Proximity identification system with power aided identifier

Details Proximity identification system with power aided identifier Proximity identification system with power aided identifier

1985-01-23

1987-04-07

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082554, 34082572, 342 44, G07D 700, H04Q 700

Patent

active

046564721

ABSTRACT:
An electronic identification and recognition system which has a battery powered identifier. The reader section radiates stimulus to the identifier section. A battery is switched on and power a clock and memory which in turn vary the reactance of the identifier antenna circuit. The change in reactance affects the phase angle of the voltage within the reader antenna. The phase angle changes are detected and recorded by the reader section such that the internal code of the identifier section is determined.

REFERENCES:
patent: 2927321 (1960-03-01), Harris
patent: 3299424 (1967-06-01), Vinding
patent: 3806905 (1974-04-01), Strenglein
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 4209783 (1980-06-01), Ohyama et al.
patent: 4291266 (1981-09-01), Portmann
patent: 4333072 (1982-06-01), Beigel
patent: 4388524 (1983-06-01), Walton
patent: 4517563 (1985-05-01), Diamant

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