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T-junction power divider

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pudding

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Hi everyone,
I want to design a T junction power divider from 12GHz to 24GHz. But there is always a resonance peak at about 21GHz. Then I change the length of the arms, the peak can move a little bit according to it. Does anyone can help me to figure it out? I set up one port as 25ohm, and the other two 50ohm so that the resonance does not come from the reflection at the port. Thanks a lot!
 

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