	US 12,451,981 B1
	Apparatus, system, and method for calibrating impedance measurements for closed-loop tuning of wireless devices
Gordon Coutts, Woodinville, WA (US); Nivethitha Jayaraj, San Jose, CA (US); Nil Apaydin, Kirkland, WA (US); Liang Han, Sunnyvale, CA (US); and Jayakrishnan Vijayamohanan, Albuquerque, NM (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Dec. 14, 2022, as Appl. No. 18/065,924.
Int. Cl. H04B 17/00 (2015.01); H04B 17/21 (2015.01)

CPC H04B 17/21 (2015.01)

20 Claims

1. A system comprising:

a radio; and

a controller communicatively coupled to the radio, wherein the controller is configured to:

inject a signal into the radio while a plurality of reactive loads are applied to the radio;

calculate impedances of the radio relative to the reactive loads based at least in part on a characteristic of a reflection of the signal;

solve for one or more calibration coefficients based at least in part on the impedances and the reactive loads; and

calibrate the radio to account for the calibration coefficients.