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International Journal of Antennas and Propagation
Volume 2017 (2017), Article ID 7316282, 12 pages
https://doi.org/10.1155/2017/7316282
Research Article

Beam Expansion of Blind Spot Detection Radar Antennas Using a Radome with Defected Corrugated Inner Wall

1Department of Electronic Engineering, Sogang University, 1 Sinsu-dong, Mapo-gu, Seoul, Republic of Korea
2Applied Network Team, LG Innotek Co., Ltd., R&D Center 1271, Sa-3-dong, Sangrok-gu, Ansan-si, Gyeonggi-do, Republic of Korea

Correspondence should be addressed to Haengseon Lee; rk.ca.gnagos@59sheel

Received 31 May 2017; Accepted 11 September 2017; Published 10 December 2017

Academic Editor: N. Nasimuddin

Copyright © 2017 Hayeon Kim et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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