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Rfid

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Radio Frequency Identification (RFID) technology

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Rfid

  1. 1. • RFID stands for Radio Frequency Identification. By means of radio signals, RFID can realize a contactless and unique identification of persons and products on a short range. • To do this, RFID utilizes so-called tags: electronic labels in which the unique information is saved digitally. This digital information can be read with a special reader unit. 3/3/2015 SHARIQUE MULLA 1
  2. 2. Passive RFID tags • Passive RFID is of interest because the tags don’t require batteries or maintenance. • These tags also have an indefinite operational life and are small enough to fit into a practical adhesive label. • A passive tag consists of three parts: an antenna, a semi conductor chip attached to the antenna, and some form of encapsulation. • The tag reader is responsible for powering and communicating with a tag. 3/3/2015 SHARIQUE MULLA 2
  3. 3. Active RFID Tags • Active tags require a power source—they’re either connected to a powered infrastructure or use energy stored in an integrated battery. • Batteries make the cost, size, and lifetime of active tags impractical for the retail trade. 3/3/2015 SHARIQUE MULLA 3
  4. 4. 3/3/2015 SHARIQUE MULLA 4
  5. 5. • Two fundamentally different RFID design approaches exist for transferring power from the reader to the tag: 1. magnetic induction 2. electromagnetic (EM) wave capture • These two designs take advantage of the EM properties associated with an RF antenna— the near field and the far field. • Both can transfer enough power to a remote tag to sustain its operation.3/3/2015 SHARIQUE MULLA 5
  6. 6. Near field RFID 3/3/2015 SHARIQUE MULLA 6
  7. 7. Far field RFID 3/3/2015 SHARIQUE MULLA 7
  8. 8. Advantages • No line of sight required • Long range identification feasible • Multiple tags can be detected (nearly) simultaneously • Operates in harsh environments • Memory to store data on object • Possibility to integrate sensors 3/3/2015 SHARIQUE MULLA 8
  9. 9. Application • Keyless entry • Electronic Product Code (EPC) • Proximity cards • Security device – Bookstores 3/3/2015 SHARIQUE MULLA 9
  10. 10. • Human implant ( human identification ) • Animal implant ( animal identification) 3/3/2015 SHARIQUE MULLA 10
  11. 11. References • K. Finkelzeller, The RFID Handbook, 2nd ed., John Wiley & Sons, 2003. • M. Weiser, “The Computer for the 21st Century,” Scientific Am., vol. 265, no. 3, 1991, pp. 94–104. • R. Want, “Enabling Ubiquitous Sensing with RFID,” Computer, vol. 37, no. 4, 2004, pp. 84– 86. 3/3/2015 SHARIQUE MULLA 11

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