" inhomogeneous port will cause hybrid mode in CST &quo

Hi all friend,

One problem put me on edge for a couple days.

I am using CST to simulat ethe Coplanar Waveguide. The basic on,
dielectric material with constant 9.6 and 350um thickness, 70um copper, strip width 350um & gap 250 gap.

input frequency 1-5G
background material air, big
waveguide port according to the instruction, ( i tried a lot of types)

when I run, hint the port is inhomogeneous, mode is hybrid. Hence the upshot is mode is TE or TM, big loss than
reality. AWK, CPW has QTEM. Hence there is no line impedance, wave impedance is huge.

Actually, i failed to fulfill the simulation.

I leave no stone unturned to solve it. like Make mesh finer, change the port size, in a word, I can not get TEM.

Could you help me out?

Appreciate your attention first.

Waiting for your response.