TAILIEUCHUNG - RFID Overview

First Bar code patents –1930s. First use of RFID device –2nd world war –Brittan used RFID-like technology for Identify-Friend or Foe Harry Stockman October 1948 Paper –Communication by means of reflected power ( The proceedings of the Institute of Radio Engineers). First RFID Patent -1973. Auto-ID center founded at MIT –1999. –Standardization effort taken over by EPC Global (Electronic Product Code). Current thrust primarily driven by Wal-Mart and DoD. –Automate Distribution: Reduce cost (man power, shipping mistakes). Increase sales (keep shelves full). DoD Total Asset Visibility InitiativeSource of. | 3 21 2013 RFID Overview Greg Leeming Intel Corporation 11 8 2004 eSSiisendkbitslOfdeaw e ncy I Dentifirat it is triggered by a reader Power source not required for passive tags. a defining benefit Superior capabilities to -barcode ----------- - Non - Hi-speed multiple reads - Can Line of Sight read and w rite to tags - Unit sp fClD FewcriT Traffic Toll Supply Chain Building Access Few cm Four main frequencies 1 3 21 2013 Presentation Objectives Explain technical principles behind RFID Provide overview of RFID technology Discuss - Forces driving the adoption of RFID - Challenges RFID deployment must overcome - The future Agenda RFID history Technical principles Tag overview Reader overview Adoption challenges The UHF market The future 2 3 21 2013 RFID History First Bar code patents - 1930s First use of RFID device - 2nd world war - Brittan used RFID-like technology for Identify- Friend or Foe Harry Stockman October 1948 Paper - Communication by means of reflected power The proceedings of the Institute of Radio Engineers First RFID Patent - 1973 Auto-ID center founded at MIT - 1999 - Standardization effort taken over by EPC Global Electronic Product Code Current thrust primarily driven by Wal-Mart and DoD - Automate Distribution Reduce cost man power shipping mistakes Increase sales keep shelves full DoD Total Asset Visibility Initiative Source of data EDN - October 2004 - Reading Between the Lines Brian Dipert Near field LF HF inductive coupling of tag to magnetic field circulating around antenna like a transformer Varying magnetic flux induces current in tag. Modulate tag load to communicate with reader field energy decreases proportionally to 1 R3 to first order Far field UHF microwave backscatter. Modulate back scatter by changing antenna impedance Field energy decreases proportionally to 1 R Boundry between near and far field R wavelength 2 pi so once have reached far field lower frequencies will have lost significantly more energy than high .

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