S.V. Savel’ev – Ph.D. (Phys.-Math.), Leading Research Scientist,

The Institute of Radioengineering and Electronics of Russian Academy of Sciences (Moscow, Russia)

L.A. Morozova – Research Scientist,

The Institute of Radioengineering and Electronics of Russian Academy of Sciences (Moscow, Russia) E-mail: mila-morozova.ludmila@yandex.ru