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

D.S. Shmygin – Post-graduate Student, Assistant, Department of Radiotechnique and Electrodynamics, Saratov State University named after N.G. Chernyshevsky