O.E. Glukhova - Dr.Sc. (Phys.-Math.), Associated Professor, Head of the Department of Radio-Technique and Electrodynamics, Physical Faculty, Saratov State University named after N.G. Chernyshevsky. E-mail: graphene@yandex.ru V.V. Mitrofanov - Post-graduate Student, the Department of Radio-Technique and Electrodynamics, Physical Faculty, Saratov State University named after N.G. Chernyshevsky. E-mail: ip.boyar@gmail.com

O.E. Glukhova - Dr. Sc. (Phys.-Math.), Associate Professor, Head of Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky. E-mail: GlukhovaOE@info.sgu.ru M.M. Slepchenkov - Ph. D. (Phys.-Math.), Assistant, Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky. E-mail: slepchenkovm@mail.ru K.R. Asanov - Master, Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky. E-mail: asanov.k.93@mail.ru