Patent ID: 8289165

Claim:
An RFID device comprising: an RFID chip having an input capacitance, and having a predetermined UHF frequency or range of frequency of operation for sending and receiving signals; an RFID loop antenna electrically coupled to the RFID chip, wherein the RFID loop antenna has an enclosed area greater than 1 cm 2 , wherein the antenna on its own has an unmodified inductance that is at least 20% greater than a desired inductance or range of inductances that would achieve resonance with the input capacitance, at the frequency or range of frequencies; and a conductive loop operatively coupled to the RFID loop antenna, without being in contact with the RFID loop antenna which produces a distributive capacitance that modifies the loop antenna's inductance; wherein the RFID loop antenna and the conductive loop together couple to a chip with a modified inductance that is within 5% of the desired inductance or range of inductances.