Any advice for modeling impedance surfaces (for scattering problems) in HFSS?
We are trying to model a phased array antenna in HFSS using surface impedances in place of unit cells. We are getting strange results and are not able to determine what the issue is. We started by setting up a 4x4 array of square sheets. Then each is given an impedance boundary corresponding to a particular phase shift. This structure is then excited by an incident plane wave. We have had issues with the adaptive mesh not converging due to high fields on the sheets at certain frequencies. Also, the far field results we get from these studies do not match what we expect to see. We have not been able to find any helpful resources so far related to this issue. Does anyone have any advice on modeling surface impedances for scattering problems in HFSS? If any part of my explanation is unclear, please let me know and I can provide more details as well as a project file.