O.E. Glukhova - Dr. Sc. (Phys.-Math.), Associate Professor, Head of Department Radioengineering and Electrodynamics», Saratov State University named after N.G. Chernyshevsky. E-mail: graphene@yandex.ru A.S. Kolesnikova - Ph. D. (Phys.-Math.), Assistant, Department «Radioengineering and Electrodynamics», Saratov State University named after N.G. Chernyshevsky. E-mail: Kolesnikova.88@mail.ru D.A. Melnikov - Undergraduate, Department «Radioengineering and Electrodynamics», Saratov State University named after N.G. Chernyshevsky. E-mail: good.trumpet@gmail.com I.N. Saliy - Dr. Sc. (Phys.-Math.), Professor , Department «Radioengineering and Electrodynamics», Saratov State University named after N.G. Chernyshevsky. E-mail: sin@sgu.ru M.M. Slepchenkov - Ph. D. (Phys.-Math.), Assistant, Department «Radioengineering and Electrodynamics», Saratov State University named after N.G. Chernyshevsky. E-mail: slepchenkovm@mail.ru