RF tutorials
Practical RF guides on S-parameters, Smith charts, impedance matching and measurement, written from handset RF experience.
- How to Read One Line of an S2P File (MA, DB and RI Formats)2026-10-14A two-port S2P data line holds nine numbers: the frequency, then the pairs for S11, S21, S12 and S22 in that order. The option line tells you whether each pair is MA, DB or RI, and a magnitude of 0.9975 is about -0.022 dB.
- How to Open an S2P (Touchstone) File: 6 Ways and a Free Viewer2026-10-13An 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.