Composite Excitation in HFSS

Hi,

I need help to configure composite excitation in HFSS please.
I am simulating a simple CPW tline to get insights on this kind of simulation. But the result of S-param is always null with composite excitation.
When I return to a standard "Network analysis", the result of S-param is not null.
This kind of simulation could be usefull to be compared with GSG probe measurement.

Thanks,
Emmanuel