Optimization S parameters

Hello,
I have the following problem.
I would have to vary the variable epsr and tan_delta, respectively the electric and tangent permittivity of loss of the dielectric that I have in the rectangular guide, so that the scattering parameters are equal to measurements made with the VNA.
How can I set everything up with the optimization search?

I set the problem in the following way but by launching the simulation I had warnings.

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Mel

Hi John1989

I don't see much wrong with your setup.

But are you sure you want to vary the permittivity from zero onwards? Does not sound realistic. Maybe rather from 1 and up? Or are you trying something in terms of metamaterials?

Also the tan delta varying up to maximum 1 is very high?

What warnings did you receive?

To make the solution faster, you can set the horizontal plane of symmetry to electric.

Altair Forum User

Recapitulate the problem.

I have measurements made with the VNA of the scattering parameters S11 and S21 with a configuration of a rectangular waveguide with a dielectric inside.
I intend to quantify the relative dielectric constant and its loss tangent.
So to get the latter I started by determining an initial value for the two, and then configuring an 'Add Search' where I configured two masks (one relating to the magnitude of S11 and the other relating to the magnitude of S21).
In the 'Goals' I defined two goals: the two scattering parameters must be the same as the two masks I defined.
In the 'Parameters' instead I made the two variables vary: epsr and tan_delta.

I wanted to know:
- Is it right how I set the problem?

I put the configuration files back because I changed the model

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Altair Forum User

Hello,
in performing the optimization in CADFEKO I found this warning.
How can I solve it?
Do I need to change the minimum and maximum values of the parameters?

<?xml version="1.0" encoding="UTF-8"?>