Thank you for responding me.
The images and their order I attached below.
Firstly, I simulated with the schematic design. The desired frequency is 5 GHz. In the picture below, the parameters of each microstrip line have been optimized to produce a S11 dip at 5.0 GHz. You can see the performance at the second image.
In the 3rd image, I tried to use the Nexxim coupler component as described at the end of Lesson 2.
After importing the same values as the schematic design and run the Analysis, I obtained this message.
Also, the S-parameter with Nexxim coupler is in the last image, which is not centered at 5.0 GHz
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