EP 0135049 A1 19850327 - Electronic article surveillance system.
Title (en)
Electronic article surveillance system.
Title (de)
Elektronisches Warenüberwachungssystem.
Title (fr)
Système électronique de surveillance d'objets.
Publication
Application
Priority
US 51939583 A 19830801
Abstract (en)
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, path to ground plane spacing, and spacing between patches are determined by the desired resonant frequency.
IPC 1-7
IPC 8 full level
G01S 7/02 (2006.01); G01S 13/04 (2006.01); G08B 13/24 (2006.01)
CPC (source: EP)
G08B 13/2422 (2013.01); G08B 13/2471 (2013.01); G08B 13/2474 (2013.01)
Citation (search report)
- [YD] US 3895368 A 19750715 - GORDON LLOYD L, et al
- [Y] US 3680136 A 19720725 - COLLINGS RUPERT H
- [A] US 4386357 A 19830531 - PATTON PAUL D
- [AD] US 4063229 A 19771213 - WELSH JOHN, et al
- [AD] US 4366484 A 19821228 - WEISS MICHAEL A, et al
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0135049 A1 19850327; EP 0135049 B1 19880608; AR 241390 A1 19920630; AT E35063 T1 19880615; AU 3121984 A 19850207; AU 573749 B2 19880623; BR 8403774 A 19850702; CA 1233540 A 19880301; DE 3472019 D1 19880714; JP S60100071 A 19850603; NZ 209068 A 19880330
DOCDB simple family (application)
EP 84108629 A 19840720; AR 29742484 A 19840801; AT 84108629 T 19840720; AU 3121984 A 19840727; BR 8403774 A 19840730; CA 459813 A 19840726; DE 3472019 T 19840720; JP 16150584 A 19840731; NZ 20906884 A 19840731