Hi freqzt,
Thanks for your reply. Now I have some questions:
1. Did u use my model to simulate (with all the dimensions as in the model).
2. What is the dimension of the coaxial u used (inner, outer, material of the dielectric...). In the model I had the dielectric of the coaxial but its material is the same as the substrate and they are added together in CST. As u said, I have to construct the outer conductor, I will try it.
3. What do u mean CST Microstipes. does it belong to the CST family?
Anyway thanks u so much.