CST-Coplannar Waveguide design. Something is wrong. Please help to check. thx

Hi guys, i just model a basic cpw. but i could not get the correct s-parameter result. I suspect it might be the port.
Do i need to add space? *background property*
below is the picture.

Try to model sma connector and put waveguide port on it.
https://www.edaboard.com/thread265445.html -> here you can find my example at CST2011 with modeled SMA connector

Hi bubuta77,
Thanks alot!
Appreciate the help. =D
thank you