G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 13/22 (2006.01) G08B 13/24 (2006.01)
Patent
CA 2041616
A system for use in detecting the presence of an electronic article surveillance tag in an area subject to surveillance comprises first and second antenna units disposed on opposed sides of the area, each of the antenna units incorporating therein at least first and second antennas circumscribing a common center thereof at respective different distances from the common center. Excitation circuitry is provided for exciting each first antenna at a greater level than each second antenna, the excitation of the first and second antennas by the exciting circuitry being of respective opposite phasing. The system further comprises a receiver connected to the first and second antenna units and alarm circuitry connected to the receiver to provide output indication of the presence of the tag in the area subject to surveillance.
Copeland Richard L.
Kopp Markus B.
Sensormatic Electronics Corporation
Smart & Biggar
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