1. Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Satpaev Str. 5, Astana 010008, Kazakhstan
2. Institute of Geology and Oil and Gas Business, Satbayev University, Satbayev St. 22, Almaty 050032, Kazakhstan
3. Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., LV-1063 Riga, Latvia
4. Engineering Research Institute, “Ventspils International Radio Astronomy Centre”, Ventspils University of Applied Sciences, 101 Inzenieru Str., LV-3601 Ventspils, Latvia