Hello, I'm simulating the TEM mode of a simple parallel plate waveguide.It has periodic boundary conditions in x, metallic boundary conditions in y, and propagation vector in z. The propagation direction has PML in front and back.
The attached images show an x-slice of the waveguide, with a strange anomaly near the top left, where the metallic boundary condition, source plane, and PML coincide on a line.
The anomaly appears as the presence of an additional line source along the line where the source plane and the metallic boundary meet. (It doesn't matter which x-slice I present, the anomaly will always appear the same)
This anomaly doesn't die out (compare images for t=200 with t=2000). It's hard to see from the images, but the anomaly seems to make the TEM wave "non-perfect" in the rest of the waveguide.
I also tried using metallic blocks for the parallel plates, instead of setting the High and Low X boundaries to Metallic, but the result was the same.
Is this a bug? Kind Regards, Matt
xslice_t200.png
Description: t200
xslice_t2000.png
Description: t2000
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