Abstract:

A target coated with a thin dielectric layer is equivalent to an unthickness impedance surface based on the impedance boundary condition. A physical optics (PO) method is proposed for the scattering from three-dimensional isotropic impedance surface. The equivalent edge currents (EEC) are derived from the uniform theory of diffraction (UTD) of isotropic impedance wedge to obtain an edge wave for isotropic impedance edge. High-frequency scattering from targets coated with a thin layer of isotropic dielectric can be obtained by adding the physical optics field with the contribution of edge wave. Numerical results agree well with the method of moments (MoM), which can verify the accuracy and efficiency of the proposed isotropic PO-EEC algorithm.