US 11,817,633 B2
Multipath robust antenna design for phase-based distance measurement
Zhuohui Zhang, Tustin, CA (US); and Kiran Uln, Pleasanton, CA (US)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Aug. 24, 2021, as Appl. No. 17/410,293.
Prior Publication US 2023/0064650 A1, Mar. 2, 2023
Int. Cl. H01Q 3/44 (2006.01); H01Q 19/00 (2006.01); H04B 1/10 (2006.01); H01Q 3/24 (2006.01)
CPC H01Q 3/247 (2013.01) [H01Q 3/44 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method, comprising:
steering, by a communication device, an antenna unit into a first direction to cause the antenna unit to generate a first constant tone (CT) signal based on a plurality of multipath signals;
performing, by the communication device, a phase measurement on the first CT signal to generate a first phase measurement value;
steering, by the communication device, the antenna unit into a second direction to cause the antenna unit to generate a second CT signal based on the plurality of multipath signals;
performing, by the communication device, a phase measurement on the second CT signal to generate a second phase measurement value;
determining, by the communication device based on the first phase measurement value and the second phase measurement value, a change in multipath interference at the antenna unit among the plurality of multipath signals; and
re-steering, by the communication device responsive to determining the change in multipath interference, the antenna unit into the first direction.