Design of Null-Filling Antenna for Automotive Radar Using the Genetic Algorithm

A null-filling antenna for automotive radar is investigated using the genetic algorithm. The single column of the proposed antenna consists of four gap-coupled antenna elements and 14 direct-coupled antenna elements. The radiating elements are inclined 45
$^{\circ}$
from the feedline. The proposed antenna has 19.67 dBi gain with a
${-}$
20.19-dB sidelobe level in the elevation and a
${-}$
25.08-dB sidelobe level in the azimuth direction. The blind zone is reduced from 19.03 to 2.38 m using the proposed antenna for sensing the obstacle. The proposed antenna is a good solution for both short- and long-range automotive radar.