S-Parameter Viewer

A cross-platform S-parameter Viewer written in Python.

Main Features

• Visualize touchstone and Citi files, including those inside of .zip-files.
• Various flexible ways of displaying S-parameters, e.g. IL (all/reciprocal) only / RL only, linear/dB/Smith-chart/re-im, impulse/step response, Phase (normal/unwrapped), Group Delay.
• Plotting of Python-based expressions, including functions for stability factors and stability circles, for adding passive elements, checking for passivity/reciprocity/losslessness.
  • to learn more about this feature see here.
• Viewing data in various table formats (e.g. dB, linear, real/imaginary, phase).
• Export data to .csv or .xlsx, copy data as Python code, save plots as images.

Documentation

See here.

Roadmap

Missing Features

• GUI:
  • Add "color by command", where each "plot()" statement gets its own color assinged.
  • Find a way to present the large matrix in a bigger form, e.g. as a dialog.
  • For the documentations, find a nicer representation than plain markdown files.
• Expressions:
  • Review the examples for the map() function, I think they do not work. Is the map() function really intuitive to use?
  • f_arg parameter for SParams.map().
  • Add more metadata to each SParams object, so I can track the origin (file, parameter, equstion) separately; then I could add a function to e.g. define the color by origin file.
  • Function to set plot type (i.e. when I run that equation, it automatically sets up the plot type).
• Networks:
  • Mixed-mode S-parameter sample file (e.g. Touchstone 2.0 format).
  • Show correct parameter names of mixed-mode parameters in Networks.s(), and in the GUI.
• General:
  • "TODO"-comments in code.
  • More unit tests.

Known Issues

• The Smith chart is based on Scikit RF, and behaves a bit different from other plots, e.g. it will always display the grid, regardless of whether "Show Grid" is selected or not.