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a question about the balun

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zkmicrowave

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i want to design the wideband(2-18 GHz) double balance mixer,first i have designed the tapped balun,but it have some trouble question,in the low-band and up-band S(2,1)and S(3,1) are far away 3dB,who can tell me how i slove the problem!
follow the picture!
 

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