O.E. Glukhova - Dr. Sc. (Phys.-Math.), Professor, Head of Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky. E-mail: GlukhovaOE@info.sgu.ru I.A. Kupriyanov - Undergraduate, of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky. E-mail: iliya-93-shadow@ya.ru I.N. Saliy - Dr. Sc. (Phys.-Math.), Professor, of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky. E-mail: sin@sgu.ru M.M. Slepchenkov - Ph. D. (Phys.-Math.), Associate Professor, of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky. E-mail: slepchenkovm@mail.ru