Electronic identification system

Details Electronic identification system Electronic identification system

1992-01-03

1996-07-16

Peng, John K.

Communications: electrical

Continuously variable indicating

With meter reading

3408255, 340505, G07C 900, G06K 708

Patent

active

055371051

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.

REFERENCES:
patent: 3981011 (1976-09-01), Bell, III
patent: 4614945 (1986-09-01), Brunius et al.
patent: 4631708 (1986-12-01), Wood et al.
patent: 4691202 (1987-09-01), Denne et al.
patent: 5150114 (1992-09-01), Johansson

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