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Optimizing multimode horn feed arrays for offset reflector antennas using a constrained minimization algorithm to reduce cross polarization

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2 Author(s)
K. K. Shee ; Dept. of Electr. Eng., Kentucky Univ., Lexington, KY, USA ; W. T. Smith

This letter presents an algorithm for suppressing the cross polarization of single offset reflector antennas illuminated by a cluster of multimode horn feeds using a constrained minimization routine. The design variables are the mode ratios for the higher order modes excited in the feeds relative to the dominant TE11 mode. The goal is to systematically determine the optimum mode ratios such that the overall crosspole performance of the reflector antenna improves relative to the single TE11 mode excitation. The multimode horns considered are Potter-type (dual mode) horns and trimode horns

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:45 ,  Issue: 12 )