FIELD: engineering of electronic theft prevention systems, which detect markers within control zone.
SUBSTANCE: system uses interaction between magnetic fields of multiple antenna elements, generated in such a way, that magnetic field of changing direction is formed within controlled area. Antenna elements are powered in different phases in accordance to phasing scheme, to form different directions of magnetic field. Also described is new receiving antenna for receiving instabilities, caused by magnetization reversal of marker within control zone. Receiving antenna has receiving coil, mounted at certain distance from transmitting coil, and compensating coil, positioned closer to transmitting coil. Also described is the method for system operation and use.
EFFECT: highly reliable detection of markers during their movement in any direction and along any trajectory through control zone.
3 cl, 8 dwg
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