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Khaje Nasiri, Eiman | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41623 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotovat Ahmadi, Ali
  7. Abstract:
  8. RFID systems are available in various applications for indoor and outdoor positioning. Location awareness in public environment and in stores and companies are widely in use. In indoor environment , multipath and fading changes signals specification, so it is difficult to detect the related parameters. In the other hand the necessity of fast and reliable system which support traffic and a large number of users are in demand. RFID which is based on radio frequency signals is developed for this aim.RFID system with asymmetrical link which support UWB and Narrowband signals is suggested for indoor positioning application. RFID passive tag in this system is redesigned in his thesis. Communication link from reader to tag is Narrowband signal to power it up. Passive tag responses to reader by Ultra wide band signal which its immunity to multipath makes positioning more accurate. In this thesis we redesigned all analog and digital blocks of system and simulated them with ADS software. Moreover, rectifier circuit as the main part in tag which provide DC voltage for other blocks is studied. Several techniques for tag’s sensitivity increment are presented . Impedance matching for rectifier as nonlinear circuit is investigated. Two different rectifier are presented and test circuits for the proposed rectifiers are fabricated with TSMC 0.18um CMOS technology, and their sensitivity are compared.Finally, a discrete UWB transceiver is fabricated on PCB and added to a commercial RFID system to increase security and bit rate of an available system. The proposed system is certified.


  9. Keywords:
  10. Radio Frequency Identification (RFID) ; Label ; Rectifiers ; Ultra Wideband ; Impedance Matching ; Indoor Positioning

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