Define waveport in radiation boundary HFSS 9.0??

Hi all,
I am going to try defining radiation boundary contains waveport. From my friends, I heard that if I define PEC with initial point of waveport, this problem can be solved but When I tried to define this PEC with waveport, result was unexpected.Then, I put my design here, if anyone help me, I will be so thankful.
Thanks