一维FSS电磁散射宽带特性的快速计算

基于渐近波形估计（AWE）技术和矩量法（MOM），快速分析了一维频率选择表面（FSS）的宽带电磁散射特性，首先采用MOM法将平面波照射下FSS的电场积分方程（EFIE）转化为关于感应电流的矩阵方程，并由该方程确定频率导数矩阵方程（MEFD）；再在所考虑的频带内的某一给定频率处求解MEFD，得到给定频率处的频率导数感应电流；最后根据Pade逼近理论由给定频率处的频率导数感应电流确定周期性结构在任意频率入射波照射下的感应电流，根据FSS上的感应电流及谱域Floquet谐波模计算FSS的电磁散射宽带特性，计算结果表明，AWE能有效逼近MOM逐点扫描计算的结果，同时在计算速度上可加快十几倍。

Fast calculation of the broadband electromagnetic scattering of one-dimensional frequency selective surfaces

The method of moments (MOM) in conjunction with the asymptotic waveform evaluation (AWE) technique is applied to calculate the broadband electromagnetic scattering performance of one-dimensional frequency selective surfaces (FSS) at first time. The electric field integral equation (EFIE) of FSS irradiated by electromagnetic (EM) wave is firstly discreted into the matrix equations of the equivalent currents using MOM, and the matrix equations of frequency derivative (MEFD) can be then obtained from the above matrix equations. In the AWE technique, the equivalent currents of frequency derivative at a given frequency within a frequency band are firstly obtained to find MEFD. The equivalent currents at any frequency within the frequency band can then be obtained from the equivalent currents of frequency derivative at given frequency via the Pade approximation. According to the equivalent currents and the Floquet harmonic of the spectral domain, the broadband EM scattering characteristics can be fast calculated. It was observed that the results of AWE can exactly approximate those of MOM that was calculated at every interested frequency, and AWE technique can result in considerable CPU time saving.