Patent ID: 9735464
Date: 2017-08-15
CPC Classifications: G01S,G06K,H01Q

Claim:
1. A tracking system, comprising: a transmitter configured to steer a radio frequency (RF) beam at a first frequency across a detection range; a radio frequency identification (RFID) tag configured to be switched from a non-readable state into a readable state based on the RFID tag that is located in the RF beam, wherein the RFID tag comprises a switch that selectively connects an RFID chip, that has a unique identifier, to an inductive loop; and an RFID reader configured to transmit a power signal at a second frequency to detect a location of the RFID tag based on the RFID tag that is switched into the readable state, wherein the RF beam is configured to sequentially steer at a series of spaced discrete angles.