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Error: transmission line requires valid port

Axel Sombo

I am new here. i tried to simulate a LPDA Antenna. there is a step where I need to create a transmission line. But I alwys get the same error.: transmission line requires a valid port. I dont know how to set the port. It has been tree days that i am trying with every tools that I have but nothing.

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English

Feko

v2024

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Torben Voigt

Hi Axel,

Could you share the model?

Also I attached a small pdf with Tipps for new Feko users.

Best regards,
Torben

Feko – How to get started.pdf

Axel Sombo

Hi Thorben,

Thanks for replying so fast! I could fix the problem but now I get an error 80 when I try to run the solver.

I atached my model.

LPDA_Antenna_pattern.fek

Torben Voigt

Hi Thorben,

Thanks for replying so fast! I could fix the problem but now I get an error 80 when I try to run the solver.

I atached my model.

Hi Axel,

The .cfx file is the model, the .fek file contains information for POSTFEKO. Could you attach the .cfx file?

Spoiler: The problem is probably the wire radius. If you look at the mesh of the model you'll see:

Best regards,
Torben

Axel Sombo

yes sure ! I assume you mean the .out file right ?

LPDA_Antenna_pattern.out

Axel Sombo

i also have those one

LPDA_Antenna_pattern.cfm

LPDA_Antenna_pattern.cfx

Torben Voigt

yes sure ! I assume you mean the .out file right ?

Thanks, .cfx file (model) is sufficient.

Will look at it now.

Torben Voigt

Hi Alex,

Each of your wires has its own mesh radius defined. So far, so good. But unfortunately many of the the radii are too large, so the wires overlap. In addition, the short wires are meshed by the mesher with only one segment, which leads to Error 180.

I have set all radii to 1e-5 m and applied a local mesh to all wires so that it is a working model. Have a look at the attachment.

Best regards,
Torben

LPDA_Antenna_pattern_alt.cfx

kcojo

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