How to Graph VSWR vs Frequency

COLE SHANNON
COLE SHANNON Altair Community Member
edited January 2021 in Community Q&A

Hello all,

I am designing a Yagi type antenna and would like to create a graph to represent the VSWR of the antenna across multiple operating frequencies. The graph I would like to create would look very similar to the one I have pictured here. I do not know where to begin with this, so I am asking for help. Thanks.image 

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Answers

  • Madelé
    Madelé
    Altair Employee
    edited January 2021

    As a starting point, you can take a look at the examples in the Feko Example Guide. There is an example of an LPDA antenna and also of a Yagi Uda antenna. In CADFEKO, create the model and set the frequency range. Run the model. In POSTFEKO, add the source data to a Cartesian graph and change the Quantity to VSWR.

    I hope that helps. If not, feel free to ask further questions!

  • GGAMPALA
    GGAMPALA
    Altair Employee
    edited January 2021

    VSWR is a standard output available under the "Source Data". So, once you run the Feko model, you can go to POSTFEKO, add an empty Cartezian graph, plot the source data for the voltage source and change the quantity from 'reflection coefficient' to 'VSWR'.

  • Mel
    Mel Altair Community Member
    edited January 2021

    The Getting Started Guide, part of your installation, section 3.4, patch on an infinite substrate will detail the steps how to plot the source data. Then, as Gopinath has indicated, just change the drop-down box to VSWR.

    E.g.

    image

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