Identification system

Details Identification system Identification system

1989-12-22

1991-07-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

455 83, G08B 1314, H04B 144

Patent

active

050363085

ABSTRACT:
An identification system for wireless electronic identification and data transmission, comprises a reading unit and at least one electronic label including a resonant circuit and carrying data stored in a memory device of the label, which data can be read wirelessly when the label is introduced into a high-frequency interrogation field formed by a transmitter of the reading unit. The reading unit includes a control device which, in operation, periodically switches the interrogation field on and off and in the time intervals when the field is switched off switches on a receiver capable of detecting a signal transmitted by a label. The at least one label includes a modulator which in the time intervals when the field is switched off can modulate the quality factor Q of the resonant circuit in dependence on the data stored in the memory device.

REFERENCES:
patent: 3740742 (1973-06-01), Thompson et al.
patent: 3810172 (1974-05-01), Burpee et al.
patent: 4023167 (1977-05-01), Wahlstrom
patent: 4476459 (1984-10-01), Cooper et al.
patent: 4531117 (1985-07-01), Nourse et al.
patent: 4667185 (1987-05-01), Nourse et al.
patent: 4797659 (1989-01-01), Larsen
patent: 4857093 (1989-08-01), Carroll

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