A system and method for determining the position of a radio frequency identification (RFID) transponder with respect to a sensor. In one embodiment, the system comprises a plurality of stationary sensors located in an array within certain physical areas. Each sensor comprises a plurality of antenna coils...http://www.google.ca/patents/US6661335?utm_source=gb-gplus-sharePatent US6661335 - System and method for locating radio frequency identification tags
