RFID is a form of automatic identification and data capture (AIDC) technology that uses electric or magnetic fields at radio frequencies for identification, authentication, location, or automatic data acquisition and transmit, and support a wide range of applications everything from asset management and tracking to access control and automated payment.
RFID wirelessly exchanges information between a tagged object and a reader/writer. An RFID system is comprised of the following components (Figure 1):
- One or more tags (also called transponders), which includes a semiconductor chip and antenna.
- One or more read/write devices (also called interrogators, or simply, readers).
- Two or more antennas, one on the tag and one on each read/write device.
- Application software and a host computer system.