Station, a passive portable object and apparatus for the remote exchange of information between the passive portable object and the station
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United States of America Patent
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Nov 17, 1998
Grant Date -
N/A
app pub date -
Sep 5, 1996
filing date -
Sep 6, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for the exchange of information by electromagnetic coupling between a passive portable object and a station comprising: first electromagnetic coupling means for the transmission of data between the portable object and the station, and second electromagnetic coupling means independent of the first means for the transfer of energy and a clock signal to the portable object. A filtering circuit is provided on the station side, which behaves as an inductance at the frequency associated with the data transmission and as a high value impedance at the frequency associated with the energy transfer.
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