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Why i can not get 5.8G resonate frequency in HFSS?

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TerryADS

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5.8g pifa antenna

Hi friends,
I want to design 5.8GHz PIFA antenna in HFSS as bellow,but i do not know why S11 is so poor.Anyone kindly help me find the root cause?
Thanks,
 

Anyone can give me suggestion?
 

Thanks kspalla's reply.I modified dy and dx,the result is same as the attached result(poor) and it is the same result in practice as simulation.what happan in my design?

 

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