help in cst....defining CPW ports

I am trying to implement a cpw antenna for uwb frequency range.I have drawn the structure but im finding it difficult to define ports. Can anyone tell me how to define ports for a cpw antenna.....width of the feedline=3mm and spacing=0.3mm
im enclosing my cst files here in

Hi,

try:

http://www.cst.com/Content/Showroom/Default.aspx - Construction and Simulation of a via transition - there is cpw too.

or the best is use help, try search "Microstrip Lines port" and it is first link
and Microstrip Line.

I hope, that I helped you. If not, give me question