Deactivatable resonant marker for use in RF electronic article s

Details Deactivatable resonant marker for use in RF electronic article s Deactivatable resonant marker for use in RF electronic article s

1985-03-15

1987-08-25

Wise, Robert E.

Communications: radio wave antennas

Antennas

Spiral or helical type

H01Q 136

Patent

active

046896368

ABSTRACT:
A deactivatable marker for use in an RF electronic article surveillance system is disclosed, which marker includes a resonant circuit having at least one inductive component and one capacitive component. The circuit further comprises a component having two conductive layers separated only by an insulative thin-film which breaks down when at least a predetermined potential is applied across it to form a conductive path which changes the resonant frequency of the circuit. The two conductive layers are preferably configured to form a spiral multi-turn inductor and capacitor pads on opposing surfaces of a dielectric sheet, and to be embossed at a localized area, thereby contacting the layers except for the presence of the insulating thin-film.

REFERENCES:
patent: 3810147 (1974-05-01), Lichtblau
patent: 4021705 (1977-05-01), Lichtblau
patent: 4498076 (1985-02-01), Lichtblau

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