System and method for selective communication with RFID transponders
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United States of America Patent
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Feb 1, 2005
Grant Date -
Sep 16, 2004
app pub date -
Mar 11, 2003
filing date -
Mar 11, 2003
priority date (Note) -
In Force
status (Latency Note)
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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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