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Design and Implementation of C band Vector- Sum phase Shifter for WLAN Applications

Janforooz, Mohammad Mahdi | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52985 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Akbari, Mohmoud; Fakharzadeh Jahromi, Mohammad
  7. Abstract:
  8. On the demand of higher directivity, higher throughput and less interference, phased array systems and MIMO have become attractive to reach these goals. The advantages of phased array systems include the ability to perform electronic beam steering and arbitrary pattern synthesis. Phase shifters and variable gain amplifiers are used to reach these advantages. In this thesis, a ‘’ C‘’ band (4.8 GHz-6.2 GHz) vector-sum phase shifter using HMIC technology for realizing a phased array receiver is designed. This phase shifter can change the signal phase and amplitude. The main blocks of this phase shifter are low-insertion phase and low-noise variable gain amplifier, which consists of current steering and current reuse topology with techniques for compensation of insertion phase, quadrature hybrid (branch line coupler) and Wilkinson power divider (combiner). Design specifications for variable gain amplifier are: low¬-insertion phase (below 13º), low-noise figure (below 4.9dB), and high dynamic range (about 24dB).The designed circuit has maximum gain about 25dB and insertion phase bellow 10º. All of the passive sections are designed with a microstrip transmission line on RO4003 for low insertion loss. ADS momentum planar EM simulator and CST studio are used to design and validate the schematic simulation results. The results of the signal constellation have 1024 different points and its RMS phase and gain error are 0.85º and 0.02 respectively. To show the designed phase shifter’s ability in pattern synthesizing, two uniform and Chebyshev patterns are plotted
  9. Keywords:
  10. Phased Array ; Low Noise Amplifier (LNA) ; Vector Sum ; Variable Gain Amplifier ; Vector Sum Phase Shifter ; Enterprise Wireless Local Area Networks (WLANs)

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