How can I get closely matched impedance results for Infinite Ground Plane vs. Finite Ground Plane for Patch Antenna?

Lucas_22461
Lucas_22461 Altair Community Member
edited April 2021 in Community Q&A

Hello,

Apologies if this has been asked, but I could not find a specific forum post about this.  How do I get my infinite ground plane results to match fairly closely to finite ground results for a simple microstrip antenna?  Attached is a FEKO model for the infinite ground plane version.  Am I setting this model up correctly with a wire port?  If so, how would I translate that to a finite ground version with finite substrate, in this case Megtron?

Edit:  I should mention that, I have been modeling this antenna for quite some time and just recently found that the infinite and finite ground planes' impedance/reflection vary by a few dB in the 77-81GHz range.  The gain patterns vary also, but that is manageable and makes sense.  

Thank you for your help,

Lucas

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Answers

  • Jaehoon
    Jaehoon
    Altair Employee
    edited April 2021

    Hello, Lucas

    I'd like to share some simulation comparison data for your structure.)

    (I included only your antenna part which is the most important.)

    image

     

    I used four different solvers in Feko as shown below.

     

    image

     

     

    As you can see above, this is not a matter of infinite or finite structure. 

    You might check more with the attached files which I simulated.

    (There is no difference if the finite area is big enough.)

     

    Of course, the far-field patterns show some difference between infinite and finite structures.

     

    Thank you.

    Jaehoon

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