Advanced Reflector Antennas for Geostationary Spacecraft

With satellite communications on a continuous rise the geostationary arc and orbital slots as well as the frequency spectrum available becomes increasingly crowed. This directly influences the design of the spacecraft antennas as gain and isolation requirements are tightened to be compatible with this environment. Typically, two distinctly different antenna designs emerge depending on the requirements. For more regional type coverages with one shaped beam and with polarisation isolation requirements the shaped reflector antenna is often chosen. The multifeed reflector antennas fulfil the needs of multibeam antennas with stringent isolation requirements between beams that are spatially isolation. State-of-the-art designs continue to be provident by Dornier Satellitensysteme GmbH. For the shaped reflector antenna past and several on-going programmes at Dornier Satellitensysteme employ this type of design among them the INSAT-2E shaped reflector antennas which were delivered to ISRO in early 1997. For the mu...