Patent ID: 8659396

Claim:
A method for use with a base station comprising a tunable area-reading antenna and myriad RF tags nearby, the method comprising the steps of: transmitting a power/clock field from the antenna at a first frequency below 1 MHz, thereby providing power and clock to a plurality of the RF tags; while the power/clock field is being transmitted, first transmitting a data signal from the antenna at a second frequency, the second frequency higher than the first frequency and below 1 MHz, and receiving a response from at least a first one of the RF tags at the antenna while not receiving a response from at least a second one of the RF tags; impedance tuning the antenna differently than during the first transmitting; while the power/clock field is being transmitted, for a second time transmitting a data signal from the antenna at the second frequency, and receiving a response from the at least a second one of the RF tags at the antenna.