1. Institute of Telecommunication and Electromagnetic Compatibility, Czestochowa University of Technology, Czestochowa, Poland
2. Department of Hydrogen Energy, AGH University of Science and Technology, Krakow, Poland
3. Institute of Advanced Energy Technologies, Czestochowa University of Technology, Czestochowa, Poland
4. Magnetic Research Center, Magneto Ltd., Czestochowa, Poland
5. Magneto Ltd., Czestochowa, Poland