Yu.E. Kalinin - Dr. Sc. (Phys.-Math.), Professor, Head of Department of Solid-State Physics, Voronezh State Technical University. E-mail: kalinin48@mail.ru A.V. Ostankov - Dr. Sc. (Eng.), Associate Professor, Professor, Department of Radio Engineering, Voronezh State Technical University. E-mail: avostankov@mail.ru N.N. Schetinin - Lecturer, Department of Bases of Radio Engineering and Electronics, Voronezh Institute of the Russian Federal Penitentiary Service. E-mail: nikita.shetinin@mail.ru