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differential line loss question

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yef smith

Joined Aug 2, 2020
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Hello , I tried to build a differential line and controll the SDD21 as shown in the photo.
SDD21=S21-S41

i tried to increase the absolute s41 but the sdd21 is the difference between two complex and as you can see in the photo.
i cant get the sdd21 smaller.
Where did i go wrong?
Thanks.
 
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