Patent ID: 8471683

Claim:
An object tracking system comprising: an RFID reader including a plurality of antenna ports; a first antenna associated with a first antenna port of the plurality of antenna ports, the first antenna oriented toward a first lane; a second antenna associated with the first antenna port and oriented toward a second lane; a third antenna associated with a second antenna port of the plurality of antenna ports, the third antenna oriented toward the first lane; and a fourth antenna associated with the second antenna port and oriented toward the second lane; wherein a first field associated with the first antenna overlaps a third field associated with the third antenna; wherein a second field associated with the second antenna overlaps a fourth field associated with the fourth antenna; and wherein the RFID reader is configured to cycle activation of the antennas so that the first and second fields are active at a first time and the third and fourth fields are active at a second time that differs from the first time.