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Need help on 60GHz F antenna Simulation by HFSS

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Hi all,

I am simulating a 60GHz straight F antenna by Ansoft HFSS. I use the low-loss Rogers material(loss tangent is 0.0021) as the board material. This F antenna resonates around 61GHz(S11) . However, when I tried to get information on radiation efficiency, it turns out that the radiation efficiency is greater than "1". I don't know what's wrong with my modeling and how to improve it. Could anyone give me some advices? Thank you very much! Welcome to contact me via: hopefully81@gmail.com

Kevin
 

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