Research papers

In order to provide flexible communications service in the K-band (10.95 GHz-12.50 GHz for transmit and 14.00-14.50 GHz for receive) INTELSAT has implemented two fully steerable spot beams on the INTELSAT V and VI spacecraft. On INTELSAT V the West…

The spherical near-field geometrical theory of diffraction (SNFGTD) method is an extended aperture method by which the near field from an antenna is computed on a spherical surface enclosing the antenna using the geometrical theory of diffraction. The far field…

Reflector antenna surface distortions may be slowly varying, rapidly varying, systematic or random. Typical examples of each of these types of surface distortions are presented and their consequences on the peak gain and side lobe performance are illustrated. It is…

The still increasing requirements to satellite reflector antennas, in particular with respect to such parameters as cross polarisation and side lobe level, imply a demand for fast and accurate analysis methods by which the performance of the reflectors can be…

Although geometrical optics (GO) is an asymptotic theory describ­ing electromagnetic fields of infinitely high frequencies only, it has for several years constituted the foundation for synthesis of reflector antennas. While dual reflectors are usually shaped to produce a certain aperture…