Identification system and method with passive tag

Details Identification system and method with passive tag Identification system and method with passive tag

1993-06-24

1996-02-13

Swarthout, Brent A.

Communications: electrical

Condition responsive indicating system

Specific condition

34082554, 34087031, 435 91, G08B 2100

Patent

active

054914680

ABSTRACT:
An identification system with a reading device having a single turn transmission coil for continuously radiating alternating energy. A portable tag receives via a magnetic coupling, the energy from the reader and charges a storage capacitor to 5 volts. The capacitor is discharged rapidly during a time period less than the charging time period. This discharge of the capacitor powers a coded information transmission circuit during a small percentage of the duty cycle.

REFERENCES:
patent: 5019815 (1991-05-01), Cemelson
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5099226 (1992-03-01), Andrews
patent: 5105190 (1992-04-01), Kip
patent: 5124699 (1992-06-01), Tervoert
patent: 5218343 (1993-06-01), Stobbe
patent: 5235326 (1993-08-01), Beigel
patent: 5266926 (1993-11-01), Beigel
patent: 5353011 (1994-10-01), Wheeler

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