Input impedance and S11 is different

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baby_1

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VSWR(measured by Input impedance) and S11 is different

Hello
I designed a simple corner reflector with HFSS and I set terminal impedance to 75 ohm.Here is my Hfss output S11 and input impedance of my antenna.

(So at F=8 Gighz we have S11=Gama=10^(-10.7358/20)=.2905

(as you see at the F=8Ghz image part is approximately around 0 and so we have Gama=(75-31.91)/(75+31.91)=.403

both of them are so different !!!! what is my mistake?
 

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