# In ADS, how can I change the electrical length on a transmission line to depend on the frequency sweep?

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.

• Thanks for the response. Since the electrical length is $\beta*l$, and $\beta =2\pi/\lambda$ all I'm expecting for is beta to change and thus the electrical length. I wouldn't expect it to be that hard/advanced a topic. – Goldname Feb 19 '17 at 5:13