% Author: Dr. Matthias Jung, DL9MJ
% Year: 2020
\begin{circuitikz}
    \draw[-Triangle](0,0) -- (5.0,0.0) 
        node[anchor=north east] () {$f$};
    \draw[-Triangle](0.0,0.0) -- (0.0,3.0)
        node[rotate=90, anchor=south east] () {Leistung};

    \draw(2.5,0) node[anchor=north] () {30\,MHz};

    \draw[rounded corners=3mm, thick, black] 
    (0,0) --
    ++(2.7,0) --
    ++(0.6,2.5) --
    ++(1.5,0);

    \draw [dashed] (2.5,0) -- ++(0,3);
\end{circuitikz}