Dual reflector antenna with spherical main reflector

The investigation of the design of spherical dual reflector antennas is extended without imposing any restriction on the subreflector surface. The shaping is obtained using geometrical optics, and a diffraction analysis is used to predict radiation. When compared to the work of Ramanujan et al. (1987), the geometry modifications considered allow more control over the dimension of the system, making it possible to design more compact systems. They also make it possible to increase efficiency and simultaneously to adjust the offset angle, theta /sub 0/, to reduce the crosspolar peak or to reduce the spillover effects.<>