How to feed this structure?

Hi guys,

 

I am using FEKO to do a simulation, the configuration of which is shown below:

 

It is essentially a transmission line sandwiched between two dielectric materials and a ground. So I created a model in feko, but encountered the problem of feeding this structure: In reality I want to use a coaxial cable to feed this structure, but there isn't an equivalent in FEKO. Previously I was creating a line connecting the ground and the transmission line, then use a wire port to feed it. But I don't think this is the smartest solution.

 

Could you please give me some suggetions? Many thanks!