Dispersion diagram of EBG using HFSS

Hi,
I want to plot dispersion diagram of unit cell of EBG structure in HFSS. I define an airbox that comprises whole structure and use Master/Slave Boundary on side walls and PML on top of it. But when I check validation, software gives warning: PML group 'PMLGroup1' part 'PML_Box1' is contained by object 'airbox' . Do you know that what mean this warning? Please help me.

Hi Zahra,

This link has a tutorial for dispersion diagrams, hope it's helpful :)

http://www.emtalk.com/forums/viewtop...ght=dispersion