CST ports problem-please help

[carbon9]

Hi,

I just designed a simple microstrip transmission line and modelled it in CST. I attached the CST project. According to the microstrip design, epsilon of the substrate is 4.6, substrate thickness is 1.6mm, and line width is 3mm. I verified these calculations in 2 different plugins.

The problem is, S11 is always around 0dB and S21 is below -25dB. And this doesn't change when I change the width to a value than 3mm. I think the problem is with the ports I used. Could you please help me to modify the project so that it would work as expected?

Thanks in advance...

 

[johnjoe]

You have to place your discrete ports between ground and trace, you connected only one side to your trace and left the other side floating, there is no loop.

 

[carbon9]

Thanks a lot.