Discussion
What is the main benefit of a corrugated feed horn on a reflector antenna?
Answer: A
Because the pattern is the same in every plane and the field falls smoothly to zero at the rim, the reflector is illuminated evenly around its circumference and very little cross polar energy is generated. That is what earth stations and radio telescopes need. Its gain is comparable to a plain horn of the same size, dual band operation requires further design, and it is usually longer rather than shorter. Matching the symmetry of the feed to the symmetry of the reflector is the point.
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