A method for using multi-functional RFID tag assemblies, passive repeater systems and modular antenna systems. One embodiment comprises a method for communicating with an RFID tag by providing a passive loop modular antenna system, moving the RFID tag through a field related to the modular antenna system...http://www.google.com/patents/US6724308?utm_source=gb-gplus-sharePatent US6724308 - RFID tracking method and system
