Research papers

Contoured beam antennas may conveniently be designed by shaping the reflector surface to produce a gain pattern which closely resembles the prescribed coverage area. The most appropriate technique is based on using physical optics (PO) to calculate the far-field pattern…

The effects of reflector surface distortions for a paraboloidal pencil beam reflector antenna are well understood. The peak gain reduction is proportional to the surface error squared, whereas the influence in the side-lobe region is linearly proportional to the surface…

Spacecraft antennas with elliptical beams, low cross polarization and low side lobes can be designed systematically using Geometrical Optics (Viskum et al, 1992). By controlling the amplitude taper of the aperture distribution through the shaping, low side lobes can be…

The spectrum of creeping waves that can exist on the sur­face of a dielectric coated cylinder is determined by the poles in the Green’s function for the cylinder. Accounts of the position of these poles may be found in the…

The INTELSAT VIII spacecraft will carry two steerable spot beam antennas for operation in the Ku-band (10.95 – 12.75 GHz Tx; 14.0 – 14.5 GHz Rx), thereby continuing the success INTELSAT has had since the INTELSAT V spacecraft generation in…