Spatially Selective UHF Near Field Microstrip Coupler Device and RFID Systems Using Device
First Claim
1. A printer including a transceiver adapted to communicate with transponders, comprising:
- a printhead;
a media conveyance adapted to transport a series of discrete media to said printhead and through a transponder operating region, at least some of said media including a transponder;
a near field coupler configured to generate a near field effect to couple with the transponder for data transfer;
the near field coupler having a plurality of lines electrically interconnected in parallel, and a spaced away ground plane.
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Accused Products
Abstract
A system having a UHF RFID transceiver is adapted to communicate exclusively with a single electro-magnetically coupled transponder located in a predetermined confined transponder operating region. The system includes a near field coupling device comprising a plurality of lines connected in parallel with an unmatched load. The near field coupling device may be formed, for example on a printed circuit board with a plurality of electrically interconnected traces and a ground plane. The system establishes, at predetermined transceiver power levels, a mutual electro-magnetic coupling which is selective exclusively for a single transponder located in a defined transponder operating region. Also included are methods for selective communication with the transponder in an apparatus such as a printer-encoder.
94 Citations
30 Claims
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1. A printer including a transceiver adapted to communicate with transponders, comprising:
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a printhead;
a media conveyance adapted to transport a series of discrete media to said printhead and through a transponder operating region, at least some of said media including a transponder;
a near field coupler configured to generate a near field effect to couple with the transponder for data transfer;
the near field coupler having a plurality of lines electrically interconnected in parallel, and a spaced away ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising an RFID transceiver and adapted to communicate exclusively with a single transponder located in a predetermined transponder operating region, said system comprising:
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a near field coupler having a spatially selective near field property extending into the transponder operating region;
the system configured to establish at predetermined transceiver power levels a mutual coupling which is selective exclusively for a single transponder located in said transponder operating region. - View Dependent Claims (10)
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11. A method of establishing communication between a transceiver and a single transponder located in a predetermined confined transponder operating region, comprising:
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generating a near field in an transponder operating region which varies in response to a radio frequency input signal; and
establishing at predetermined power levels of the transceiver a mutual coupling which is selective exclusively for a single transponder located in said transponder operating region. - View Dependent Claims (12, 13, 14)
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15. A near field coupling device, comprising:
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a plurality of lines electrically interconnected in parallel;
a ground plane spaced away from the plurality of lines; and
a terminating resistor coupled to the lines, the terminating resistor selected not to match a characteristic impedance of the plurality of lines. - View Dependent Claims (16, 17, 18, 19)
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20. (canceled).
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21. A near field coupler for communication with an transponder located in a transponder operating region, comprising:
a near field coupler receiving an RF communication signal and configured to produce an array of spaced near field concentrations responsive to the RF communication signal, the spacing of said near field concentrations along a predetermined direction being significantly less than a smallest dimension of said transponder in said predetermined direction such that said transponder overlaps and is excited by a plurality of said field components when located in said transponder operating region. - View Dependent Claims (22, 23, 24, 25)
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26. A method for communication with an transponder, comprising the steps of:
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a) positioning an transponder in a transponder operating region with a transponder axis oriented along a predetermined direction, the smallest dimension of said transponder in said predetermined direction being significantly less than a dimension of said transponder operating region in said predetermined direction;
b) with an RF communication signal, forming an array of near field concentrations in said transponder operating region, said near field concentrations extending transversely to said predetermined direction and spaced along said predetermined direction; and
c) communicating with said transponder with said RF encoding signal, d) the spacing of said near field concentrations in said predetermined direction being significantly less than said smallest dimension of said transponder in said predetermined direction such that said transponder overlaps and is excited by a plurality of said near field concentrations when located in said transponder operating region. - View Dependent Claims (27)
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28. A method for communication with an transponder comprising the steps of:
positioning the transponder over a spaced array of near field concentrations of an RF communication signal, the spacing of said near field concentrations being such relative to the dimensions of said transponder that said transponder overlaps and is excited by a plurality of said near field concentrations.
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29. A method for communication with an transponder comprising the steps of:
positioning the transponder over a parallel array of leaky edges having near field concentrations of an RF communication signal, the spacing of said near field concentrations being such relative to the dimensions of said transponder that said transponder overlaps and is excited by a plurality of said near field concentrations.
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30. A method of adaptively communicating with an transponder comprising the steps of:
Specification