### Problem with phase accuracy in waveguide polarisers

Posted:

**Sun 14 Jun 2020, 13:01**Does anyone know why it requires an extremely fine mesh to get sensible results when simulating various waveguide polarisers?

I'll post some examples when I get chance bit for square cross section corrugated polarisers I require about 80 to 100 cells per wavelength. For circular cross section waveguide I require over 300 cells per wavelength to get sensible results.

Two orthogonal port modes are being simulated and the S-parameters used to calculate the Axial ratio and differential phase.

This was going to be the basis for a polariser tutorial but the way things are going it wouldn't be practical with such huge meshes. Hope there is a solution to this issue. Thanks.

I'll post some examples when I get chance bit for square cross section corrugated polarisers I require about 80 to 100 cells per wavelength. For circular cross section waveguide I require over 300 cells per wavelength to get sensible results.

Two orthogonal port modes are being simulated and the S-parameters used to calculate the Axial ratio and differential phase.

This was going to be the basis for a polariser tutorial but the way things are going it wouldn't be practical with such huge meshes. Hope there is a solution to this issue. Thanks.