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 V.V. Mitrofanov - Post-graduate Student, Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky E-mail: ip.boyar@gmail.com I.N. Saliy - Dr. Sc. (Phys.-Math.), Professor, Department 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, Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky E-mail: slepchenkovm@mail.ru V.V. Shunaev - Post-graduate Student, Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky E-mail: vshunaev@list.ru