Patent ID: 7482926
Filing Date: 2009-01-27
Classification: G06K

Abstract:
1. A radio frequency identification reader operable to communicate with RFID tags, the radio frequency identification reader comprising: a reader antenna; a variable radio frequency source operable to generate carrier waves at a plurality of carrier wave frequencies; a controller operable to from time-to-time, determine a new carrier wave frequency, the new carrier wave frequency being different from a current carrier wave frequency that at least approximately matches a current tag resonant frequency of at least one of the RFID tags, and generate change frequency instructions indicative of an instruction to change a tag resonant frequency from the current tag resonant frequency to at least approximately match a new tag resonant frequency; and a transmitter configured to modulate the carrier waves having the current carrier wave frequency with the change frequency instructions to transmit a change frequency radio frequency signal via the reader antenna.