strange Results

Haj Hassan
Haj Hassan Altair Community Member
edited October 2020 in Community Q&A

Hello,

I am trying to see the different radiation pattern for several materials with different permittivities.

To make my simulation easier, i used planar multilayer substrate.

When i check the results i found something strange.

The higher the permittivity , the higher the reflection of the waves will be. This is correct  in the results.

But the strange is in the case of the transmitted waves!!!!

In general the higher the permittivity , then the lower the transmitted waves will be, which is not my case?!?!?!?!?

Why is this happening? I think i made a misstake in the options.

 

Thanks in Advance.


Best Regards

Haj Hassan

 

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

<?xml version="1.0" encoding="UTF-8"?>different permittivit t.png

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

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Answers

  • Torben Voigt
    Torben Voigt
    Altair Employee
    edited August 2019

    Hi @Kuzi,

     

    I can only see a small part of the polar plot. Are you sure that the main lobes are in the theta = 180° direction?

    Could you attach the files (cfx, fek, bof, out)?

  • Haj Hassan
    Haj Hassan Altair Community Member
    edited August 2019

    Hello, 

    thank you for your answer.

    Attached you will see my model.

    The waves are going in the angle 270.

     

    Thanks in Advance.

     

    Best Regards

    Haj Hassan

     

    Unable to find an attachment - read this blog

  • Torben Voigt
    Torben Voigt
    Altair Employee
    edited August 2019

    Hi @Kuzi,

     

    this doesn't seem to be the correct model. In your pics I see an antenna structure and also a polar plot of far field results. In the attached model only a plane wave excitation is present and the far field request is set to 'Calculate fields in plane wave incident direction'. Could you please check?

  • Haj Hassan
    Haj Hassan Altair Community Member
    edited August 2019

    Hello,

    sorry i sent you the wrong email.

     

    Best regards

    Haj Hassan

    Unable to find an attachment - read this blog

  • Torben Voigt
    Torben Voigt
    Altair Employee
    edited August 2019

    Hi @Kuzi,

     

    To save time it would be good to also have these files: fek, bof, out.

  • Anetlam
    Anetlam Altair Community Member
    edited August 2019

    I get odd results when analysing turbo sessions-the distance doesnt show until I set it to manual data entry-and the power calcs are all over the place -negative ones as well should I set the garmin to not use GPS? or is it something fundamental with the settings?
    thanks in advance

  • Haj Hassan
    Haj Hassan Altair Community Member
    edited August 2019

    Hello, 

    i hope that this file will help you.

    Thanks in Advance.

     

    Best regards

    Haj Hassan

    Unable to find an attachment - read this blog

  • Torben Voigt
    Torben Voigt
    Altair Employee
    edited August 2019

    Hi @Haj Hassan,

     

    interpreting the far field in a lossy halfspace unfortnately isn't easy. When using the Reflection Coefficient Approximation for example, FEKO deactivates the computation of far fields below z=0 completely. In principle the far field in FEKO is computed in an infinite distance by neglecting the term exp(-j*beta*r)/r. bet however is different for the two media..

     

    I would suggest to rather calculate near field values in a certain distance if you're really interested in the field below ground.

  • Haj Hassan
    Haj Hassan Altair Community Member
    edited August 2019

    OK

    thank you very much.

     

     

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