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Design and Realization of a Microstrip Antenna Array for Both Automotive Radar Application and 5G Communications at 78/28 GHZ Band

Ayatollahi, Hamed | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54896 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Farzaneh, Forouhar
  7. Abstract:
  8. With the advancement of automotive technology, the use of automotive radar for collision avoidance and pedestrian detection has been increasingly become universal. In this thesis, our goal is to design a dual-band radar antenna for obstacle detection and a 5G omnidirectional antenna for communication purposes in self-driving cars. We will first introduce the automotive radar and its operation. Next, the FMCW radar, which is simultaneously effective for speed, distance and direction estimation is introduced. Then we introduce the leaky wave antenna as the frequency scanning antenna. This is realized in an SIW waveguide technology. The main issue in this part is the achievement of high bandwidth with the presence of a scanning beam at a wide-angle and the presence of a low level of the side-lobe.For the communication purposes with central stations and other vehicles and information gathering about the surrounding in automotive communication systems, an omnidirectional antenna is required, for this purpose, a full-fledged antenna complements itself to achieve high bandwidth and response characteristics. The 28 GHz band is used for 5G communication network application. Between the transceiver and the antennas, a diplexer is needed for the dual purpose of radar and communications. The diplexer is designed to cover two frequency bands of 10 to 40 GHz and 72 to 82 GHz. The required low-pass filter is designed in stripline technology and the high-pass as a SIW technology. An array of 8 linear arrays is used instead of a linear array of leaky wave antenna to achieve high gain. Consequently, a 1 to 8 divider has been designed to connect the single output of the filter to the array. In order to use the array antenna, the divider outputs must be both amplitude matched and phase matched, in order to achieve this goal, the idea of changing the width of the waveguides has been implemented.
  9. Keywords:
  10. Frequency Scanning Antenna ; Frequency Diplexer ; Frequency Modulated Continuous Wave (FMCW) ; Leaky Wave Antenna ; 78GHz Automotive Radar ; Self-Driving Car

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