FEKO simulation

Hi @mkh

Good question.

There are different ways to model metals in FEKO.

Firstly, when you create a new part, the default material properties are set to PEC. For most antenna applications this is an accurate approximation. However, you can certainly model different non-perfect metal types in FEKO. And when you set a face property to e.g. copper, you will be required to enter the thickness of the metal .

I hope this helps.

Thank you, Sir. for help. but I am I wondering why the response of reflection coefficient is different if we change the type of feeding in FEKO. For example in the examples guide of FEKO the example [A8] change the feeding type for the same variable design of microstrip antenna we noticed that the far-field radiation is approximately similar but the reflection coefficient is different as shown in attached photo.

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It is likely that changing the ground plane to infinite (red curve) can change the reflection coefficient.

The difference between the blue and green curves is approximately a 1% frequency shift, which is very small. Have you done a mesh convergence study for each of the methods? I would suggest to do this first, but it is also possible that the small frequency shift is related to the differences in the  numerics for the 2 methods. 

I will do the mesh convergence study, but I wonder which method for solving will be the closest one to the measurement values.