Discussion
What is the gain of an aperture proportional to?
Answer: D
The aperture gain relation makes gain proportional to effective area and inversely proportional to the square of the wavelength, so both a larger dish and a higher frequency raise it quadratically. The other options get the powers or the direction of the wavelength dependence wrong. Because the relation ties an electrical quantity to a physical one, it is the bridge between the mechanical design of a structure and the link budget it has to satisfy, and it is used more often than any other formula in this field.
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