基于PO-EEC的各向同性介质薄层涂覆目标电磁散射

Electromagnetic scattering from targets coated with thin layer of isotropic dielectric based on PO-EEC method

基于阻抗边界条件,将介质薄层涂覆目标等效为无厚度阻抗表面,应用三维各向同性阻抗面电磁散射的物理光学(physical optics,PO)算法,并通过各向同性阻抗劈的一致性几何绕射理论导出各向同性阻抗边缘的等效边缘流(equivalent edge currents,EEC),从而以边缘波场修正物理光学场,实现各向同性介质薄层涂覆三维导电目标电磁散射的高频预估。给出两个典型算例,与矩量法精确结果吻合良好,验证该各向同性PO-EEC算法的精度和效率。

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 isotropie 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 isotropie PO-EEC algorithm.