[SI-LIST] ADS Momentum simulation of a differential transmission line

Hi all,
We have been simulating a differential microstrip using ADS Momentum. One weird 
thing we observed is that the loss is not monotonic. S21 rolls off as expected 
from DC to around 30G. However, from 30G, it increases until about 60G. Since 
it's just a simple transmission line, involving no discontinuities, shouldn't 
S21 be monotonic? Does anyone know what could be causing this problem?

Thanks a million in advance.



      

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