1. Department of Electrical, Electronics and Computer Engineering (DIEEI), University of Catania, Viale A. Doria 6, 95126 Catania, Italy
2. Department of Information Engineering, Infrastructures and Sustainable Energy (DIIES), University Mediterranea of Reggio Calabria, Via Graziella, Localita Feo di Vito, 89124 Reggio di Calabria, Italy
3. Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council of Italy (CNR), Via Diocleziano 328, 80124 Napoli, Italy