reflection and transmission for array antenna in HFSS

Hi
I want to simulate an array antenna and measure its reflectance & transmittance
So I build unit cell of my structure and define its bottom sheet as waveport.
Then master/slave for its side boundary conditions is defined. At last floquet port is set to its up unit cell's sheet.
After simulation, in S-parameters I couldn't find any results.
please help me how can I fix this problem. Is this method right?
Thanks