50 ohms Microstrip line CST simulation

Hi
I try to simulate a 50 ohms microstrip line with CST until 10Ghz and I have a unusual behavior in the S parameters also I compared the results with momentum and the results are deferents can some body help me with the CST setup to simulate the microstrip transmission line. I attach the S12 simulated and the CST file,
thanks

Dear Eleazar_777
I executed your file with frequency domain solver in CST.
I could not see any problem.
I think your file is true.
please check it and inform me.
Tanx.
HR Kar