用特征散射方向图预估电大平面阵的散射

Prediction of the Antenna Array Scattering by AESP

利用平面照射波在无限大周期阵列上感应电流的周期特性,对无限阵列格林函数加窗的方法得到了有限阵列的格林函数,从而将电大有限阵列的分析缩减到单个的阵元上。进而由矩量法得到单个阵元上的电流分布和散射场,并定义为单元的特征散射方向图。仿照阵列综合理论,整个阵列的散射归结为特征散射方向图和阵因子的乘积,极大的简化了电大有限阵列的散射分析,并通过算例验证了该方法的有效性。

When plane wave illuminates a infinite periodic array, periodic current will be induced on it. Assuming the finite array is a part of an infinite array, then the Green function of the finite array can be obtained by windowing the Green function of the infinite array, thus the analysis of the finite array can be reduced to that of a single element. Moment method is used to calculate the element current and scattered field, and we define this scattered field as the Active Element Scattering Pattern（AESP）. According to the pattern synthesis theory, the scattering of the whole array is the multiplication of the AESP and an array factor, so the analysis of electrically large finite array is greatly simplified. Numerical results are presented to show the validity of the approach.