US 12,353,939 B2
Long distance wireless radio tag with RF energy harvesting
Bhuvana Krishnaswamy, Madison, WI (US); Yaman Sangar, Madison, WI (US); and Kai Pederson, Palatine, IL (US)
Assigned to Wisconsin Alumni Research Foundation, Madison, WI (US)
Filed by Wisconsin Alumni Research Foundation, Madison, WI (US)
Filed on Nov. 7, 2023, as Appl. No. 18/503,253.
Claims priority of provisional application 63/382,947, filed on Nov. 9, 2022.
Prior Publication US 2024/0152722 A1, May 9, 2024
Int. Cl. G06K 19/077 (2006.01); G06K 19/07 (2006.01)
CPC G06K 19/07773 (2013.01) [G06K 19/0709 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A radio tag comprising:
a sensor input for receiving a sensed condition signal;
at least one antenna for receiving and/or transmitting radio power;
an energy harvesting circuit communicating with the at least one antenna to harvest radio power from the antenna and store the same;
a radio receiver communicating with the at least one antenna for extracting a query signal; and
a radio transmitter communicating with the at least one antenna to transmit an answer signal deriving power from the harvested radio power, the answer signal containing a value that changes based on the sensor input and the query signal.