Is the Eigenmode solver in MODE solution capable of simulating metallic waveguides at all? The modeling file is attached to this topic (Mode loss.lms). I’ve measured the power loss per meter for the fundamental EH11 mode in a circular waveguide with the radius of 1mm based on the table below for different material (n=n1+in2). It seems the solver works for the dielectrics but not suitable for the metals.
Mode loss.lms (296.1 KB)