1. Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council (CNR), Napoli, Italy
2. Department of Electrical Engineering and Information Technology, University of Naples Federico II, Napoli, Italy
3. Department of Electrical, Electronic, Telecommunications Engineering and Naval Architecture (DITEN), University of Genoa, Genova, Italy
4. Icam, School of Engineering, Nantes Campus, Carquefou, France