Device for identification by proximity

Details Device for identification by proximity Device for identification by proximity

1987-11-25

1990-01-09

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 235382, 2353825, G06K 500, H04Q 702

Patent

active

048931187

ABSTRACT:
A reader identifies coded electronic badges without contact with the latter, by simple inductive coupling of inductances, the electrical supply of the badge being ensured from a voltage at high frequency F generated by the reader. The code of the badge, composed of a sequence of bits following one another at a frequency f very much less than F, is used to modulate a voltage of intermediate frequency fi comprised between f and F and the thus modulated voltage controls an electronic switch adapted to short-circuit a resonant circuit of the badge.

REFERENCES:
patent: 4546241 (1985-10-01), Walton
patent: 4654658 (1987-03-01), Walton
patent: 4656472 (1987-04-01), Walton
patent: 4665399 (1987-05-01), Fauser et al.
patent: 4724427 (1988-02-01), Carrol

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