S.V. Ermak1, V.V. Semenov2, M.V. Sergeeva3

1-3 Higher School of Applied Physics and Space Technologies, Institute of Electronics and Telecommunication,
Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

1 serge_ermak@mail.ru; 2 vladimir_semenov@mail.ru; 3 sergeeva_mar_vyach21@mail.ru