RFID (Radio Frequency Identification)

  • Uses electromagnetic fields to store data on a small chip (RFID tag)
    • Includes antenna to send/receive
    • May include a battery
  • Tag and reader combinations come in three general types
    • ARPT (Active Reader Passive Tag)
      • When prompted, passive tag pulls power from active reader's radio waves to power transmission
      • Only work within a few centimeters of reader
    • PRAT (Passive Reader Active Tag)
      • Batter-powered tag actively transmits credentials at regular intervals
      • Don't require such close proximity
        • Most sophisticated devices can work up to 200m away
    • ARAT (Active Reader Active Tag)
      • Active reader interacts with batter-powered tag
  • Commonly used for inventory management

NFC (Near-Field Communication)

  • Fixed frequency of 13.56 MHz
  • Transfers data wirelessly over very short distances
  • Collects power from devices using magnetic induction
  • Inexpensive and can be purchased blank
    • Ready to be loaded

Wireless Networking Networking Computer Science