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Coupler design (matching problem)

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Hello, I have designed a branch line coupler on ads. I'm trying to match the ports to 50 ohms.
I would like to ask what is the difference between "Zin" and "impedance" showed on ADS? (i added screenshot)
1.PNG
2.PNG
thank you
 

Input Impedance ( Zin) should be demonstrated as follows.The other representation shows weird result because Mag(Zin) x cos Arg(Zin) should show the Real Part of Zin but..There is an error or a ADS bug
Impedance.png
 
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