SPChart is free software to plot S-paramters. The motivation of developing this software is that I cannot find a free tools to do such things.
SPchart is still under developing and now it has such features:
SPChart is base on Python, Numpy and Matplotlib. It is also compiled to exe file by py2exe and packaged to a insaller by Inno Setup.
If you want run SPChart as python script, please install python, numpy and matplotlib first, I recommand to use Python(x,y) package with everthing together. Otherwise, you can use compiled exe format without any libarays pre-installed.
SPChart was developed and tested on Windows XP platform only.
SPview is commercial(not-free) software, can be use to compare with SPChart. Sample S4P file download.
Plot the magnitude in dB:
Caculate from single-ended s-paramters, plot the magnitude in dB: