考虑互耦的半波振子线阵辐射和散射方向图综合

Synthesis of Array Radiation and Scattering Patterns Including Mutual Coupling

对于半波振子阵列天线,可用感应电动势法算得其阻抗矩阵,依据等效电路原理计入单元间的互耦计算辐射场.将其推广至考虑互耦的散射场计算,基于此辐射场和散射场的计算公式,提出一种考虑互耦同时综合半波振子阵列天线辐射和散射方向图的新方法.运用粒子群优化算法,通过优化振子的间距,同时综合指定辐射和散射方向图.运用该方法,通过对中心工作频率处的辐射和散射特性以及在威胁角度给定频带内的散射特性优化,有效降低半波振子阵在中心工作频率处的辐射和散射方向图的副瓣电平,并减小其在威胁角度给定频带内的雷达散射截面.计算结果与FEKO仿真结果吻合良好,验证方法的正确性.

An analytical formula for radiation field of dipole arrays based on equivalent circuit theory was verified in previous works.We extend this concept to field scattered by dipole arrays.Based on analytical formulas,a method is proposed to synthesize desired radiation and scattering patterns of dipole arrays simultaneously by optimizing element positions with PSO.To verify accuracy and effectiveness of the method,a linear dipole array is designed to obtain low side lobe level radiation and scattering patterns.Good agreement between results with the proposed method and FEKO validates accuracy of the method.Maximum sidelobe level of radiation and scattering patterns at operating frequency are both reduced by optimization.Furthermore,maximum levels of MRCS patterns in-band at threat angles are also considerably reduced.