Mechanisms of radio propagation: electromagnetic waves, polarization, propagation in free space. Propagation on flat terrain, Fresnel zones. Propagation on irregular terrain. Model of losses due to propagation: empirical models, physical models, deterministic models. Propagation indoors. Mobile radio channel and models of shading: slow shading and fast shading (propagation by multiple paths, broadband channels). Spatial radio channels: MIMO systems, the characteristics of MIMO channels, MIMO channel models. UWB systems and channel models: UWB propagation and signal transmission, broadband UWB channels, applications. The use of models for dimensioning wireless networks.