Terahertz-Range Gyrodevices of Planar Geometry V.Yu. Zaslavsky, N.S. Ginzburg, I.V. Zotova, M.Yu. Glyavin, A.S. Sergeev, R.M. Rozental, A.M. Malkin and I.V. Zheleznov EPJ Web Conf., 195 (2018) 01025 Published online: 23 November 2018 DOI: 10.1051/epjconf/201819501025