ELECTRONIC ARTICLE SURVEILLANCE SYSTEM

摘要

An EAS system capable of reliable operation at high frequencies such as abou t 8 MHz, has an arrangement of transmitter and receiver antennas (20, 18) each lying in a flat, horizontal plane in substantial alignment, with the receive r antenna (18) positioned at the floor of a passageway and the transmitter antenna (20) positioned overhead. Each antenna takes the form of a pair of parallel-connected, coplanar loops (36, 40), with the transmitter antenna loops (36) having current flowing in the same direction while the receiver antenna loops (40) having current flowing in opposing directions.