System and Method for Selective Communication with RFID Transponders
First Claim
1. A method of establishing communication between a transceiver and a single RFID transponder located in a predetermined confined transponder target area, comprising:
- generating a magnetic flux field which varies in response to a radio frequency input signal; and
collecting and forming said magnetic field pattern in the location of said transponder target area; and
establishing at predetermined power levels of the transceiver a mutual magnetic coupling which is selective exclusively for a single transponder located in said transponder target area.
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Accused Products
Abstract
A system having an RFID transceiver is adapted to communicate exclusively with a single RFID transponder located in a predetermined confined transponder target area. The system includes a magnetic coupling device comprising a magnetic flux generator responsive to a radio frequency input signal and a magnetic field pattern former. The pattern former is configured to collect flux produced by the flux generator and to form a field pattern in the location of the transponder target area. The system establishes, at predetermined transceiver power levels, a mutual magnetic coupling which is selective exclusively for a single transponder located in the transponder target area.
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Citations
38 Claims
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1. A method of establishing communication between a transceiver and a single RFID transponder located in a predetermined confined transponder target area, comprising:
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generating a magnetic flux field which varies in response to a radio frequency input signal; and
collecting and forming said magnetic field pattern in the location of said transponder target area; and
establishing at predetermined power levels of the transceiver a mutual magnetic coupling which is selective exclusively for a single transponder located in said transponder target area. - View Dependent Claims (2, 3, 4)
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5. A magnetic coupling device, comprising:
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a coil having a first side and a second side;
a magnetic field pattern former; and
the magnetic field pattern former covering the first side of the coil and at least a portion of the second side of the coil. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A planar coil printed circuit board magnetic coupling device, comprising:
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a first trace on the printed circuit board forming the planar coil;
a first RF shield, the first RF shield insulated from and covering a first side of the first trace;
a second RF shield, the second RF shield insulated from and covering a second side of the first trace; and
a magnetic field pattern former covering a first side of the printed circuit board area covered by the first trace and at least a portion of a second side of the printed circuit board area covered by the first trace. - View Dependent Claims (18, 19, 20, 21)
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22. A method for increasing planar selectivity of a magnetic coupling device, comprising the steps of:
covering an area of the magnetic coupling device where a magnetic field emanation is not desired with a magnetic field pattern former. - View Dependent Claims (23, 24, 25)
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26. A transponder communication selective module, comprising:
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a magnetic coupling device partially covered by a magnetic field pattern former;
located proximate a media feed path;
the media feed path arranged to carry a plurality of transponders sequentially past the magnetic coupling device. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A system for sequentially communicating with a plurality of RFID transponders, comprising:
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a magnetic coupling device located proximate a media supply path arranged to transport RFID transponders sequentially past the magnetic coupling device;
the magnetic coupling device having a magnetic field pattern former arranged to minimize magnetic flux emanation away from the magnetic coupling device, except through a gap; and
the gap dimensioned to enable inductive coupling with only a single RFID transponder at a time.
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37. A method for selectively communicating with a desired RFID transponder among a plurality of RFID transponders, comprising the steps of:
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energizing a magnetic coupling device; and
passing the desired RFID transponder through a magnetic flux field generated by the magnetic coupling device;
the magnetic coupling device covered on a first side and at least a portion of a second side by a magnetic field pattern former whereby a magnetic flux field generated by the magnetic coupling device is in an area small enough so that only the desired RFID transponder is energized. - View Dependent Claims (38)
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Specification