In Satellite Communications, the increasing demand for high data-rate is leading to innovative multi-beam and multi-band antenna architectures to be embarked in Geostationary Orbit (GEO) platforms. The ultimate goal is to increase the overall system capacity, while decreasing the system cost, so as to compete with terrestrial communication infrastructures. As in terrestrial networks, very high capacity can be implemented in GEO networks by exploiting spatial diversity, which, in turns, requires multi-spot coverages. In these system architectures, the geographical area of interest is divided into several small spots each one illuminated by an antenna beam operating at a giver “color”, defined as a specific combination of physical resources, namely frequency band and polarization.