Bias Correction for Polarization Measurement in Phased Array Antenna Via Pattern Reconstruction Method

A reconstruction technique of the antenna pattern for correcting the polarization measurement bias is proposed in this paper. In the case of the prior knowledge of patterns at some scanning angles, the pattern at other beam position can be estimated by application of the minimum norm least-square solution. Once the pattern is reconstructed, the corresponding projection matrix could be obtained in the presence of the mutual coupling and edge effects in the polarimetric phased array antenna. Thereby, the correction matrix for the polarization scattering matrix is repaired. A microstrip patch array antenna is designed to demonstrate the validity of the proposed method, and the performance of bias correction is manifested using several polarimetric variables. Specifically, the bias of differential reflectivity (Zb DR), the bias of linear depolarization ratio (LbDR) and the phase difference are less than 0.14 dB, 46.85 dB, 3.31° in a wide scanning angle range, respectively.