Microwave Frequency RFID
Microwave RFID is well into its second decade of applications based primarily upon active tag technology, with factory automation, access control and logistics being the principal areas of use. 2.45 GHz technology was introduced for road-tolling but superseded by 5.8 GHz technology once a ‘road-pricing band’ was specifically allocated for 5.8 GHz centered systems. In more recent years lower-cost passive, beam-powered, systems have been introduced that offer shorter range attributes than those provided by active devices. The attraction of microwave RFID is essentially influenced by the prospect of good range under appropriate conditions and fast data transfer rates.