V.G. Andrianov - Head of the Educational Laboratory of Electro-Radio-Technique, Department of Radio-technique and Electrodynamics, Physical Faculty, Saratov State University named after N.G. Chernyshevsky. E-mail: demkol.93@mail.ru 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: GlukhovaOE@info.sgu.ru D.A. Kolosov - Magister Student, Department of Radio-Technique and Electrodynamics, Physical Faculty, Saratov State University named after N.G. Chernyshevsky. E-mail: demkol.93@mail.ru M.M. Slepchenkov - Ph.D. (Phys.-Math.), Assistant, Department of Radio-Technique and Electrodynamics, Physical Faculty, Saratov State University named after N.G. Chernyshevsky. E-mail: slepchenkovm@mail.ru