Discussion
What happens to the far field distance when the aperture diameter is doubled?
Answer: B
The criterion contains the square of the aperture, so doubling the diameter quadruples the distance at which the far field begins. This is why measuring a large antenna outdoors becomes impossible so quickly and why near field scanning was developed. The wavelength does enter, but it is unchanged here, and a narrower beam does not bring the far field closer. Quadratic scaling is what turns a manageable problem into an impossible one over a modest range of sizes.
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