[SI-LIST] Re: Different Simulation Results

Are you sure you are using correct _differential_ (odd mode) stimulus in 
both tools? Maybe one simulates the structure with single ended stimulus 
(only one line being driven), while the other uses differential signals 
(both lines driven, with opposite polarity). Second, I would check the 
port impedances. 20dB difference is huge (I'd expect well below 1dB if 
both tools are set up correctly and the models really match), that almost 
sounds like termination vs. open.
Wolfgang







Mohamad Haghtalab <mohaghtalab@xxxxxxxxx> 
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[SI-LIST] Different Simulation Results






Hi all
 
I've simulated two coupled parallel microstrip lines with both HFSS and 
SIwave(from 
 
Ansoft), there is good agreement between the SHAPE of Scattering Matrix 
results in two 
 
softwares,BUT in the LEVEL of them there is about 15 - 20 dB 
difference,what do you 
 
think about this?
 
Regards   

 
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