由散射数据计算数值绕射系数  

Numerical Diffraction Coefficient Derived from FDTD Data

作　　者：葛德彪[1] 朱之伟[1] 石守元 

机构地区：[1]西安电子科技大学物理系

出　　处：《电波科学学报》1995年第4期1-6,共6页Chinese Journal of Radio Science

基　　金：电科院预研基金;国防科工委基金

摘　　要：本文研究数值一致性绕射系数的提取方法。在建立散射模型并确认其散射中心后，用ＦＤＴＤ方法计算散射场，并通过电流加窗方法或联立方程组方法以提取所关心散射中心的一致性绕射系数。金属板边缘的例子验证了这一途径的可行性。最后，用这种方法获得了涂层金属板的一致性统射系数，其结果与阻抗劈的ＵＴＤ结果一致。In the scattering computations at high frequency by UTD, the contribution of a scattering center is represented by the Diffraction coefficient (DFC). However, the DFC can be expressed in closed form only for limited canonical cases. To derive the DFC for other cases, for instance, for the wedges with l～y dielectric coverageor impedance beading, we have to invoke numerical schemes.In this paper the numerical methods for derivation of uniform diffraction coefficients are describe. First an object is designed which includes the scatteting centers of interest. The scattered field of the object is computed by the FDTD method. The scattered field can be,on the other hand, expressed by using the DFC from viewPOint of UTD. The derivation of DFC from FDTD data is, in fact, an inverse problem. By using the method of windowing Current or by approach to solving simultaneous equations the contribution of scattering center of interest may be isolated from other chattering centers. The numerical diffraction coefficient of the scattering center under investigation is then obtained. Using of these methods yields numerical uniform diffraction coefficients for the edge of conducting strip snd the one coated by absorbing material. The examples show the feasibility of the present method.

关 键 词：绕射系数 阻抗劈 散射 几何绕射理论 

分 类 号：TN011[电子电信—物理电子学]