Resonant tag

Details Resonant tag Resonant tag

1991-10-15

1992-06-02

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

G08B 1322

Patent

active

051190702

ABSTRACT:
A resonant tag carries a plurality of resonant circuits having different resonant frequencies. The resonant circuit is composed of a first conductive pattern formed by a conductive metal foil on one surface of an insulating thin film and a second conductive pattern formed by a conductive metal foil on the other surface of the insulating thin film. The first conductive pattern contains an inductor element and an element of the capacitor, which correspond to a resonant frequency of the resonant circuit. The second conductive pattern contains the other element of the capacitor element. The capacitor element of the second conductive pattern, which corresponds to the resonant frequency, is disposed at a position where it faces the capacitor element of the first conductive pattern formed on one surface of the insulating thin film. When the resonant tag is used, the conductive metal foils formed on the two surfaces of the insulating synthetic resin film are electrically connected so as to turn off part of the resonant circuits, so that the resonant tag can be identified by a combination of resonant frequencies inherent in the remaining resonant circuits. For example, n (two or more) resonant circuits having different resonant frequencies may be formed on a resonant tag so that the tag can be identified in 2.sup.n -1 (or 2.sup.n) different ways.

REFERENCES:
patent: 3720940 (1973-03-01), Fox et al.
patent: 3967161 (1976-06-01), Lichtblau
patent: 4021705 (1977-05-01), Lichtblau
patent: 4717438 (1988-01-01), Benge et al.
patent: 4727360 (1988-02-01), Ferguson et al.
patent: 4752680 (1988-06-01), Larsson

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