% Author: Prof. Dr. Matthias Jung und Michael Groni
% Year: 2024
\begin{tikzpicture}
   \begin{polaraxis}[
       rotate=-90,
       hide axis=true,
       scale only axis,
       width=\linewidth*\getDarcImageFactor,
   ]
   \draw [very thick] (rel axis cs:0,0.5) coordinate(top) -- (rel axis cs:180,0.5) coordinate(bottom); % Dipol
   \addplot[domain=0:360, samples=361, mark=none] {abs(((cos(deg(0.5*pi*cos(x)))/sin(x)))}; % Feldstärke
   \node (boundingA) at (axis cs:90,1) {};
   \node (boundingB) at (axis cs:270,1) {};
   \end{polaraxis}

   \pgfresetboundingbox;
   \useasboundingbox (boundingA|-top) rectangle (boundingB|-bottom);
\end{tikzpicture}