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

How long piece did you simulate?  If there is mismatch on the line and 
the line is a fraction of wavelength long at the highest frequency, you 
wont see the characteristic mismatch ripple, only the weird uptick in s21.

Regards,

Istvan Novak
SUN Microsystems

On 07/27/09 14:43, Chen Jikai wrote:
> 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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