US 11,722,230 B2
Radio frequency handset calibration based on antenna gain
Wassim El-Hassan, San Jose, CA (US); Gurusubrahmaniyan Subrahmaniyan Radhakrishnan, San Jose, CA (US); Srinivasa Yasasvy Sateesh Bhamidipati, Milpitas, CA (US); Daphne Irene Gorman, San Jose, CA (US); Vineet Nayak, Sunnyvale, CA (US); and Xuefeng Zhao, Cupertino, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Oct. 8, 2020, as Appl. No. 17/65,829.
Claims priority of provisional application 63/062,132, filed on Aug. 6, 2020.
Prior Publication US 2022/0045772 A1, Feb. 10, 2022
Int. Cl. H04B 17/13 (2015.01); H01Q 3/34 (2006.01); H01Q 1/00 (2006.01); H04B 17/10 (2015.01); H01Q 23/00 (2006.01); H04W 52/22 (2009.01)
CPC H04B 17/13 (2015.01) [H01Q 1/002 (2013.01); H01Q 3/34 (2013.01); H01Q 23/00 (2013.01); H04B 17/102 (2015.01); H04W 52/228 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio frequency device comprising:
a plurality of antennas;
a plurality of transmitters configured to send a plurality of transmission signals through the plurality of antennas;
a plurality of power detectors coupled to the plurality of transmitters;
a memory configured to store an antenna gain lookup table including a plurality of antenna gains for the plurality of antennas associated with beamforming; and
one or more processors communicatively coupled to the plurality of transmitters, the plurality of power detectors, and the memory, and configured to
instruct the plurality of transmitters to send the plurality of transmission signals using a plurality of input powers to form a first beamformed signal having a first beam direction at a first frequency,
in response to receiving a back off power signal, measure a plurality of radio frequency integrated circuit gains associated with the plurality of transmitters,
determine the plurality of antenna gains associated with the plurality of antennas based on the first beam direction, the first frequency, and the antenna gain lookup table,
in response to measuring the plurality of radio frequency integrated circuit gains and determining the plurality of antenna gains, calculate a plurality of total transmission gains based on the plurality of radio frequency integrated circuit gains and the plurality of antenna gains, and
adjust the plurality of input powers based on the plurality of total transmission gains and the back off power signal.