LOAD ISOLATED ARTICLE SURVEILLANCE SYSTEM AND ANTENNA ASSEMBLY

摘要

An electronic theft detection system with a front cover (42) is disclosed with a transmitter antenna assembly (84) which includes a flat electrically conductive panel (56) positioned close to a transmitter loop antenna (84a, 84b) to preload it and isolate it from the loading effects of nearby metal objects. A receiver support panel (86) with receiver coils (88) is laid over the the transmitter coils. A receiver is arranged with a signal gate synchronized to the transmitter antenna energization to prevent detection of targets located on the opposite side of the panel (40, 56).