Dual frequency EAS tag with deactivation coil

Details Dual frequency EAS tag with deactivation coil Dual frequency EAS tag with deactivation coil

1994-09-14

1996-05-14

Eldred, J. Woodrow

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Radar transponder only

340572, H03M 734

Patent

active

055171958

ABSTRACT:
A dual frequency microwave EAS tag includes a dual frequency antenna circuit formed on one side of a substrate. The antenna circuit includes a diode. A deactivation circuit is formed on the other side of the substrate. A conductive connection passes through a hole in the substrate and connects the deactivation circuit to the antenna circuit. The deactivation circuit responds to a low energy ac magnetic field by inducing a voltage in the diode of the antenna circuit so as to disable the diode, thereby deactivating the tag without requiring the tag to be placed in direct contact with a disabling device.

REFERENCES:
patent: 3631442 (1971-12-01), Fearon
patent: 4021705 (1977-05-01), Lichtblau
patent: 4063229 (1977-12-01), Welsh et al.
patent: 4318090 (1982-03-01), Narlow et al.
patent: 4567473 (1986-01-01), Lichtblau
patent: 4663625 (1987-05-01), Yewen
patent: 4736207 (1988-04-01), Siikarla et al.
patent: 4745401 (1988-05-01), Montean
patent: 5103210 (1992-04-01), Rode et al.
patent: 5257009 (1993-10-01), Narlow

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