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A strange phenomeneon about a CP antenna?

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fishyxl

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Hi, my friends:
when i was simulating a circularly polarized antenna with HFSS simulation software, i found a very very strange phenomena. The Gain was 1.6 dBi higher than the Directivity. As you know this should not happen because its like 0 is greater than 1.
Do you have the same experience? Is it because of the converenge in HFSS or something else?
Looking forward to your replies!
Thank you very much
 

are u sure they are at the same frequency?
 

Yes, I am sure.
Have you encountered this before?
 

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