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Wrong HFSS Simulation result

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ramin.ala

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Hi everyone
I've simulated a coupled line band-pass filted using HFSS 2015. S11, S22, and S21 are reasonable and like my expectation, but S12 is irrationally deformed in passband. See below photos:



I used fast sweep, I used different Solution frequencies (in some cases the problem was solved).

Have anyone faced this problem and help me?
Thanks in advance
 

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