This periodic structure was simulated by Ansys HFSS with floquet port excitation and periodic boundary conditions. I am applying floquet port with master and slave boundary. But I am not getting the same absorption peak as in paper. I am not getting how to apply this periodic boundary condition. I have attached my hfss file for your reference. If possible, Kindly go through it and tell me my mistake.

I am following this paper

Article A compact ultra-thin ultra-wideband microwave metamaterial absorber

Any help in this regard will be very much helpful. Waiting for response asap