Patent ID: 9342716
Filing Date: 2016-05-17
CPC Classification: G06K

Claim Text:
1. A method of reading a radio frequency identification (RFID) tag, the method comprising: transmitting a search signal comprising a broadband signal covering the entire bandwidth of an RFID band; selecting a target frequency in the RFID band based on a response to the search signal; generating in a processor a digital representation of an interrogating signal, the interrogating signal comprising a baseband signal and a carrier signal having the selected target frequency; converting the digital representation of the interrogating signal to an analog signal in a digital-to-analog converter (DAC); providing the analog signal to a selected antenna from one of at least two antennas, a first one of the at least two antennas associated with the RFID band and a second one of the at least two antennas associated with a different RFID band; broadcasting the analog signal using the selected antenna; detecting a response from the RFID tag by measuring a change in a voltage on the selected antenna; and reading the RFID tag.