RF tutorials

Practical RF guides on S-parameters, Smith charts, impedance matching and measurement, written from handset RF experience.

• How to Open an S2P (Touchstone) File: 6 Ways and a Free Viewer

  An S2P file is a plain-text Touchstone file holding the two-port S-parameters of a device at many frequencies. You can plot it right here in your browser (the file never leaves your computer), read it in a text editor, or open it in RF View, Python, MATLAB or a spreadsheet.

  Updated 2026-10-13