HFSS - How to simulate an incident wave into a wall

Hi!

I'm trying to study the effect of an incident wave into a wall surface which has a probe through it, using HFSS.
The goal is to study the effect of the probe analysing the E field in both sides of the wall. (like an external antenna radiating directely to the wall )

I don't know how to define the proper excitation.

I have read about floquet ports and PML but we don't know which use.

If someone could help me, I would be grateful.

Best regards,