ANTENNA ARRAY WITH CROSS-POLARIZATION LEAKAGE SUPPRESSION

摘要

A method for improving cross-polarization discrimination in a dual-polarized antenna array (100). The antenna array (100) comprises a plurality of antenna elements (110), each antenna element (110) comprising at least two feeding ports (101, 102) arranged to excite the antenna element with mutually independent signals having respective complex amplitudes. The method comprises determining (S1), for each of the feeding ports (101, 102) and for each antenna element (110), an electromagnetic far field resulting from excitation of the antenna element by the feeding port in terms of field components corresponding to two orthogonal linear polarizations and selecting (S2) a desired circular polarization in the far field to be either right-handed or left-handed circular polarization. The method also comprises determining (S3), based on a predetermined relationship between the field components corresponding to the two orthogonal linear polarizations and on the desired circular polarization in the far field, a ratio between the complex amplitudes of excitation of the feeding ports (101, 102) of each antenna element (110), wherein the ratio is associated with an increased cross-polarization discrimination, and exciting (S4) the antenna elements (110) with signals having complex amplitudes according to the determined ratio.