cst microwave studio design problem.

I tried to design a DRA antenna in CST MWS whose file is attached along with.But I am not getting desired S parameters which may be because of ambiguity in applying ports to the antenna.I am applying a waveguide port at the feed line which is feeding the slot. I am supposed to generate TE mode in that waveguide port.Discrete port is applied at the the top of spitted cylinder with a wire fed inside it.
Can any-one tell me how to do that? If someone has done work related to it please reply,i can share the cst file to sort out the problem.

Thanks.