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urgent help! --vivaldi antenna CST simulation setting

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melody1007

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Hello,everyone!
I am working on vivaldi antenna CST simulation.The S11 is very big and i think it is wrong.I did the simulation for the same model in HFSS before,and the result are quite well.So i guess the problem is CST setting,however i can't find where the problem is exactly. Can anybody help me to solve it? I appreciate...
P.S. i post the S11 parameter figure and the .cst file. Please download it and help me.
 

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