LC RESONANT CIRCUIT WITH AMPLIFICATION DEVICE

WIPO Patent Application WO2004100366

A3

A security tag includes a combination of a resonant frequency circuit (10) with an adjacent amplification shield (12) for enhancing output signal amplitude. The amplification shield is located adjacent to the resonant frequency circuit and is preferably in the same or substantially the same plane as the resonant frequency circuit or is in a close, generally parallel plane. In an exemplary embodiment, the resonant frequency circuit includes an inductor electrically coupled to a capacitor. The resonant frequency circuit has a center frequency and is arranged to resonate in response to exposure to electromagnetic energy at or near the center frequency, providing an output signal having an amplitude. The amplification shield is arranged to direct a portion of the electromagnetic energy to the resonant frequency circuit to amplify the amplitude of the output signal from the resonant frequency circuit.

PICCOLI ANTHONY F (US)
APPALUCCI LAWRENCE (US)
PEREZ DAVID LOPEZ
SOLER-BONNIN LUIS FRANCISCO
MAZOKI GARY (US)

PCT/US2004/013209

June 09, 2005

April 30, 2004

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CHECKPOINT SYSTEMS INC (US)
PICCOLI ANTHONY F (US)
APPALUCCI LAWRENCE (US)
PEREZ DAVID LOPEZ
SOLER-BONNIN LUIS FRANCISCO
MAZOKI GARY (US)

G06K19/077; G08B13/24; H01Q1/22; H01Q7/00; H01Q23/00; H03H7/00; (IPC1-7): H03H7/00; G08B13/24; H01Q7/00

EP0794520A1	1997-09-10
EP1347533A1	2003-09-24
US6320509B1	2001-11-20
US4021705A	1977-05-03

PATENT ABSTRACTS OF JAPAN vol. 1998, no. 10 31 August 1998 (1998-08-31)
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05)

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