I am having problem with S-parameter simulation of 4 port for tranmission line. I have used "LTLINE2" component as my channel and I want to use this channel later for high-speed SERDES communication with differential TX/RX. But before that I need to know channel characteristics. May be after building a good channel here I can export the s-parameter file and use for other transceiver already built in Cadence. This is just for my basic simulation understanding. I have used controlled impedance line designer to put the line multilayer channel design inside the "LTLINE2" component. Now if I simulate the simulation result is not convincing, the S(2,1) or S(1,2) curves are linear not bumpy. What is wrong with my simulation setup or circuit or any other thing?
I have attached the screenshot of schematic and simulation in the attached file.
You help will be highly appreciated.