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Strange pattern within modes
Posted 1 feb 2024, 05:22 GMT-5 3 Replies
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Hi,
I am simulatimg a fundamental WG with some curves. Since WG is operated in its fundamental band, no mode significant conversion or reflection is present ( coefficients below -50 dB). So I expect to see a very clean TE10 ( input mode) propagating in the WG, expect for the attenuation given by Ohmic losses ( copper walls ). The problem is that I see some strange structures inside the maximum and the minimum of the propagating TE10 ( you find a picture in attachment). Do you think these structures are significant or could they be given by numerical errors? Do you think I need to refine the mesh ?
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It does look like your mesh is too coarse.
Jeff
-------------------Jeff Hiller
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Hi, I tried to use the "extremely fine" mesh in the physics-controlled mesh option but the pattern is still identical, why?
thanks in advance
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My guess is that the "extremely fine" setting results in a mesh that, its name notwithstanding, is too coarse to capture the solution. I figure from your screenshot that there may only be ~3 elements across that waveguide. If I am right about that, you will need to use more subtle ways of specifying your mesh than a global setting. The chapter on meshing in the Reference Manual contains valuable advice and examples. For this particular analysis, you may want to consider using a swept mesh for the waveguide, see this blog post on swept meshes.
Jeff
-------------------Jeff Hiller