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Improving the symmetry of radiation patterns for offset reflectors illuminated by matched feeds

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2 Author(s)
Prasad, K.M. ; Dept. of Electr. Eng., Manitoba Univ., Winnipeg, Man., Canada ; Shafai, L.

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

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Antennas and Propagation, IEEE Transactions on  (Volume:36 ,  Issue: 1 )