Patent ID: 7425887

Claim:
An RFID system for selectively communicating with a targeted transponder from among a group of multiple adjacent transponders, the system comprising: a transponder conveyance adapted to transport at least one targeted transponder from a group of multiple adjacent transponders through a transponder operating region; a transceiver configured to generate communication signals, said transceiver defining a source impedance; and a near field coupler structured in electrical communication with said transceiver for receiving the communication signals, said coupler defining an input impedance and including, a grounded terminal load, a coupling element in electrical communication with said grounded terminal load and configured to transmit a near field electromagnetic field into the transponder operating region, and an impedance matching element in electrical communication with said coupling element and configured to substantially match the input impedance to the source impedance, wherein said coupling element and said impedance matching element are structured in a substantially parallel stacked arrangement and separated by at least one dielectric layer and at least one ground plane.