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John1989

Phase difference between MOM and FEM solution

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Hello,
I have to characterize a dielectric material. I need to calculate the scattering parameters of the rectangular waveguide with inside it the dielectric to be characterized.
Resolving both with the MOM and then subsequently with the FEM I have a correspondence on everything, except on the S21 phase.
Who can tell me why?
Thank you.

S21_PHASE_MOM_E_FEM_FINE.png

FEM_FINE.cfx

MOM_FINE.cfx

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Hi John1989

 

The reference direction for the ports are different. This causes the 180 degree phase shift.

You can change it for the MoM port as shown.

ref_dir.png

For the FEM port, it cannot be set, and is assigned automatically internally.

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