In CST MWS, boundaries are defined according to the edges of the geometry to be simulated. However, this geometry is too large to be calculated (hundreds of wavelengths) with a large number of unnecessary mesh cells. To address this issue, I would like to minimize the boundaries by defining them along the coordinate axes. Do you have any ideas on how to solve this problem?
You can make your boundaries as close together as you like by not modelling things outside them, but if things that affect the answer are outside the boundary then unless you are good at guessing their effect you will get the wrong answer.
If the problem is inside a large block of material, and the boundaries of the material are far enough away not to affect the answer, then you can choose the background as that material and only model the small volume with other materials in it, and any background material that is in that solution volume.
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