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HFSS9.2 Problem,radiation efficiency>0.9 ,but max Gain&lt

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lydu

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Hi, everyone

I simulated a very simple antenna in attachment. As I known, idea sphere pattern's Directivity is 0dB. if pattern isn't sphere, the max directivity should be more than 0dB.
who can explain the caculated result or point the error.

thanks in adv!

lydu
 

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