Discussion
Why is a horn commonly used as a gain standard?
Answer: C
A pyramidal horn's geometry is simple enough that its gain can be calculated to within a few tenths of a decibel from its measured dimensions, which makes it a primary standard for gain measurement by substitution. Its gain is modest rather than the highest available and does vary with frequency in a known way, and it is not especially cheap. An antenna whose performance can be predicted from measurable mechanical quantities is exactly what a standard needs to be.
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