The Port Sweep Settings section in the Electromagnetic Waves interface describes how to cycle through the ports, compute the entire S-matrix and export it to a Touchstone file.

The Frequency Domain Source Sweep study is another way of making efficient port sweeps. It is available as a preset study for the Electromagnetic Waves, Frequency Domain interface.

Exporting a Touchstone file can also be performed by right-clicking the Export node under Results and selecting Touchstone or by selecting Touchstone under Data in the Results ribbon toolbar (Windows users) or the Results context menu (Mac and Linux users).