NUMERICAL SOLUTION OF SCATTERING FROM THIN DIELECTRIC-COATED CONDUCTORS BASED ON TDS APPROXIMATION AND EM BOUNDARY CONDITIONS

Abstract

Thin dielectric sheet (TDS) approximation and electro- magnetic (EM) boundary conditions are considered together to de- rive out a set of integral equations as an alternative to the impedance boundary condition (IBC) method to solve the electromagnetic scat- tering from thin dielectric-coated conductors. Only with discretizing the induce current on the conductor surfaces and solving an integral equation similar to that for a perfect electric conductor (PEC), the scattering flelds from the whole coating system (electric or magnetic material coating) are computed. Both the electric fleld integral equa- tion (EFIE), magnetic fleld integral equation (MFIE) and their combi- nation form are presented. These equations are converted to a matrix equation by Galerkin's method and then solved with multilevel fast multipole algorithm (MLFMA) to obtain the far flelds scattering from these coated objects.