O.E. Glukhova − Dr.Sc. (Phys.-Math.), Professor,
Head of Department of Radiotechnique and Electrodynamics,
Saratov National Research State University named after N.G. Chernyshevsky
E-mail: glukhovaoe@info.sgu.ru
M.M. Slepchenkov − Ph.D. (Phys.-Math.), Associate Professor,
Department of Radiotechnique and Electrodynamics,
Saratov National Research State University named after N.G. Chernyshevsky
E-mail: slepchenkovm@mail.ru