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    Unloaded Quality Factor (Eigenmode)

    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
    1 254
    4 82

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

    Regards.

    5 Ghz Eigen check Q.rar
    Last edited by q23lsd; 2nd May 2014 at 16:01.

    •   Alt2nd May 2014, 04:42

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