Electronic proximity identification system with simplified low p

Details Electronic proximity identification system with simplified low p Electronic proximity identification system with simplified low p

1983-12-09

1986-04-01

Pitts, Harold I.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235488, G06K 500

Patent

active

045800413

ABSTRACT:
An identification system comprising a reader (10) including a first signal generator (12) for generating a first signal (F1) which is radiated by an antenna (17). An identifier (11) includes an antenna (20) receiving the first signal for transmission to a signal modulator (32) which operates to modulate the signal in accordance with a preassigned code for the identifier. The modulated signal is then used to periodically unload or change the reactance of the antenna (20) which action in turn changes the reactance of the reader antenna and consequent voltage on the reader antenna (17). By detecting the change in the voltage on the reader antenna the code of the identifier is determined. Power drain is minimized and power is used efficiently by unloading during modulation and by changing reactance without changing load.

REFERENCES:
patent: 4223830 (1980-09-01), Walton

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