Electromagnetic field scattering by an inhomogeneous composite circular cylinder

Abstract

The scattering of electromagnetic field by an inhomogeneous composite cylinder is presented. The inhomogeneous composite circular cylinder is illuminated by a line source or plane wave in free space. The analysis of the problem involves applying the field equivalence principle to derive for each excitation (TE or TM) a system of coupled integral equations for the equivalent magnetic currents on the dielectric interfaces. The integral equations are solved by Galerkin's method. The far-scattered field and the radar cross section for both polarization are obtained in terms of the equivalent magnetic currents on the dielectric interfaces. The analysis is specialized to the problem of a conducting strip loaded by an inhomogeneous dielectric cylinder, as well as to the case of plane wave excitation. It is also shown that the radar cross section is reduced by increasing the dielectric constant of the dielectric portions of the composite circular cylinder.<>