Alternative Characteristic Mode Formulation for Dielectric Coated PEC Objects

Alternative characteristic mode formulations based on the surface integral equations are developed to analyze the modal features of dielectric coated perfectly electrically conducting (PEC) objects. The external electric, magnetic or combined field integral operators are merely applied on the external interface of dielectric zone, while the electric integral equation is employed on the PEC surface. Numerical results are provided to verify the accuracy of the proposed method.