Efficient object identification system
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United States of America Patent
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Dec 14, 1982
Issued Date -
N/A
app pub date -
Sep 8, 1981
filing date -
May 30, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system for the remote identification of objects using near-field electromagnetic coupling between an interrogator a transponder and a receiver in which a reply carrier at a subharmonic of the interrogation frequency is obtained by regulating, with minimum energy loss and synchronously with the interrogator signal, the energy exchange process between the transponder coupling element and a complementary storage element, and further varying, also with minimum energy loss and synchronously with the resultant oscillation waveform, the said energy exchange process so that the reply carrier becomes modulated with an information bearing code, the modulation rate being not constrained by the transponder tuned circuit bandwidth.
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