A beam expanding radome for 76.5 GHz automotive radar antennas is presented whose inner surface is engraved with corrugations.\nThe radar used for blind spot detection (BSD) requires a very wide beam width to ensure longer time for tracking out-of-sight\nobjects. It is found that the corrugations modulate the phase velocities of the waves along the surface, which increases beam\nwidth in the far field. In addition, defects in the corrugation increase beam width even further. The presented structure satisfies\nthe beam width requirement while keeping a low profile.
Loading....