\documentclass{article}

\usepackage{pgfplots}

\pgfplotsset{
  compat=1.10,
}
\usepgfplotslibrary{%
  units,
  polar,
}


\begin{document}
\fboxsep=0pt
\fbox{%
\begin{tikzpicture}
  \begin{polaraxis}[
    xmin=-180,xmax=180,
]
    \addplot coordinates {(0,1) (90,1) (180,1) (270,1) (360,1)};
  \end{polaraxis}
\end{tikzpicture}%
}

\end{document}
