US 12,230,883 B2
Antenna array with cross-polarization leakage suppression
Torleif Martin, Linköping (SE); and Omid Sotoudeh, Linköping (SE)
Assigned to REQUTECH AB, Linkoping (SE)
Appl. No. 17/927,858
Filed by REQUTECH AB, Linköping (SE)
PCT Filed May 26, 2021, PCT No. PCT/EP2021/063976
§ 371(c)(1), (2) Date Nov. 25, 2022,
PCT Pub. No. WO2021/239776, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2030176-8 (SE), filed on May 28, 2020.
Prior Publication US 2023/0208022 A1, Jun. 29, 2023
Int. Cl. H01Q 21/24 (2006.01); H01Q 1/28 (2006.01)
CPC H01Q 21/245 (2013.01) [H01Q 1/288 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for improving cross-polarization discrimination in a dual-polarized antenna array, the antenna array comprising a plurality of antenna elements, each antenna element comprising at least two feeding ports arranged to excite the antenna element with mutually independent signals having respective complex amplitudes, the method comprising:
measuring, for each of the feeding ports and for each antenna element, 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;
selecting a desired circular polarization in the far field to be either right-handed or left-handed circular polarization;
determining, 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 of each antenna element, the ratio being associated with an increased cross-polarization discrimination; and
exciting the antenna elements with signals having complex amplitudes according to the determined ratio.