1. [1] Ministry of Land, Infrastructure, Transport and Tourism, “Initiatives to ensure safety, security and comfort,” http://www.mlit.go.jp/road/road_e/pdf/chapter02.pdf, accessed Feb. 27, 2012.
2. [2] R.K. Pokharel, M. Toyota, and O. Hashimoto, “Analysis on effectiveness of wave absorbers to improve DSRC electromagnetic environment on express highway,” IEEE Trans. Microw. Theory Tech., vol.53, no.9, pp.2726-2731, Sept. 2005.
3. [3] Y. Zhang, J. Wang, Z. Zhao, and J. Yang, “Numerical analysis of dielectric lens antennas using a ray-tracing method and HFSS software,” IEEE Antennas Propag. Mag., vol.50, no.4, pp.94-101, Aug. 2008.
4. [4] E. Jehamy, G. Landrac, and M.M. Ney, “Focusing element aberration reduction procedure: Application to spherical metal plate lenses,” Proc. German Microw. Conf. 2005, pp.82-85, April 2005.
5. [5] P. Wade, “Metal-plate lens antennas,” http://www.qsl.net/n1bwt/chap3.pdf, accessed Dec. 2011.