Electronic article surveillance system having low profile...

Details Electronic article surveillance system having low profile... Electronic article surveillance system having low profile...

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01)

Patent

CA 1233540

ABSTRACT OF THE DISCLOSURE An electronic article surveillance system for microwave frequencies (500 MHz and higher) has low profile (i.e., shallow) transmitter antenna arrays and a low profile receiver antenna array, each array comprising a pair of thin metal patches, spaced apart in the normal direction of travel through a surveillance zone, and a thin metal ground plane behind the patches. The patches and ground plane are in spaced parallel relationship. Each metal patch and the adjacent portion of the ground plane together form a cavity resonator which resonates at a desired transmitter or return signal frequency and thereby form a signal radiating or receiving structure. The patch size, patch to ground plane spacing, and spacing between patches are determined by the desired resonant frequency.

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