A security 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 dielectric substrate having first and second opposing principle surfaces, a peripheral outer edge, and a resonant circuit capable of resonating at a frequency within the predetermined detection frequency range. The security tag also includes a guard member, in one embodiment a discontinuous conductive member, effectively electrically isolated from the resonant circuit, extending along at least a portion of the peripheral outer edge of the substrate for surrounding at least a portion of the resonant circuit. The guard member electrically isolates the resonant circuit to facilitate testing of the resonant circuit during an early stage of the manufacturing process when the resonant circuit is in web form.

Etiquette de securite et sa methode de fabrication
Security tag and manufacturing method
Publication Number
Application Date
March 4, 1997
Publication Date
March 30, 2004
Appalucci Lawrence
Rankin Mark James
Piccoli Anthony Frank
Peirce Roger Jay
Mazoki Gary Thomas
Bonnin Luis Francisco Soler
Checkpoint Systems
Checkpoint Systems
G08B 13/24
G01V 15/00
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