1. Department of Microwave Systems and NanotechnologyCentre Tecnologic de Telecomunicacions de Catalunya – CTTCCastelldefelsBarcelona08860Spain
2. Radiocommunications LaboratoryAristotle University of ThessalonikiThessalonikiGR54124Greece
3. Spectrum DepartmentEETTThessaloniki State AirportThessalonikiGR55103Greece