a question about HFSS!

radiation boundary is designed for the normal incident ,but the PMLs deal with varies incident angle

yes this is correct. PML allow for low reflection for several incident angles, whereas abc gives high reflection for near 90deg incident angles.

Hi,
you may use a PML as a power absorber for matching, while radiation will produce reflaction as mentioned.

Hi,
I am using HFSS for the unit cell, I wants to find S21 as function frequency for different incident angle in floquet port.
could you please suggest me what i have to do to change in the incident angle in floquet port.