reflectarray antenna design using Hfss and floquet port

Hi
i am working on a unit cell of a reflectarray patch antenna with slot coupled to a microstrip.
I tested the antenna with a micro strip excitation.
Now i need to test it by exciting the antenna using floquet port.
So i put master and slave conditions floquet port and then what ?
how to proceed after what are the parameters to look at ?
should the s11 of the floquet port for a certain mode be close to the S11 that i have from the case of microstrip excitation?
is there another way to get the reflection parameters like analytical calculations or the simulation is enough.