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Modeling a WR-90 waveguide with one end embedded in a infinite PEC ground

User: "HONGYU LIANG"
Altair Community Member
Updated by HONGYU LIANG

Hello everyone,

I am a new comer of Altair community.

Recently I am trying to learn FEKO of Altair.

I started with a very simple example, modelling a commonly used antenna radiator, which is a WR-90 waveguide (22.86mm*10.16mm) with one end embedded in a infinite PEC ground to radiate energy into half free space.  When I complete the model and try to find its far field 3D pattern with the fundamental TE10 mode as excitation, a error box appears, which says

"The following message from the master process (MYID= 0):

ERROR 270: A triangle may not be located in the ground"

 

I have attached with this question the .cfs file of the model, could anyone help me to to find out the mistakes?

Thank you very much!

 

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    User: "Mel"
    Altair Employee
    Accepted Answer
    Updated by Mel

    Unfortunately this type of aperture in an infinite plane is not supported.

    (Note that Feko does allow an aperture or hole inside of a an infinite ground plane in for example aperture coupled patch antenna / microstrip applications where the "Plane/ground" type is "planar multilayer substrate", but connecting triangles to this aperture is also not supported)

    It is also not supported to use a different axis / change the orientation of the infinite planes.

    The alternative is to just define a very large finite plane and solve the model with MLFMM. The finite plane can have any orientation.

    The below used a an ellipse of radius 30*lam.

    image