1. 1) Ministry of Internal Affairs and Communications: Study on frequency sharing and coexistence between trend of radar system and other existing radio systems (in Japanese), <http://www.soumu.go.jp/main_content/000329022.pdf>.
2. 2) International Telecommunication Union: System characteristics of automotive radars operating in the frequency band 76-81 GHz for intelligent transport systems applications, Recommendation ITU-R M. 2057-0 (2014).
3. 3) S. Morishita: IEICE Commun. Mag. B-plus (in Japanese), 9 (2015) 136-142.
4. 4) J. Jpn. Institute of Energy: Biomass Handbook (in Japanese), Ohmsha (2002) 55.
5. 5) H. Iizuka: J. Network Polymer Jpn. (in Japanese), 31 (2010) 233-239.