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Design and Implementation of a Front-End For an Integrated UHF-RFID Reader with Tags Direction Finding Ability

Hakamizadeh Ghahremani, Ali | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43162 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Sharif Bakhtiar, Mehrdad
  7. Abstract:
  8. Radio Frequency Identification (RFID) is a fast developing research area in the pool of analog RF circuit design. Its applications are growing rapidly, in very different sectors ranging from supply chain management to airport baggage handling or traffic management for non-stop toll collection, etc. RFID surpasses the conventional bar code system in so many fields such as, long read range, multiple tag identification, contactless, re-programmability of tags and no need for a line-of-sight.
    Inthis projecta new approach for modeling and reducing the Multi Path Fading (MPF) error is proposed. It isbased on Direction of Arrival (DOA) technique in thepositioningofpassivetags in UHFRFID technology. The phasedifference of the signals which are received bytwoantennas (Phase difference of arrival (PDA)), in DOA technique, is calculatedasa function offrequencyin the presence ofMPF. It is shown that with the aid of a modification in the antennas configuration the MPF error can be suppressed. Besides, for more reduction in MPF error, average of multiple results at different frequencies is calculated. Furthermore, antennas spacing and its effects on the accuracy of the PDA and the positioning of the tags are inspected.
    This Project also deals with the front-end of an Integrated RFID Reader for the UHF band. The bottleneck of the design is the presence of a large interferer just hundreds of kilohertz apart from the desired signal which is at about 900 MHz. The key idea of the design is utilizing feedback in order to cancel out the interferer.
    The design has been taped out in 0.18 μm CMOS and the measured characteristics has proved the proposed functionality
  9. Keywords:
  10. Interferer ; Location ; Interferer Rejection ; Low Noise Amplifier (LNA) ; Mixer ; Radio Frequency Identification (RFID) Reader ; Radio Frequency Identification (RFID) ; Label ; Common Mode Rejection Ratio (CMRR) ; Radio Frequency Receiver

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