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  1. 1. RFID Antenna Design (2006) Dr. Xiuping Li Associate Professor Beijing University of Posts and Telecommunications Email: [email_address] Tel:010-62282900
  2. 2. Outline <ul><li>RFID Antenna Overview </li></ul><ul><ul><li>Academic publication </li></ul></ul><ul><ul><ul><li>Tag antenna structure </li></ul></ul></ul><ul><ul><ul><li>Environmental effects on RFID tag antenna </li></ul></ul></ul><ul><ul><li>Patents </li></ul></ul><ul><li>RFID Antenna Design in BUPT </li></ul><ul><ul><li>UHF&MW band tag antenna Design </li></ul></ul><ul><ul><li>ANN modeling in antenna design </li></ul></ul><ul><ul><li>Research on environmental effects </li></ul></ul><ul><ul><li>Multi-band reader antenna </li></ul></ul><ul><li>Conclusion </li></ul>
  3. 3. RFID Antenna Overview
  4. 4. <ul><li>RFID Tag Antenna </li></ul><ul><li>RFID Reader Antenna </li></ul><ul><li>Work frequency </li></ul><ul><ul><li>LF,HF </li></ul></ul><ul><ul><li>UHF,MW </li></ul></ul><ul><li>Antenna Types </li></ul><ul><ul><li>Wire Antennas </li></ul></ul><ul><ul><li>Aperture Antennas </li></ul></ul><ul><ul><li>Microstrip Antennas </li></ul></ul><ul><ul><li>Array Antennas </li></ul></ul><ul><ul><li>…… </li></ul></ul>Classification
  5. 5. RFID system operation
  6. 6. RFID Tag Antenna Design Process Select the application and define the requirement Determine the materials for antenna construction Determine RF impedance of packaged ASIC Identify the type of antenna and its parameters Perform parametric study and optimization Build and measure prototypes Yes No Design requirement met? Design Is ready
  7. 7. Requirement for RFID Tag Antenna <ul><li>Small enough </li></ul><ul><li>Direction </li></ul><ul><li>Must provide maximum possible signal to ASIC </li></ul><ul><li>Polarization </li></ul><ul><li>Be robust </li></ul><ul><li>Be very cheap </li></ul><ul><ul><li>Copper, aluminum, and silver ink </li></ul></ul><ul><ul><li>flexible polyester and rigid PCB substrates like FR4. </li></ul></ul>
  8. 8. Major Consideration <ul><li>The type of antenna </li></ul><ul><li>Its impedance </li></ul><ul><li>RF performance when applied to the object </li></ul><ul><li>RF performance when the object has other structures around it </li></ul><ul><li>P.Foster and R.Burberry, “Antenna problems in RFID systems” IEEE colloquium on RFID Technology, pp.3/1-3/5, 25 Oct 1999. </li></ul>
  9. 9. RFID Tag Antenna Design(1) <ul><li>Type improvement </li></ul><ul><li>Gain-optimized self-resonant meander line antennas for RFID applications </li></ul><ul><ul><li>Genetic algorithms </li></ul></ul><ul><ul><li>Best tradeoff between wire length minimization and best current utilization. </li></ul></ul><ul><ul><li>Self-resonant: simplify the matching network and obtain low-cost tags. </li></ul></ul>
  10. 10. RFID Tag Antenna Design(2) <ul><li>CPW-fed folded-slot antenna for 5.8 GHz RFID tags </li></ul>
  11. 11. RFID Tag Antenna Design(3) <ul><li>Planar inverted-F antenna for radio frequency identification </li></ul>
  12. 12. RFID Tag Antenna Design(4)
  13. 13. Environmental Effects <ul><li>Daniel M.Dobkin and Steven M.Weigand, “Environmental Effects on RFID Tag Antennas”, 2005 IEEE APS,pp.135-138. </li></ul><ul><li>Study on the influence of curving of tag antenna on performance of RFID </li></ul>
  14. 14. RFID Antenna Patents <ul><li>Annual increasing amount is 183.6 from 2001-2005, </li></ul><ul><ul><li>11.4 from 1991 to 1995, 39.4 from 1996 to 2000 </li></ul></ul><ul><li>More than 50% - US patents every year </li></ul><ul><li>The application amount from Jan 2006 to Aug 2006is around 88.3% of that in 2005 </li></ul>
  15. 15. Developing Trends
  16. 16. Region Distribution
  17. 17. Patents for RFID Tag Antenna <ul><li>Increase 300% from 2000 to 2005 </li></ul><ul><ul><li>Conductive transponder loop </li></ul></ul><ul><ul><li>Vehicle transponder tracking </li></ul></ul>
  18. 18. Developing Trends
  19. 19. Region Distribution RFID patents report: Ministry of information industry software and integrated circuit promotion center (CSIP)
  20. 20. RFID Antenna Design in BUPT
  21. 21. <ul><li>UHF&MW band Antenna Design </li></ul><ul><li>Research on Environmental Effects </li></ul><ul><li>ANN modeling in Antenna design </li></ul>
  22. 22. RFID Antenna Design Xiuping Li , Yu Liu, Haiying Cao,” Minimized Printed Dipole Antenna Design Based on RFID Application”, Journal of Beijing University of Posts and Telecommunications, 2006.10, Vol.29, No.5, 75-78.
  23. 25. Water in Glass bottle
  24. 26. Water in Plastic bottle
  25. 27. Metal Can Xiuping Li , Yu Liu,Printed Dipole Antenna Measurement Effect by Environment for RFID Application , Accepted by eletronics devices.
  26. 28. Inverted-F antenna design
  27. 29. UHF Antenna Design
  28. 30. Artificial Neural Network
  29. 32. ANN Modeled results EM Simulated results
  30. 33. ( L d = 21.4mm, W d =6mm, L b = 23mm) Xiuping Li, Jianjun Gao and Georg Boeck, Printed Dipole Antenna Design by Artificial Neural Network Modeling for RFID Application, International Journal of RF and Microwave Computer-Aided Engineering, Vol.16,No.6, 607-611. ANN Modeled results EM Simulated results
  31. 34. Conclusion <ul><li>Tag Antenna plays important role in RFID system </li></ul><ul><li>Research based on the RFID system application environment </li></ul><ul><li>Hot topic </li></ul><ul><li>Optimized and low cost antenna---Market requirement </li></ul>
  32. 35. Thanks !