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question about filter design

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danda821

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I am designing a resonator coupled filter, so I need to find the coupling coefficient between two resonators. So I simulate the S21 through the two resonators and check the resonant frequency. But I can only see one peak, can not see the peak splitting (K12=2(f2-f1)/(f2+f1)). Is there something wrong?
 

well, if you could upload you model here , i will ask my friend to help you .
rgz
kaka
 

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