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R F I D

R F I D. Presented by Kerry Wong. What is RFID? . R adio F requency ID entification Analogous to electronic barcode Uses radio waves to send info Serial numbers for identifying product Allows automatic collection of data Keep track of large number of movable items

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R F I D

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  1. R F I D Presented by Kerry Wong

  2. What is RFID? • Radio Frequency IDentification • Analogous to electronic barcode • Uses radio waves to send info • Serial numbers for identifying product • Allows automatic collection of data • Keep track of large number of movable items • Can send info to computer for storage

  3. Components: Reader • Transmitter • carrier frequency generator, gap signal gate, and an antenna circuit • Constantly sends out radio signal ~ one carrier frequency • Receiver • peak detector, a signal amplifier/filter, signal-collision detector, and microcontroller • Uses envelop detector of received AM modulated signal to get the FSK ‘0’ or ‘1’ • Half Wave Rectifier

  4. Components: Tag • Transponder • Microchip (silicon chip) with LC antenna • Passive Tags ~ Smart Labels • Induced Current from receiver • Active Tags • Needs battery • Reflects back or transmit signal • Amplitude Modulates Carrier Frequency • Uses FSK for ‘1’ or ‘0’ • Ie: ‘1’ = fc/10 ‘0’=fc/8

  5. Advantages • Don’t need line of sight • Allows movement • Variety of Ranges • 10-20 feet (passive); 100-1000 feet (active) • Can have several • Bi-directional • Tag data content can be altered • Stores about 2Kbytes of data

  6. Disadvantages • Can’t use around metal and liquids • Reader Collision • One tag read twice • for overlapped readers • Tag Collision • Sol’n: Uses type of TDMA • Gap pulse begins random countdown

  7. Anti-Collision Protocol

  8. Applications • Car Identification • Animal Tagging • Pets and livestock • Airport Baggage Tracking • Product Tracking • Wireless payment systems • Building access cards

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