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Unloaded Quality Factor (Eigenmode)

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q23lsd

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Hi all,

I have a problem with modeling of SIW cavity resonator in HFSS. Expected frequency of the 1st resonant mode ~ 5GHz, substrate material - "clone" of standard FR4 (permittivity and loss tangent changed). After calculation result looks well (real part of complex frequency close enough to 5GHz), but I accidentally notice that Q has different values in dependence from Minimum Frequency in Setup settings, e.g.

MF,GHz Q
1254
482

I don't understand why it happens, and which value of Q is correct. I'll be appreciate any suggestions.

Regards.

View attachment 5 Ghz Eigen check Q.rar
 
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