厚金属板与台阶的散射

Scattering of the thick metallic plate and step

将每种极化的照射分解为对称与反对称照射之和 ,从而将厚金属板的散射问题化为两种台阶的散射问题。用Wiener Hopf法求得散射场的Fourier变换后 ,从中减去表面均匀电流的辐射场的Fourier变换 ,应用鞍点法即可求得棱边的散射场。根据线电流与电偶极辐射场的关系 ,由无限长棱边的场反推得微元的场。

The irradiation of each kind of polarization is divided into the sum of symmetric and asymmetric irradiation, and the scattering problems of thick plate are transformed to two kinds of scattering problems of steps. By using the Wiener-Hopf method, Fourier transforms of the scattering fields due to the induced surface currents are obtained, after this, Fourier transforms of the radiating fields due to the uniform surface currents are subtracted. Applying the saddle-point method, the scattering fields of the edges can be obtained. According to the relation between the radiating fields of line current and dipole, the radiating fields of the edge elements are obtained by reversion from the scattering fields of the infinite edges. The results can be used to the finite curved edges with small curvature.