METHOD TO DRIVE AN ANTENNA COIL MAINTAINING LIMITED POWER SOURCE OUTPUT

摘要

Electronic article surveillance system includes an antenna system comprised of two or more of resonant circuits. Each resonant circuit includes an exciter coil having at least one wire turn aligned on a common coil axis. A transmitter is coupled to the antenna system and is arranged to generate an antenna system composite exciter signal. The composite exciter signal is comprised of a plurality of co-exciter signals having the same predetermined frequency. The composite exciter signal is capable of exciting an EAS security tag when applied to the antenna system. The transmitter has two or more transmitter output ports, each independently coupled to one of the plurality of resonant circuits. Each of the plurality of co- exciter signals is respectively provided separately from a transmitter output port to one of the of resonant circuits.