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Analysis and Design of Antenna for Automotive Radar with Pencil Beam Based on Dirac Leaky-Wave Antennas

Mehri Pashaki, Mahyar | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55382 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Memarian, Mohammad
  7. Abstract:
  8. Expansion of communication and the emergence of new fields such as the Internet of Things, has led to the development of smart cars and especially self-driving cars. The antennas used in the radar of these cars are of special importance for a better understanding of the environment around the car. The important parameters for the design of antennae for automotive radar are: good resolution, narrow beam width, the ability to change the angle of the main beam, etc. Among the most common antennas used in these radars are directional antennas, for this reason phased array antennas and leaky wave antennas are suitable options for this application. In general, the complexity and difficulty in the design and implementation of the feeding network of phased arrays leads us to seek other options, such as leaky wave antenna. In this research, we design a two-dimensional Dirac leaky wave antenna with the ability to radiate in the direction perpendicular to the antenna (Broadside) and create a pencil beam in this direction, which uses a very simple point feed to excite the antenna. For this purpose, we first introduce a two-dimensional cell that has the ability to close the stop band at broadside, for maximal aperture efficiency. This cell is inspired from Dirac photonic crystals which do not have a stopband in the gamma point, thus making it possible to obtain proper radiation in the direction perpendicular to the antenna without loss of gain. A circuit model is also presented that can correctly model the behavior of the cell, and this model can be used to design the cell at different frequencies
  9. Keywords:
  10. Dirac Leaky Wave Antenna ; Millimeter Wave ; Continuous Beam Steering ; Automotive Radar ; Dirac Two Dimentional Cell

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