A.A. Potapov – Member of Russian A.M. Prokhorov Academy of Engineering Sciences, Dr.Sc.(Phys.-Math.), Professor, Main Research Scientist, Kotel'nikov IRE of RAS (Moscow)

E-mail: potapov@cplire.ru

I.V. Rakut – Ph.D.(Phys.-Math.), Senior Research Scientist, Radiophysical Research Institute of Lobachevsky State

University of Nizhni Novgorod

E-mail: rakut@nirfi.unn.ru