Research papers

The paper describes the design of a dual reflector spacecraft antenna with a circular main reflector aperture shaped to produce an elliptical beam. A design is made with two different subreflector shapes which, when used with the same shaped main…

The generally highly shaped service area for a satellite antenna may change during the planning or manufacturing of the spacecraft as well as during its in-orbit life time. This paper presents results showing the extent to which such changes can…

The scattered far field from a halfwave dipole illuminating a perfectly conducting quarterplane is calculated. The calculation is based on a calculation of the radial electric and magnetic field components on the far-field sphere, using uniform geometrical theory of diffraction…

Contoured beam satellite antennas are usually designed by optimizing the antenna gain pattern over the desired coverage such that the minimum gain is maximized and the ripple throughout the region minimized. Furthermore, if frequency reuse is applied by means of…

The paper demonstrates how multi-beam antennas used for contoured beams in communications satellites are capable of providing very high isolation to adjacent service areas, even with antenna diameters that are smaller than dictated by the normal design rule. The isolation…