INTEGRAL-EQUATION SOLUTION OF SCATTERING FROM PARTIALLY COATED CONDUCTING BODIES OF REVOLUTION

Many problems in radar scattering and antenna design involve complex material objects made of conductors, dielectrics and, more recently, magnetic materials. Analytical solutions are available for only a few special geometries and almost always a numerical method must be employed to study realistic problems. For the solution of conducting or dielectric objects, numerous publications are available in the literature. Recently, several results have been published for the electromagnetic scattering from objects comprised of both conductors and dielectrics as well as for conductors coated with lossy dielectric materials. In comparison however, relatively few studies have been made of scattering objects comprised of lossy magnetic materials. Usually an impedance boundary condition approximation is used to formulate this problem. In this paper, a method of moments formulation for the scattering and radiation analysis of single or multiple bodies made of conducting and lossy dielectric materials, or conducting and lossy magnetic materials is presented. Based on this formulation, a simulation code has been developed which is specialized for the analysis of rotationally symmetric geometries. The numerical solution is obtained using an integral-equation formulation, for which several different forms can be selected. Numerical results for the scattering from conducting objects partially coated with a lossy dielectric material as well as conducting objects partially coated with a lossy magnetic material will be presented.