using HFSS for simulating of FSS dual bandstop filter (0.9 and 1.8 GHz), a Floquet-Port needs to be assigned at an appropriate height over the surface. How much is that height supposed to be? and how can I be so sure of the results if any small change in this height dramatically changes the results??

what should be the Deembed distance?

and what is the value of Solution Frequency in the Driven  Solution Setup?

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