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Optimized Design of Switch Circuit and Receiver Antenna in the Field of Fifth Generation Telecommunications to Reduce the Fading Effect

Bakhshi, Mehran | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54551 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Akbari, Mahmood
  7. Abstract:
  8. The Deep Fading Effect is a destructive factor in communication systems, one of the solutions to eliminate it is the use of Diversity, and there are two types of indicators of Diversity, Spatial Diversity and Polarization Diversity. Spatial Diversity is a common method to reduce the Fading Effect while increasing the cost and increasing the volume of the communication station, which to optimize the cost and reduce the volume of the communication station, the Polarization Diversity Structure is added to the telecommunication system. To apply Spatial Diversity, several Antennas with different Polarizations are used, which The most common method in mobile telecommunication station systems is the use of two Antennas with perpendicular linear polarization. The Spatial Diversity System is divided into two parts, the Controller and the Antenna. In the Controller part, a Switch with multiple inputs and one output (SPNT) can be selected between the received signals, which N is determined based on the number of Antennas. The purpose of this project, based on the most common case, is to apply a Spatial Diversity Structure in the Fifth Generation Domain on a telecommunication system, so the design of two parts of the SPDT Switch Circuit and two Antennas with perpendicular polarization will be designed. The SPDT Switch Circuit consists of two main and subsidiary parts, the main part of the Switch Structure consists of a Diode connection that has been selected based on the specified goals, and the subsidiary part includes DC-Blocker and AC-Sweep, which are designed based on Microstrip circuits. In the design of the Printed Antenna by adding slots to the Patch Antenna Structure based on the Sensitivity method, several resonant frequencies have been added to the frequency bandwidth of the Structure to increase the frequency bandwidth and then the results have been improved by Arranging the structure and Finally, by Symmetrizing the designed Antenna, it is possible to provide two Antennas with linear polarization in the Direction of +45 and -45 with the same Beamwidth. In the construction stage of the Switch Circuit and Antenna Circuit, to minimize the manufacturing cost, CNC laser technology was used on Aluminum and Plexiglas Sheets to extract two-dimensional designs and Finally, by connecting them, a frame can be made, while the use of CNC milling technology has been criticized due to its high cost and low accuracy. The results of the construction of the Switch Circuit and the Antenna Circuit are presented, by examining possible errors in the construction stage of each circuit, the measured results were evaluated
  9. Keywords:
  10. Bluring Effect ; Fifth Generation of Mobile Networks ; Single Pole Double Throw (SPDT)Switch ; Polarization Diversity ; Two Antennas with Vertical Linear Polarization ; Optimal Design

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