HFSS Wave Port sizing and field symmetry.

[neno26]

Hi,

So I have an urgent problem.
I'm trying to design a cavity/resonator coupled to a multi step CPW filter.
Now, individually everything works properly, but when I couple and try to model, it doesn't work well.
I've used the standard suggested wave port dimensions and still get nothing. The field at the port is often non symmetric which i take to mean higher order modes are propagating.

So, my question is as followed:

1) Since the two ports are at different ends with differing W and S spacing, does each port need a specific sizing?

2) Is it possible to plot (E) the field through the model as a function of say distance?

3) I've tried making a comparison with AWR and find discrepancies, is this normal?

4) How do I test to see if the right modes are propagating?

The goal is to obtain the right frequency response as to then obtain the correct real part of the Y parameter along with proper E Field profile.

Thanks. This is pretty urgent, so I would really appreciate a quick response. Thank you guys.

 

[PlanarMetamaterials]

Welcome neno26,

I assume you have the resonator in the middle of your simulation connected to a CPW line on either side? To answer your questions as best I can...

1) Yes, the ports should be roughly 4x (W+2S) wide and 4x your dielectric height. If there is no dielectric, just make the port square and center it vertically on the CPW.

2) Yes. Insert a plane longitudinally and plot your e-fields on this.

4) Select "Port Field Display" and the made you want in the left-hand panel. Or simply plot the E-fields on the port.