ID card using surface acoustic waves

Details ID card using surface acoustic waves ID card using surface acoustic waves

1990-08-16

1992-07-14

Levy, Stuart S.

Registers

Records

Conductive

235439, G06K 700, G06K 1906

Patent

active

051305224

ABSTRACT:
An ID card includes an electric wave receiver for receiving an electric wave from a main station, a modulator for modulating a received signal in accordance with an ID number, and an electric wave transmitter for transmitting a modulated electric wave signal to the main station. The main station identifies the ID card on the basis of the modulated electric wave signal. The ID card further includes a surface acoustic wave exciting device for coupling the electric wave receiver and the electric wave transmitter through surface acoustic wave on a piezoelectric substrate by means of the modulator and a circuit including a terminating device and a switching element and connected in parallel with the surface acoustic wave exciting device. The switching element is controlled to be turned on and off in accordance with the ID number to control the coupling between the electric wave receiver and the electric wave transmitter.

REFERENCES:
patent: 3706094 (1972-12-01), Cole et al.
patent: 4658252 (1987-04-01), Rowe
patent: 4980680 (1990-12-01), Knoll et al.

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