Inventors:
William N. Carr - Montclair NJ, US
James R. Cooper - Atlanta GA, US
International Classification:
G06K 19/077, H01Q 1/50
Abstract:
A tag for a radio frequency Identification RFID system that comprises an open cavity with an integral load element. The load element is comprised of an impedance matching network and a load circuit. The load circuit contains one or more of an RFID transponder, microcontroller, capacitive sensor circuit, resistive sensor circuit, complex impedance sensor circuit, and an RF energy scavenging circuit in specific implementations. In various embodiments the tag includes reflector elements which enable the antenna structure to better tolerate the presence of nearby metal objects and provide electromagnetic gain.