EAS tag with helical coil

Details EAS tag with helical coil EAS tag with helical coil

1987-06-22

1988-09-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343894, 343895, G08B 1318

Patent

active

047745045

ABSTRACT:
An anti-theft tag for use in an electronic article surveillance system has a housing, a lock for releasably attaching the housing to an article to be protected, and a marker on the housing, the marker having a resonant circuit including an inductor and a capacitor, the inductor including a solenoid type winding defining a winding opening, wherein the circuit has a Performance Factor P of at least 1.times.10.sup.6 in the equation P=QA.sup.1.5, wherein Q is equal to the circuit Q, and wherein A is equal to the area of the winding opening in square millimeters.

REFERENCES:
patent: 3500373 (1970-03-01), Minasy
patent: 3911534 (1975-10-01), Martens et al.
patent: 3942829 (1976-03-01), Humble et al.
patent: 3973418 (1976-08-01), Close
patent: 4104622 (1978-08-01), Van Niel
patent: 4156302 (1979-05-01), Van Niel
patent: 4311992 (1982-01-01), De Chant
patent: 4339853 (1982-07-01), Lipschitz
patent: 4502717 (1985-05-01), Close

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