Isolation of two antennas using HFSS

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sloty

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hai all,
My transmit& receive antennas are endfire type and separated 1m distance.i wanated to estimate Isolation of two antennas using HFSS.I simply placed two antennas at 1m distance inside the radiation boundary.
each antenna have its own waveport excitation.when i plot S21 i am getting high value of -200dB which is very high compared to expected value.How to calculate Isoolation using HFSS any body help me.
 

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