基于近场校正的相控阵天线低副瓣方向图综合

Low Sidelobe Pattern Synthesis of Phased Array Antenna Based on Near-field Calibration

相控阵天线单元存在着幅度和相位误差,这些误差的综合作用会导致天线方向图副瓣电平达不到优化设计结果。提出了一种基于近场幅相校正的相控阵天线低副瓣综合方法,首先采用近场单通道测量方法,得到相控阵天线阵面的实测幅相值;然后采用非线性二乘法对天线单元幅度和相位进行优化综合;最后根据优化幅相值对实测幅相值进行修正,获得相控阵天线阵面幅相配置参数。方向图实测结果表明该方法可行、有效。

Caused by the amplitude-phase error of phased array antenna elements,the pattern sidelobe is unable to meet the optimum design results. A low sidelobe pattern synthesis method based on near-field calibration is presented in this paper. First of all,the measurements of amplitude-phase are achieved by single channel near-field calibration. Secondly,the nonlinear least-square method is used to optimize the amplitude and phase of elements. Finally,the amplitude-phase configuration parameters are obtained,based on the correction of initial amplitude-phase with optimum amplitude and expected phase. The measured results show the proposed method is feasible and efficient.