Activate/deactiveable security tag with enhanced electronic protection for use with an electronic security system

US6400271B1 · kind B1 · utility

Assignee

• CHECKPOINT SYSTEMS, INC. · US

Inventors

• John Edwin Davies, Jr. · Sewell, US
• Lawrence Appalucci · Villanova, US
• Alan P. Dutcher · Bensalem, US
• Gary Mazoki · Sewell, US
• Anthony F. Piccoli · Audubon, US

Key dates

• Filing date: Mar 20, 2000
• Grant date: Jun 4, 2002
• Expiry date: Mar 20, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G08B13/2437
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A security tag for use with an electronic security system which functions within a second frequency range comprises a substantially planar dielectric substrate having first and second sides. A first conductive pattern is provided on the first side of the substrate, the first conductive pattern comprising at least a first inductive element, a first plate of a first capacitive element and a first plate of a second capacitive element. A second conductive pattern located on the second side of the substrate comprises at least a second inductive element, a second plate of the first capacitive element and a second plate of a second capacitive element with the plates of the capacitive elements being generally aligned. The inductive elements and the capacitive elements form a resonant circuit which resonates at a first frequency within a first frequency range which is outside of the second frequency range. A direct electrical connection extends through the substrate to electrically connect the first conductive pattern to the second conductive pattern to thereby continuously maintain both sides of the substrate at substantially same static charge level.