Title :
Central blocking in symmetrical Cassegrain reflectors
Abstract :
The decrease in gain and the increase in the first sidelobe level, caused by aperture blocking by the subreflector in a Cassegrain antenna, are investigated. These effects, which are highly dependent on the nature of the aperture-distribution function and greatest for highly tapered illuminations that produce low sidelobes in the secondary pattern, are quantified.<>
Keywords :
antenna radiation patterns; reflector antennas; Cassegrain antenna; aperture blocking; aperture-distribution function; central blocking; gain; highly tapered illuminations; secondary pattern; sidelobe level; subreflector; symmetrical Cassegrain reflectors; Aperture antennas; Equations; Feeds; Lighting; Reflector antennas;
Journal_Title :
Antennas and Propagation Magazine, IEEE
