A.R. Mkrtchyan - Dr. Sc. (Phys.-Math.), academic, Institute of Applied Problems of Physics of NAS RA (Yerevan, Armenia); Professor, National Research Tomsk Polytechnic University E-mail: malpic@sci.am A.S. Bagdasaryan - Dr. Sc. (Eng.), Professor, Main Research Scientist, Kotel-nikov Institute of Radioengineering and Electronics of RAS (Moscow); Radio Research and Development Institute (Moscow) E-mail: bagdassarian@mail.ru S.H. Khlopuzyan - Research Scientist, Institute of Applied Problems of Physics of NAS RA (Yerevan, Armenia) V.R. Kocharyan - Research Scientist, Institute of Applied Problems of Physics of NAS RA (Yerevan, Armenia); Na-tional Research Tomsk Polytechnic University E-mail: vahan2@yandex.ru