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: glukhovaOE@info.sgu.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 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.), асс., Department «Radioengineering and Electrodynamics», Saratov State University named after N.G. Chernyshevsky. E-mail: slepchenkovm@mail.ru