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HFSS 9.2 - Ploting Gain vs Frequency of simulated antenna

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mahojazz

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Hi,

i am having problem ploting the gain vs frequency plot using HFSS. My S11 is having a reading of better than 10dB with a bandwidth from 25Ghz to 35Ghz, and the return loss at 20Ghz is ard 2dB, meaning most of the signal is being reflected. But when i plot the gain vs frequency plot, the gain at 20Ghz is much higher compared to the gain at 30Ghz. Does anyone has any experience ploting the gain vs frequency plot in HFSS? What are the things i should take note of? Thanks
 

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