CST - Integral Equation Solver - Coaxial Port

Hello,

I have a simple stacked patch on a finite GND fed by a coaxial connector.
I know that this should be analyzed using either FDTD or FEM for accuracy reasons, but I would like to see how of the IE does.
I do not know how to define a coaxial port in the IE solver. I understand that the IE solver does not have the same ports definitions as the FDTD or FE solvers, but is there a way to excite the TEM mode in the coaxial structure?
I goggled this and found no example.

Any ideas?

Thanks

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