Define Elements in CST by S-Parameters

Hello,
I'm a student currently working on a waveguide coupler device in CST. For measuring effects of mismatch on the port, I want to define a Port that is not matched but has a defineable reflection:
At the moment, all ports of the waveguide coupler are made as "waveguide ports". I know that those simulate an infinite waveguide portion so that they are ideally matched. Is it now possible in an easy way to change this port so that i get a defined S-Parameter/Reflection coefficient at this position?
Thanks for any helpful comment on this in advance!

Hi friend
U should watching video in folder cst set up. It's very useful for beginer with cst.
u want to match with your port, i think u should tuning about your parmater when u simulate. it's difficult to talk about u
- - - Updated - - -
Hi friend
U should watching video in folder cst set up. It's very useful for beginer with cst.
u want to match with your port, i think u should tuning about your parmater when u simulate. it's difficult to talk about u