s11 in microstrip patch antenna

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faranaksh

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hi
i am simulating a microstrip patch antenna in HFSS,excited by a coax,but i can not get the s11 in the paper.mine is about half of the one in the paper.please help me,what is the reason?!
 

attach file and only then ppl can help u
 

I wanted to attach the file but the error "The Extension hfss is not allowed" appeared.what shall I do?!
 

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