CST MWS waveguide port

Hi !
I am new to CSt MWS and I want to analyze a periodic structure, I use the unit cell as boundary conditions, so the software puts automatically Floquet ports. But the "Set excitation" line in the "QuickStart Guide" does not get checked.
I then run the Frequency domain solver and get results that are ok.

The only way to get the "set excitation" line of the QuickStart Guide checked is to add waveguide port to the already existing Floquet ports. But when I do this, I got exactly the same results as with no waveguide port. So I don't know if I should put them or not.

Does anyone know why the Waveguide port are needed, according to the QuickStart Guide, even if there already are other ports ?

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