waveguide modes tool dieletric material


I am trying to change the dielectric property of my waveguide source using the waveguide tool. Although, whenever I change it from 1 to the value I need and select apply, it switch back to a relative permittivity of 1.
Can you help me to solve this issue?

Thank you

Hi Micol,

Did you model the waveguide filling (where you placed the waveguide source) and set the material parameters of this object correctly in the simulation settings?