Circular Polarized Farfield Source

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Is it possible to import a circular polarized far field equivalent source as a feed to a large reflector?

 

Hope you can help!

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Answers

  • Mel
    Mel Altair Community Member
    edited June 2019

    Hi ZJS

     

    Of course.

    Let's say you solved a circularly polarized horn antenna and exported the farfields to *.ffe file.

    Then this *.ffe file can be used as a farfield source (in place of the horn's full model). This will be an exact representation (in the far field) of the original horn, meaning it will be circularly polarized.

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2019

    Okay, how about as a .dat file? I am importing my own farfield data from a chamber and I am having some issues with how it is importing the electric field values. What I see plotting the data in matlab, is not what is showing up in FEKO. Have you had this issue before?

  • Mel
    Mel Altair Community Member
    edited June 2019

    Hi ZJS

     

    You can use an external file, yes. The format is described on pages 983 and 984 of the UserManaul.pdf (2018.2 version).

    You must also be careful with the points theta=0 and theta=180 degrees - the unit vectors differ depending on the angle phi and thus Etheta and Ephi will differ, but the total field will be the same.

    You can check this by creating a small test model with a few far field points and exporting&viewing the *.ffe file.

     

    far_field_ext.png

     

     

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