Modeling microstrip patch in FDTD with edge port

Shan25_22239
Shan25_22239 Altair Community Member
edited March 2023 in Community Q&A

In the attached CADFEKO file modelling a microstrip line with a defective ground plane using FDTD solver. When I tried to mesh the geometry I get the below error message 

imageI tried defining a local mesh for the geometries where the port 1 and 2 is located, but the number of voxels increases considerably. Can you please look at the model and let me know how to model the structure using FDTD solver  

test.cfx 170.3K
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Best Answer

  • Torben Voigt
    Torben Voigt Altair Community Member
    edited March 2023 Answer ✓

    Hi @Shan25 ,

    I guess the geometry is just too small for the frequency range and the FDTD mesher. The problems here arise from the 18 µm thick PEC regions. These are not necessary from my point of view, and I have deleted the corresponding faces. Then I refined mesh and so it should work now.

    image

    Is there a particular reason you want to use FDTD here?

    Best regards,
    Torben

Answers

  • Torben Voigt
    Torben Voigt Altair Community Member
    edited March 2023 Answer ✓

    Hi @Shan25 ,

    I guess the geometry is just too small for the frequency range and the FDTD mesher. The problems here arise from the 18 µm thick PEC regions. These are not necessary from my point of view, and I have deleted the corresponding faces. Then I refined mesh and so it should work now.

    image

    Is there a particular reason you want to use FDTD here?

    Best regards,
    Torben

  • Shan25_22239
    Shan25_22239 Altair Community Member
    edited March 2023

    Thanks Torban! This is very helpful. Due to 18 um thickness the MoM solver was very time consuming, so wanted to use FDTD to solve over a band of frequencies. With your suggestion the MoM solver is now considerably faster. 

     

      

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