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Introduction to RFID

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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.

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