Patent ID: 7055753

Claim:
A method of testing a radio frequency identification (RFID) device, comprising: capacitively coupling an RFID device tester to an antenna of the RFID device; generating an outgoing signal from the RFID device tester; using the outgoing signal to power the RFID device; generating a return signal in the RFID device; detecting the return signal, via a reader that is part of the tester; and prior to the generating the outgoing signal, shifting an optimum operating frequency of the antenna from a natural resonant frequency of the antenna to a shifted resonant frequency; wherein the generating the outgoing signal includes generating the outgoing signal at a signal frequency that is different from the natural resonant frequency of the antenna; wherein the shifting the optimum operating frequency includes decreasing the optimum operating frequency; wherein the decreasing the optimum operating frequency includes overlapping portions of the antenna elements with dielectric elements; wherein the dielectric elements include a ceramic material; and wherein the ceramic material includes a material selected from the group consisting of barium tetra titanate and titanium oxide.