大型平面阵列天线散射场的快速计算方法

Fast Method for Calculating the Scattering from Large Plane Arrays

基于子阵思想,提出利用小型平面阵列中的各天线单元的散射场,来等效大型平面阵列中相似阵列环境下的各单元的散射场,进而利用叠加定理来计算大型阵列的总散射场.并通过公式推导,进一步简化了该方法的操作过程,将大型平面阵列的散射计算问题转化为四个小型平面阵列的散射总场计算问题,显著减小了计算量,同时避免了逐个计算单元场而带来的操作复杂度.计算结果与HFSS仿真结果基本一致,验证了方法的正确性.

This paper proposes a novel method for fast calculating the scattering pattern of large plane arrays. In this method, the induced element patterns of large plane array are constructed from those of a small plane subarray. Then the scattered field of the large plane array is obtained by summing over the induced element pattern of all elements. Furthermore, the method is modified to reduce the computational burden. The expression of the modified method is derived and the large plane array analysis problem is converted into four simplified small plane array problems. In addition, the effects of the mutual coupling and the surrounding array environment are rigorously taken into account. Example arrays of horn antennas are analyzed to assess the proposed method. The calculated results agree well with the ones simulated by HFSS.