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Some questions about Gating Effects in Time Domain Transforms?

Question asked by mindhen on Apr 7, 2017
Latest reply on May 18, 2017 by Dr_joel

In Dr.Joel's book and the paper titled "Gating Effects in Time Domain Transforms", the  the following is given.

 

"The VNA time domain compensates for this roll-off through a post-gate renormalization. The post-gate renormalization is a function determined by creating a frequency response that is unit magnitude. A pre-gate window is applied to this unit-response that is the same as the pre-transform window applied to the normal frequency response data.................."

 

I can't undersatand why the pre-gate window is used. I thought that the final normalizing frequency response could be caculated without the pre-gate window.

 

look forward the reply!

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