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

作　　者：余定峰[1] 何思远[1] 付松[1] 朱国强[1] 殷红成 王超 

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]电磁散射重点实验室,北京100854

出　　处：《系统工程与电子技术》2012年第12期2428-2432,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(61001059;60671040);教育部博士研究生学术新人奖(5052011207017);中央高校基本科研业务费专项资金;中国博士后科学基金资助课题

摘　　要：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.

关 键 词：电磁散射 各向同性 物理光学 等效边缘流 

分 类 号：TM15[电气工程—电工理论与新技术]