US 12,267,127 B2
Termination circuit for low power backscatter communication
Manideep Dunna, La Jolla, CA (US); Miao Meng, La Jolla, CA (US); Patrick P. Mercier, La Jolla, CA (US); and Dinesh Bharadia, La Jolla, CA (US)
Assigned to The Regents of the University of California, Oakland, CA (US)
Filed by The Regents of the University of California, Oakland, CA (US)
Filed on Feb. 7, 2022, as Appl. No. 17/666,198.
Claims priority of provisional application 63/146,071, filed on Feb. 5, 2021.
Prior Publication US 2022/0255587 A1, Aug. 11, 2022
Int. Cl. H04B 5/00 (2024.01); H04B 5/72 (2024.01); H04B 5/77 (2024.01); H04B 5/79 (2024.01); H04W 52/02 (2009.01); H04B 7/0413 (2017.01)
CPC H04B 5/77 (2024.01) [H04B 5/72 (2024.01); H04B 5/79 (2024.01); H04W 52/0203 (2013.01); H04B 7/0413 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A termination circuit for backscatter communication in an integrated wake-up receiver tag device, the termination circuit comprising:
a first branch comprising,
a first connection to an antenna;
a first switch between the first connection and an open load that is connected between the first switch and ground, wherein the first switch is controlled by a first phase of an intermediate frequency signal of the tag device; and
a second switch between the first connection and a shorted load that is connected between the second switch and ground, wherein the second switch is controlled by a second phase of the intermediate frequency signal of the tag device; and
a second branch comprising,
a second connection to the antenna;
a third switch between the second connection and a capacitive load that is connected between the third switch and ground, wherein the third switch is controlled by a third phase of the intermediate frequency signal of the tag device; and
a fourth switch between the second connection and an inductive load that is connected between the fourth switch and ground, wherein the fourth switch is controlled by a fourth phase of the intermediate frequency signal of the tag device.