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[HFSS] What does N/A mean for delta S?

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Nhera

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Sometimes the delta S value in HFSS is shown as N/A. What causes this?
 

For the first pass at that frequency, there is no previous S-parameter value to compare with, so deltaS cannot be calculate -> not applicable.

I understand the first pass. But why the 8th pass? What possible reason could there be for delta S to be not calculated
 

I understand the first pass. But why the 8th pass? What possible reason could there be for delta S to be not calculated

Additional meshing frequency oder additional convergence criteria?
 

No. Only the simple delta S criteria, only a single frequency adaptive meshing.
 

No. Only the simple delta S criteria, only a single frequency adaptive meshing.

I have difficulties to believe that - look at deltaS which jumps back to very large values after the N/A in pass 8.
I'm not an HFSS user, but I only see that behaviour in other FEM if there is multiple criteria or frequencies for mesh refinement.
 

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