Discussion
Why is time domain gating derived from a swept frequency measurement?
Answer: A
A network analyser measures across frequency, and the inverse Fourier transform of that response is the time domain response, in which paths of different length appear separated. Gating and transforming back then removes the unwanted ones. Generating a true impulse is indeed difficult, which is part of why the swept method is used, but the transform relationship is the reason it works. The antenna is linear and responds identically to either excitation.
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