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Haj Hassan

strange Results

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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

 

option.png

different permittivität.png

Setup.png

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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?

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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

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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.

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