关键词: 阵列天线, 阻抗矩阵, 散射矩阵, 阵列辐射方向图, 方向图综合

Abstract:

The relationships among the radiation pattern, mutual impedance and scattering matrices of array antennas are derived. Based on the expressions, a novel approach is presented to calculate the mutual impedance and the scattering matrices of an array utilizing commercial simulation software HFSS. In addition, an efficient and accurate method is proposed to calculate and synthesize the radiation pattern of large finite arrays. In this method, the mutual impedance matrix of the large array is deduced from a small array ignoring the coupling beyond the small array size. Once the mutual impedance matrix is obtained, the radiation pattern of the large array can be computed using the derived equations. In order to assess the accuracy and efficiency of the proposed method, an example array of 16 microstrip patch antennas is optimized with the genetic algorithm (GA) to minimize the maximum sidelobe level of the radiation pattern. Calculated results agree well with those simulated by HFSS.

Key words: antenna array, mutual impedance matrix, scattering matrix, array antenna radiation pattern, pattern synthesis