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Phase imbalance of a Balun in HFSS



I am designing a 2:2 stacked transformer to use as a balun in HFSS. 

I have used 4 ports to simulate this but when I see the phase difference of the S parameters of the balanced ports from one of the balanced port, the difference is not 180 degrees. (S21-S31 is not 180). Since I am designing it for the first time I have no idea how to debug this. Any suggestions are appreciated.


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