M.V. Davidovich – Dr.Sc.(Phys.-Math.), Professor, Department of Radiotechnique and Electrodynamics,  Saratov State University named after N.G. Chernyshevsky

E-mail: davidovichmv@info.sgu.ru

R.K. Yafarov – Dr.Sc.(Eng.), Professor, Saratov branch of Kotel'nikov IRE of RAS E-mail: piprc@yandex.ru