microstrip impedance simulation in COMSOL 4.0

Hello, Guys,

I did the microstrip impedance simulation through COMSOL 4.0 (RF Module), but the result is wrong. Could you let me know what is wrong in the settings? (model is attached)

If I want to simulate the differential impedance of the microstrip pairs, how can I do it?

Thank you for your help in advance!

Gator