Agilent Momentum thick conductor problem Опции

[grujic]

I have a problem with Agilent Momentum.
When I try to deembed a line which is on thick conductor layer, Momentum issues a warning that the thick conductors are not supported for deembedding and that it will use 50 Ohms for de-embedding.
Is there a solution for this problem?

[Alex_IC]

You can simulate the thick conductor line separatly and de-embed it in schematic with de-embed element.

[grujic]

Thank you for the idea.
What about port settings for the thick conductor line?
Should both ports be single ports?

[Alex_IC]

Thank you for the idea.
What about port settings for the thick conductor line?
Should both ports be single ports?

I think single ports should be ok.

[grujic]

Ok, thank you. I'll try that.

[VitaliyZ]

Should both ports be single ports?

It depends on the transmission line you are trying to excite.
If we talk about microstrip/strip lines, then the single port is actually the only port you are allowed to use (avoid internal ports for excitation of your structure).

If you use other types of transmission lines (coplanar, etc.), please refer to ADS help for the appropriate port configuration.

[grujic]

Could you please be more specific about port definitions for non-microstrip lines?

The other question is how to treat coupled (differential) microstrip lines. Will the single ports give the accurate result, or should the even and odd mode be simulated separately with differential and common mode ports?

[VitaliyZ]

Could you please be more specific about port definitions for non-microstrip lines?

For example, for the coplanar waveguides, Agilent suggests to use "Coplanar Port"
It really depends on what type of mode you want to excite.
In short, if you are going to simulate a planar structure with a ground plane, the single port will do in most of the cases.
So, don't bother.

The other question is how to treat coupled (differential) microstrip lines. Will the single ports give the accurate result, or should the even and odd mode be simulated separately with differential and common mode ports?

My experience tells me, that a single port will be just fine for your case.
You can always build a circuit model in Schematics and compare it with the Momemtum simulations. If you messed up with the ports, you'll see a huge difference between the data obtained from Schematics and Momentum.

Good luck!

[grujic]

Thank you very much for the explanation.
I will have these things in mind for port definitions.