METHOD AND SYSTEM FOR STANDING WAVE DETECTION FOR RADIO FREQUENCY IDENTIFICATION MARKER READERS

摘要

A method and system for determining the absence and presence of items in an RFlD interrogation zone. At least one RFID reader transmits interrogation signals in an interrogation zone. Each RFID reader transmits interrogation signals having a forward amount of RF energy and receives response signals f rom the items in the interrogation zone having a reflected amount of RF ener gy. A detection circuit determines the presence and absence of items within the interrogation zone based at least in part on the reflected amount of RF energy.