patterns are presented and discussed for selected cylinder and two half-space parameters.