Resonant label detection system for antitheft equipment has receivers that are activated before and after series of pulses is generated to detect signal emitted by resonant circuits

摘要

Antennas are placed in an electromagnetic signal area to generate a series of pulses. The pulses cause the resonant circuits that are fixed to articles to be protected to resonate for a specific period after the series of pulses ceases. Receivers detect the signal emitted by the resonant circuits. The receivers are activated before and after the series of pulses is generated.