理想导体半圆柱TE波散射的混合法解

本文应用混合技术分析了在TE平面波激励下,理想导体半圆柱的双站散射。该混合技术是把半圆柱劈附近的电流表示为未知数,圆柱曲面上的一阶电流应用Fock理论求解,高阶绕射电流表示为含有未知系数的Fock型函数。圆柱平面上的一阶电流用物理光学近似和曲劈的一致性几何绕射理论得到。劈的二阶绕射电流表示为含有未知系数的GTD形式。然后通过磁场积分方程,运用简单矩量法求得劈附近的电流和未知的绕射系数。最后计算了理想导体半圆柱的双站散射截面,结果与矩量法的结果吻合得相当好。

A HYBRID METHOD FOR TE SCATTERING BY A PERFECTLY CONDUCTING SEMICYLINDER

Bistatic scattering of a perfectly conducting semicylinder is analysed by using a hybrid method. In the hybrid method, the currents in the close vicinity of edges are represented as unknown coefficients; the first-order currents on the curved face are obtained by Fock theory; the high-order currents are described as the Fock type functions involving two unknown coefficients. The first-order currents on planar surface are physical optical currents and diffraction currents obtained by the uniform geometrical theory of diffraction; the second-order currents are expressed in the geometrical theory of diffraction form involving two unknown coefficients. The magnetic field equation is solved to obtained four coefficients and the currents in the close vicinity of the edges. The results obtained by the hybrid method are in good agreement with the results of moment method.