Multi-layered efficient RFID coupler
First Claim
1. 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, andan 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.
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Accused Products
Abstract
A RFID coupler capable of selectively communicating with a targeted transponder from among a group of multiple adjacent transponders. The coupler includes a grounded terminal load, a coupling element, a connecting element, an impedance matching element, and an input terminal. The coupling element is connected with the grounded terminal load and is configured to couple with the transponder by emanating an electromagnetic field. The input terminal is connected to a transceiver for receiving communication signals. The impedance matching element is connected to the input terminal and is configured to substantially match an input impedance of the coupler to a source impedance of the transceiver. The connecting element connects the impedance matching element to the coupling element. The coupling element and the impedance matching element are substantially parallel and separated by at least one dielectric layer and at least one ground plane.
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Citations
20 Claims
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1. An RFID system for selectively communicating with a targeted transponder from among a group of multiple adjacent transponders, the system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A coupler configured to couple a transceiver with a transponder, said coupler comprising:
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an input terminal structured to receive an input signal from the transceiver; a grounded terminal load, a coupling element electrically connected with said grounded terminal load and configured to couple with the transponder, an impedance matching element electrically connected with said input terminal and configured to substantially match an input impedance defined by said coupler to a source impedance defined by the transceiver, and a connecting element for electrically connecting said impedance matching element to said coupling element, 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. - View Dependent Claims (10)
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11. A RFID printer-encoder for printing and programming a series of media units wherein at least one of the media units include at least one transponder;
- said printer-encoder comprising;
a printhead for printing indicia onto the media units; a media conveyance adapted to transport the series of media units including the at least one transponder to said printhead and to a transponder operating region; a transceiver configured to generate communication signals, said transceiver defining a source impedance; and a near field coupler defining an input impedance, said near field coupler configured to receive the communications signals from the transceiver and selectively communicate with a transponder in the transponder operating region, said near field coupler includes a microstrip line extending from an input terminal to a terminal load, said microstrip line having at least a first region and a second region separated by a plurality of dielectric layers and at least one ground plane, wherein the first region is configured to substantially match the input impedance to the source impedance and the second region is configured to generate a near field signal to couple with the transponder in the transponder operating region. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- said printer-encoder comprising;
Specification