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Multilayered structure CMA

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hi! I am simulating multilayered antenna structure, but I not getting accurate modes. I have simulated this antenna using Infinite Ground plane condition but now I want to resimulate it using actual ground plane, I have attached screenshot of the modes and design with a triangular top structure. Can anyone guide me through what mistake I have been doing . One moderator asked me to change meshing, I did that but its of no use because I am getting similar results 

Meshing.png

Design actual - Copy.cfx

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13 minutes ago, Peter Futter said:

It is difficult to say, you may need to try different approaches. You can also try using a finer frequency sampling or a combination of both.  

I have tried combination, defined local mesh along with fine meshing. Actually it takes a lot of time for simulation due to large ground. I want to see the difference with infinite and actual large ground. I am getting different results in CST thats why I want to simulate complete design in FEKO so that I can be sure I am doing it right 

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