1. Lab-STICC (UMR 6285), CNRS, ENIB, 29238 Cedex 3 Brest, France
2. Technological Research Institute, Ulyanovsk State University, 432017 Ulyanovsk, Russia
3. Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Ulyanovsk Branch, 432011 Ulyanovsk, Russia