Please let us know how are you connecting the SMA connector pins to the loop antenna in the real experiment.
It looks like the simulation is not set up according to the real experiment. In general, the port exciation should be connected between the two opens ends of loop antenna. But as per your description it is not the case. Correct me if I am wrong.
If you are new to Ansys HFSS simulation, then you can connect the two open ends of the loop antenna with a rectangular sheet and assign lumped port instead of using a SMA connector.
All the very best, Praneeth.
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