Discussion
Assertion (A): Holding the physical aperture constant, a link improves as frequency rises.
Reason (R): Gain rises as the square of frequency for a fixed aperture, which outweighs the rise in path loss.
Select the correct answer from the options below.
Answer: A
Both are true and the reason is correct. Path loss rises as frequency squared but each antenna's gain rises as frequency squared as well, so with fixed apertures at both ends the net effect is an improvement proportional to frequency squared. This is why satellite and point to point links have migrated steadily upward in frequency. Atmospheric absorption and rain attenuation eventually reverse the advantage, which is what sets the practical ceiling for each kind of link.
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