\documentclass{article}
% translate with >> pdflatex -shell-escape <file>

% This file is used as unit test for pgfplots, copyright by Christian Feuersaenger.
% 
% See
%   http://pgfplots.sourceforge.net/pgfplots.pdf
% for pgfplots.
%
% Any required input files (for <plot table> or <plot file> or the table package) can be downloaded
% at
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/
% and
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/plotdata/

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\pagestyle{empty}

\usepgfplotslibrary{smithchart}

\begin{document}

\begin{tikzpicture}
	\begin{smithchartaxis}[
		width=10cm,
		height=10cm,
		xmin=0,xmax=5,
		ymin=-50,ymax=50,
		xtick={0.2,0.5,1,2,5},
		ytick={
			 0.2, 0.5, 1, 2, 5,
			-0.2,-0.5,-1,-2,-5},
		ygrid each nth passes x={1,2,5},
	]
	\addplot+[mark=none,is smithchart cs] file {plotdata/smithchart_data.dat};
	\addlegendentry{Data}
	\end{smithchartaxis}
\end{tikzpicture}
\end{document}
