I'm setting up an S-Parameter test on a transmission line, but I want the electrical length to change and depend on the frequency. How can I go about that? The variables that I can put in are all constant-I can't figure out how to make non-constant variables. I also tried putting in a sweep plan, but I can't figure out how to use it as a variable in the transmission line.
This effect is called dispersion, and ADS is able to model it. However, you might have trouble with it. The way that dispersion works is limited by the laws of physics, and the ADS simulator attempts to obey these laws. The consequence is that electrical length versus frequency cannot change in an arbitrary way. Using ADS for this type of analysis requires an understanding of dispersion and how it is constrained. This is an advanced topic. Start with the Kirschning and Jansen formula.