I am trying to simulate the dispersion diagram for a folded waveguide in HFSS. I have created a unit cell consisting of one pitch. I use only one master and one slave in the direction of the waveguide periodicity and simulate a frequency sweep from 0 to PI. For some reason, I don't get reasonable results. Can anyone help me? Do I need more than one master/slave boundary condition maybe?
One M/S pair should be enough. Based on the information you've provided, it sounds like the simulation should be successful. What data are you obtaining?