Title :
Improving the symmetry of radiation patterns for offset reflectors illuminated by matched feeds
Author :
Prasad, K.M. ; Shafai, Lotfollah
Author_Institution :
Dept. of Electr. Eng., Manitoba Univ., Winnipeg, Man., Canada
fDate :
1/1/1988 12:00:00 AM
Abstract :
The large difference between the dominant sidelobe levels in the asymmetric and symmetric plane radiation patterns of the short-focal-length offset paraboloids is minimized by illuminating the reflector with a prime-focus tilted matched feed. The amplitude of the asymmetric mode (TE21) component in the matched feed is numerically evaluated for achieving an optimum peak cross-polar level. Effect of the feed tilt on the reflector efficiency is also indicated
Keywords :
antenna feeders; antenna radiation patterns; reflector antennas; dominant sidelobe levels; feed tilt; matched feeds; offset reflectors; optimum peak cross-polar level; radiation patterns symmetry; reflector antennas; short-focal-length offset paraboloids; Antenna feeds; Antenna radiation patterns; Antennas and propagation; Apertures; Atmospheric measurements; Coaxial components; Interference; Lighting; Pattern matching; Polarization;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
