For normal lumped circuits, your favorite version of spice will work fine.

For analyzing matching networks, I've used gsmc.

For analyzing a layout and extracting parasitics and computing fields, I dunno.  It's usually easier to just build the circuit and see what happens.

Free RF Simulation Software
I am trying to use the cases construct within a table. I tried to follow this example. When I copy paste the entire example, it compiles without an error. 

But when I try to reproduce it, I get immediately into trouble:

\documentclass{article}

\begin{document}

\begin{table}
\begin{tabular}{c}
\hline
\[ e \]    \\
\hline
\end{tabular}
\end{table}

\end{document}



  Bad math environment delimiter [ e ].


What am I doing wrong?
