Browsing by Author "YILMAZ, Selen"
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Item A STUDY ON MICROSTRIP ANTENNA DESIGN FOR 77 GHZ RADAR SYSTEMS(2023-01-20) YILMAZ, Selen; KARA, Ali; DALVEREN, YaserThis thesis presents a comprehensive investigation into the design and operational behavior of series-fed microstrip patch antenna array for the 77 GHz automotive radar. Initially, the theoretical background information on the theory of microstrip antenna, patch antenna array, frequency scanning array and Chebyshev array are provided. A full-wave finite element method-based simulation tool is used to design and slightly tune the dimensions of the antennas as a parametric study. At the first stage, a series fed linear Chebyshev patch array with resonance at 76.5 GHz is designed representing one transmit channel of the antenna. Shorting pins are loaded to transition structure of ground-signal-ground (GSG) padding to enhance the total gain. Comparative analysis between vialess and via loaded cases is conducted in terms of bandwidth and gain. At the last stage, 76.5 GHz linear patch antenna array is converted into a 79 GHz linear patch antenna array by optimizing the GSG padding dimensions, scaling the spacings between each two adjacent array elements and the length of array elements. Two designs are proposed to assess the effect of scaling method at this stage. Comparative analysis in terms of the beam steering angle, the impedance bandwidth, the overall gain and the sidelobe level suppression is conducted between these two designs. Keywords: Dolph-Chebyshev Distribution, Frequency Scanning Array, Linear Array, mmWave, Patch Array Antenna.