G - Physics – 01 – N
Patent
G - Physics
01
N
340/124.3
G01N 27/72 (2006.01) G08B 13/24 (2006.01)
Patent
CA 1236542
ABSTRACT OF THE DISCLOSURE An electronic article surveillance system for microwave frequencies (500 MHz and higher) has microstrip antenna arrays each array comprising a dielectric substrate having a plurality of metal patches, spaced apart in the normal direction of travel through a surveillance zone, on one side and a metal ground plane on the other side. 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.
459814
Fancher Philip D.
Sensiper Samuel
Williams Harold B.
Ballantyne Donald G.
Ici Americas Inc.
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