FEKO Gain

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

How does FEKO measure gain? I have a turnstile antenna design that uses a 90degree hybrid coupler (touchstone imported from the manufacturer) and two transmission line delay elements which produces gains from -24dBi to -33dBi, but when I attach equivalent sources instead of the coupler I see the expected 6dBi to -4dBi. I can't figure out why.

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Answers

  • Johan_Huysamen
    Johan_Huysamen
    Altair Employee
    edited December 2016

    Dear chuffine

     

    While I cannot specifically see what might be causing your problem, I can suggest a test that might help:

     

    In a FEKO model that only includes your feed network (no antenna geometry and ports), request an S-parameter calculation between your network input port (Hybrid.Port1 I assume) and your four output ports (Feed_0.Port2, Feed_90.Port2, Balun.Port2 and Balun_1.Port2).

     

    This should give you an indication if the network is functioning as expected or not.

     

    Regards,

    Johan H

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