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S11 measurement of amplifier

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Freestylesoap

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Hi all,

I tested an amplifier with a network analyzer. I saw some ripples on measured S11, but that ripples actually did not appear in simulations. Does anyone have an idea what might cause these ripples?
The black trace is from measurement. The green trace is from simulation.

Capture1.PNG

Thanks a lot!
 

It's normal and coming from probably VNA test cable. ( measurement is better !!)
 

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