Electromagnetic scattering from arbitrarily shaped conducting bodies coated with a thin layer of lossy magnetic material

An efficient moment solution is given for the problem of electromagnetic scattering from an arbitrarily shaped, three-dimensional conducting body coated with a thin layer of lossy magnetic material. The surface equivalence principle is used to replace the conductor with a surface electric current and the volume equivalence principle is used to replace the coating with a magnetic volume current. The behaviour of the field in the thin coating justifies approximating the volume current by a surface magnetic current residing next to the surface electric current. The boundary condition on the tangential component of the total magnetic field is used to express the magnetic surface current in terms of the electric surface current. The boundary condition on the tangential component of the electric field is then used to obtain an integral equation for the surface current. The method of moments is used to solve this equation approximately. The computed numerical results are in excellent agreement with the exact data for the case of a spherical scatterer