HFSS Impedance determination

Hi all,

I am simulating a pretty simple monopole antenna and aground plane place after a gap. I have simulated the results with waveport and lumped port - got VSWR = 1.6, and required gain patterns but when I check the Z11 - real and imaginary , I get around 0+5j. What have I done wrong? I need the input impedance of the antenna.

Please advise.



I think I am not assigning the waveport characteristics correctly - how do I define that the port has a 50 Ohm or 75 Ohm resistance?

A waveport should automatically have the correct impedance for what it's connected to (see HFSS documentation). You can always renormalize this value too ay 50 Ohms if you want -- look into the excitation settings.