US 11,736,209 B1
Antenna array system with directional couplers for calibration
Ofer Bar Shalom, Kiryat Ono (IL); Igal Kotzer, Tel Aviv (IL); and Ofer Givati, Hertzliya (IL)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Mar. 23, 2022, as Appl. No. 17/701,750.
Int. Cl. H04B 17/00 (2015.01); H04B 17/21 (2015.01); H01Q 3/26 (2006.01)
CPC H04B 17/21 (2015.01) [H01Q 3/267 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An antenna array system comprising:
a receiver having a plurality of receiving chains adapted to receive signals from corresponding receiver antennas;
a respective directional coupler positioned in proximity to each of the plurality of receiving chains;
wherein the plurality of receiving chains is adapted to receive a respective pilot signal through the respective directional coupler, the respective pilot signal being transmitted simultaneously;
a controller having a processor and tangible, non-transitory memory on which instructions are recorded, the controller being adapted to select one of the plurality of receiving chains as a reference channel; and
wherein the controller is adapted to perform calibration for the plurality of receiving chains based on the respective pilot signal, including obtaining respective chain phase values and respective gain factors.