1. Kotel'nikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, 125009 Moscow, Russia
2. National Research University “Moscow Power Engineering Institute,” 111250 Moscow, Russia
3. Department of Engineering, University of Messina, I-98166 Messina, Italy
4. Department of Electrical and Information Engineering, Politecnico di Bari, I-70125 Bari, Italy
5. Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, I-98166 Messina, Italy
6. Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russia
7. Laboratory “Metamaterials,” Saratov State University, 83 Astrakhanskaya street, Saratov 410012, Russia
8. FELIX Laboratory, Radboud University, 6525 AJ Nijmegen, The Netherlands
9. Oakland University, Rochester, Michigan 48309, USA