斜入射下各向异性阻抗劈散射:表面波的绕射  

Scattering by wedge with anisotropic impedance faces at skew incidence:diffraction of surface waves

作　　者：李骥[1] 余定峰[1] 姚菁晶[1] 朱国强[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《系统工程与电子技术》2010年第9期1850-1853,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金(60671040)资助课题

摘　　要：各向异性阻抗劈的绕射研究对雷达探测、电波传播和高频天线设计等方面有着重要的意义。当平面波照射在各向异性阻抗表面上时,可能激励起导波模形式的表面波,在表面波的传播过程中,若遇到几何参数或者物理参数不连续的目标(例如劈边)则会产生绕射场。考虑到斜入射情况下电场与磁场的耦合,在一致性几何绕射理论(uniform geometrical theory of diffraction,UTD)框架内应用摄动原理,以及Van der Waerden方法得到斜入射情况下各向异性阻抗劈散射场中表面波的绕射场贡献。The research on the diffraction from a wedge with anisotropic impedance has great contribution to radar detection,electromagnetic wave propagation and the design of high-frequency antennas,etc.To study the scattering by an anisotropic impedance wedge at skew incidence,the field diffracted by the edge should increase the terms related to the excitation of surface waves.Considering the coupling of the electric field and the magnetic field,the perturbation technique based on classical uniform geometrical theory of diffraction（UTD） and Van der Waerden method are used to obtain a uniform expression for diffraction of the surface waves.

关 键 词：一致性几何绕射理论 各向异性阻抗 劈散射 绕射 

分 类 号：TM15[电气工程—电工理论与新技术]