Deactivateable resonant circuit

Details Deactivateable resonant circuit Deactivateable resonant circuit

1997-09-22

1999-01-19

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

295921, 29623, 29843, 336200, 336232, 343895, 361767, G08B 13187, H05K 332

Patent

active

058618090

ABSTRACT:
A resonant tag used with an electronic article surveillance system for detecting the presence of the tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range includes a resonant circuit capable of resonating at a frequency within the predetermined detection frequency range. The resonant circuit includes an inductor formed at least in part on a surface of a dielectric substrate of the tag. The inductor is formed with a discontinuity or gap, causing an electrical open circuit. The open circuit is closed with a fuse secured proximate to the gap and wirebonded to the portions of the inductor proximate to the gap. The fuse is melted by a current greater than a predetermined level flowing therethrough. Such a high current may be induced in the inductor by an external electromagnetic field. Melting of the fuse causes an open circuit condition, which alters the frequency at which the tag resonates.

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patent: 5276431 (1994-01-01), Piccoli et al.
patent: 5708419 (1998-01-01), Isaacson et al.

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