
68 RFID and Auto-ID in Planning and Logistics
the reader can only activate the interrogation zone on an intermittent basis. The downside to this
approach is that all of the material can be monitored, but only at specic intervals. Between inter-
rogation intervals, the presence or location of the tagged material is unknown.
5.4 ANTENNAS
As previously discussed, an RFID antenna is used to transmit the RF signal from ...