Discussion
What is a corrugated horn used for?
Answer: D
Corrugations in the walls support a hybrid mode whose aperture field is nearly rotationally symmetric, so the pattern is the same in every plane and the cross polarisation is very low. That makes them the standard feed for high performance reflectors and for radiometry. They do not raise gain for a given aperture, dual band operation requires other techniques, and the metal removed is incidental. Achieving a desired aperture field by engineering the mode inside the structure is a powerful idea.
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