有限厚度周期孔径阵列电磁特性的加速分析

Accelerated analysis to EM property of periodic aperture array with finite thickness

将有限厚度周期结构的电磁散射问题分解为外部问题和内部问题,采用混合位积分方程(MPIE),用Ewald变换对周期格林函数进行加速,提高计算效率;在内部问题的分析中,为简化积分方程,通过零厚度近似,并引入厚度修正项,完成了从有限厚度至零厚度的平滑过渡。与采用传统MOM-IE方法的结果对比,新方法的结果吻合良好,说明了此方法在有限厚度周期结构电磁散射分析中的有效性。

Scattering problem of periodic structure with finite thickness can be divided into the outer problem and the inner problem. Used by MPIE, the computation efficiency can be improved through the acceleration of periodic Green＇s function with Ewald transform. In the analysis of inner problem, an approximation from the case of finite thickness to infinite thinness is performed for the simplification of IE （Integral Equation）, and the smoothed transition from the case of finite thickness to infinite is accomplished with the correcting term about the thickness. Comparing the result using MOM-IE with new method, good agreement shows the validity for the analysis of scattering problem in the periodic structure with finite thickness using new method.