Electronic identification system
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
Jan 3, 1992
filing date -
Jan 4, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An identification system comprises an interrogator and a number of transponders. The interrogator includes a transmitter for transmitting an interrogation signal to the transponder, and a receiver for receiving a response signal from the transponder. A micro-processor identifies the transponder from data in the response signal. Each transponder comprises a receiving antenna for receiving the interrogation signal, a code generator, a transmitting antenna, and a modulator connected to the code generator. On receipt of the interrogation signal the transponder repeatedly transmits a response signal containing data which identifies the transponder. The interrogator detects successful identification of any transponder and briefly interrupts the interrogation signal to indicate the successful identification. Each transponder includes a logic circuit responsive to a respective interruption in the interrogation signal to cease transmission of its own response signal.
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