add vipec

ViPEC is a powerful tool for the analysis of high frequency, linear electrical networks

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+ViPEC is a powerful tool for the analysis of high frequency, linear
+electrical networks. It takes a schematic description of the electrical
+network and performs a linear analysis in the frequency domain. The output
+is in the form of port parameters (S, Y or Z) with results presented on a
+user defined grid, Smithchart or table. It can also be used to compute
+other characteristics like stability factors and group delay.
+
+ViPEC supports various lumped elements (capacitors, resistors etc.) as well
+as distributed networks like transmission lines, microstrip and stripline
+structures. Two port data files are also supported (e.g. the 2-port frequency
+parameters of various RF transistors as supplied by the manufacturer). The
+component library is under constant development with new elements added at
+regular intervals.
+
+WWW: http://vipec.sourceforge.net/