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Antenna group delay- HFSS calculation

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olzanin

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hfss group delay

Hello,

how to calculate antenna group delay. As I know the group delay is derivation of S21 phase (hence two antennas are necessary).
But in HFSS it is possible to calculate group delay directly from simulation with single antenna, do HFSS include second antenna?

If I measure group delay on network analyzer the result from S11 phase derivation looks similar as that from HFSS and measured S21 very different.

Thanks.
 

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