Electronic identification system

Details Electronic identification system Electronic identification system

1988-06-30

1992-04-07

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 340572, H04Q 900, H04Q 700

Patent

active

051032228

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.

REFERENCES:
patent: 2589331 (1952-03-01), Broos
patent: 4196418 (1980-04-01), Kip et al.
patent: 4364043 (1982-12-01), Cole et al.
patent: 4473825 (1984-09-01), Walton
patent: 4631708 (1986-12-01), Wood et al.
patent: 4656463 (1987-04-01), Anders et al.
patent: 4786903 (1988-11-01), Grindahl et al.

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