question about loop antenna

Hi Guys,
I use HFSS to simulate a loop antenna. But I found out when I reduce the radius of the wire, the input impedance goes up. Does that make sense? I use the lumped port. Thanks

Yes, it makes sense.

In the attached figure you can see the computed input resistance for a circular loop. As the wire radius decreases (Ω increases) the resistance gets higher.

Actually this is the typical behaviour of wire antennas. If you check the resistance of dipole antennas it exhibits the same property.

Nice information about loop antenna thanks for sharing.