Discussion
What is the far field distance of a 3 m aperture at 6 GHz?
Answer: A
At 6 GHz the wavelength is 0.05 m, so twice the square of the aperture divided by the wavelength gives:
\[ \tfrac{2 \times 9}{0.05} = 360 \]
metres, that is 360 m. A range of that length is possible outdoors but inconvenient, which is exactly why near field scanning and compact ranges were developed. The quadratic dependence on aperture means that doubling the dish quadruples the range needed, and the problem becomes impossible long before the antenna does.
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