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Import model from CST studio suite to FEKO

Hello!

I would like to ask you for some help with my problem connected with importing my antenna model from CST to FEKO. It imported without any problems and the model is shown in FEKO somehow it's not possible to simulate.

I suppose that there is problem with materials because everything is one material(PEC). There should be dielectric too and I can't go into properties to change the material.

Probably there are more problems. During the simulation I get errors which I link to that post.

I exported my model with file extensions like : .stp .igs .nas.

How can I solve this problem??

image.png.a17c1cd0c058499170758cc880bb4363.png

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Madelé

Hi Pawel

You should ensure that the mesh of your model is correct. Before creating a mesh, you need to union objects that touch each other to ensure electrical connectivity. You can do this by selecting the touching parts and pressing 'U', the keyboard shortcut for Union (alternatively select Union on the Construct tab in the Modify group).

There should be dielectric too and I can't go into properties to change the material.

Does the imported part show a region in the details tree? Can't you open this region's properties dialog? It would help if you could attach an example model or screenshot of what you see. It sounds like you need to define a medium and open the region properties in order to apply the medium to the part.

Altair Forum User

Hello M van der Merwe,

Below is what i see in FEKO. I can't change the material in face but i can in regions. I added teflon and this material is avaiable in regions. Unfortunetly another material from the group of metals for example Aluminium is inaccessible. My antenna is made from Aluminium so I need use this material.

I don't know what i should to do the unions, which parts i should link?? What is the rules about connecting the parts?

I have a problem with triangles, a grid. I do not know how to solve this problem.the CST grid is probably not suitable for simulation in FEKO. I am not able to do this project in feko anew because I do not know this software and soon expire my time to pass my Master of Science.

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

Madelé

Hi Paweł

I don't know what i should to do the unions, which parts i should link??

It is only required to union touching parts, but if in doubt you can union all parts in your model.

I can't change the material in face but i can in regions . I added teflon and this material is avaiable in regions. Unfortunetly another material fro m the group of metals for example Aluminium is inaccessible.

You should be able to apply the dielectric to a region, so that sounds correct. You can set metals to faces, unless the region is PEC. If you are modelling a finite thickness, I would suggest that you remove this.

See also this comment on steps to follow when importing CAD:

I have a problem with triangles, a grid. I do not know how to solve this problem

Is this a different problem or related to the model shown above?

Kind regards
Madelé

Altair Forum User

Hello Madele!

All model is made from Aluminium in CST but after importing it converted into PEC, I don't know why.

I have a problem with triangles, a grid. I do not know how to solve this problem

Is this a different problem or related to the model shown above?

This is link with to this one model all the time;)

Can I attach the file with my model? Can you check my project in feko on your computer and indicate errors?

Best wishes

Paweł

Madelé

Hi Paweł

All model is made from Aluminium in CST but after importing it converted into PEC, I don't know why.

As stated in the comment I referenced above, 'Material parameters, substrates and face settings (whether PEC or dielectric surface etc.) are parameters that will not be included/translated with CAD exports.'

What does it mean remove finite thickness?

You can model your antenna using faces, instead of regions with finite thickness. Then you can set the metal (Aluminium) on the face and include the thickness when specifying the face properties:

image.png.fda053f56352f2df683dbb0e25714660.png

Can I attach the file with my model? Can you check my project in feko on your computer and indicate errors?

Yes, you can attach your model if you would like me and others on the forum to provide suggestions specific to your model.

This is link with to this one model all the time;)

1

Can you explain what you mean by 'I have a problem with triangles, a grid'?

Altair Forum User

Can you explain what you mean by 'I have a problem with triangles, a grid'?

I have problem with mesh, this error (error 832) I show in first post . I think that this error is related with problem to choose metalic but not only.

ERROR 832 - ' two triangles touch without a common edge ' I have no idea if I have to fix the mesh in CST studio suite or in Feko ?