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Resonance frequency of microstrip line

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GGAPBE96

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I did Sparameter simulation of simple microstrip line.
The resonance frequency of S11 and S21 were different.
As line loss increased,the difference also increased.

I think the both frequencies should be equal because minimum S11 means the lowest reflection,
that is to say,incident wave can pass undisturbedly...

Does anyone explain the mechanism??
 

If it is a transmission line using
microstrip then how come have a "resonance
frequency"?...I do not get it....Am I
missing something?.....
 

    G

    GGAPBE96

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Which software do you use? For the same structure, when loss increases, resonant frequency will moved down a little. The reason is the loss slows down the EM wave. But s11 and s21 should be peaked at the same frequency. I guess it's the problem of the software you used.
 

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    GGAPBE96

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