V.A. Kozmin - Ph.D. (Eng.), associate professor, Director of research JSC «IRKOS» (Moscow). E-mail: kv@ircoc.vrn.ru
V.A. Sladkih - Post-graduate student of radio engineering department of Voronezh State Technical University. E-mail: sladkihv@mail.ru
A.V. Sitnikov - Dr.Sci. (Phys.-Math.), professor of chair of physics of solid State Voronezh State Technical University