Electronic identification system
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United States of America Patent
Stats
-
Apr 7, 1992
Grant Date -
N/A
app pub date -
Jun 30, 1988
filing date -
Jul 3, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic identification system comprises at least one transmitter capable of generating an interrogation field in an interrogation zone and a plurality of responders capable of generating a pre-determined coded signal in response to an interrogation field. The signal can be detected by at least one receiver. According to the invention, the at least one responder has a receiver circuit adapted to be brought into a first mode in which the receiver circuit forms a tuned narrow-banded circuit and into a second mode in which the receiver circuit forms a broad-banded circuit.
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