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hello
is S11 of single stub matching network must equal S22? and is it necessary for both to satisfied matching ?
I can only tell you that it is a passive structure(circuit) and you can not have S-parameters greater than zero dB.
So there must definetly be something with your simulation setup or drawing in HFSS.
Hmmm....you have a constant impedance over the whole frequency range. That can not be possible for a frequency dependent network.