Discussion
Why does the same reflector perform worse at higher frequency?
Answer: C
A fixed mechanical error is a larger fraction of the wavelength at higher frequency, so the phase errors across the aperture grow and the Ruze loss rises rapidly. The physical area is unchanged and the gain would otherwise rise as the square of frequency, which is precisely why the surface eventually becomes the limitation. Feed size falls rather than rises with frequency, and atmospheric absorption is a propagation matter outside the antenna. Surface tolerance is what sets the upper frequency limit of any reflector.
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