Lumped Capacitor in the RF Module, eigenfrequency

Hello all,

I'm using 4.4, and I realize it is impossible to add Lumped Capacitor and Lumped Inductor in RF Module Eigenfrequency study.

(but lumped elements with Z value is possible, and Lumped Capacitor or Lumped Inductor is possible for frequency study)

I think it is because Comsol is looking for a frequency, so if you only give capacitance, how it can calculate impedance lol. My current solution is hand calculate a Z value with approximated frequency and input this Z value, then look for eigenfrequency.

Then my question is, how to use lumped element with capacitor type in Comsol? Is 5.1 or 5.0 can fix this problem? Or any other brilliant solutions?

Regards,
Jared