Dear Colleagues, Community
can anyone help me for my Problem. I have a design of a microstrip line from Ansys HFSS and i did import it to cst studio and i want to define the ports in cst studio with the discrete port between 50-450 Ghz to get the S-parameters at the end. And i see that i get wrong results for the S11 and S21, i dont know why because I already used the wave guide-port both sides and that was also wrong. here below are some photos.
The impedance of microstrip is affected by fields above the top line, as well as several line-widths or substrate thicknesses each side, so you need to make your port big enough if the port impedance is to be the same as the impedance of the microstrip. A discrete port will not be a very good match to the microstrip you show, I think. A waveguide port with a port 3 times the height of the substrate and 6 times as wide as the line or the substrate thickness should get the right impedance. It doesn't take long to check. CST has the option in the simulation window to just calculate the port modes, so you can change the size and see what happens. The port modes are in 2D results and can be plotted. If the fields are significant near the open port edges then the port is too small.
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