\def\d{0.2}
\def\n{3}
\def\nn{2}
\def\a{2.5}

\begin{tikzpicture}[>=stealth', auto, node distance=2cm, scale=1.2]

    \tikzstyle{zero} = [draw, circle, inner sep =0, minimum height=0.15cm]
    \tikzstyle{dot} = [fill, circle, inner sep =0, minimum height=0.1cm]

    \tikzset{pole/.style={cross out, draw, minimum size=(0.15cm-\pgflinewidth), inner sep=0pt, outer sep=0pt}}

    \begin{scope}[xscale=3, yscale=3]

    \begin{scope}[]
        % \onslide<4->{
        \fill[orange!30, scale=1.735] (0,0) rectangle (\d*\a+0.5, \d/\a+0.5);
        % }
        % \onslide<2->{
        \fill[yellow!30] (0,0) rectangle (\d*\a+0.5, \d/\a+0.5);
        % }

        \begin{scope}[]
            \clip(0,0) rectangle (2,1.25);
            \draw[thick, scale=1, domain=0.1:10,  variable=\x, smooth, samples=200] plot ({\d*\x1+0.5}, {\d/\x+0.5});
            \node at(1.25,0.7) {$K + jK^\prime$ Ortskurve};
        \end{scope}

        % \onslide<2->{
        \begin{scope}[blue]
            \draw[] (0,0) rectangle (\d*\a+0.5, \d/\a+0.5);


            \node[pole] at ( \d*\a+0.5, \d/\a+0.5) {};
            \node[zero] at ( \d*\a+0.5, 0) {};

            \draw[] ( \d*\a+0.5,0)  node[anchor=north] {\small $K$};
            \draw[]  (0, \d/\a+0.5)  node[anchor=east]{\small $jK^\prime$};

            % \onslide<3->{

            \foreach \i in {1,...,\nn} {
                \draw[gray, dotted] (\i*\d*\a/\n+\i*0.5/\n, 0) -- (\i*\d*\a/\n+\i*0.5/\n, \d/\a+0.5);
            }

            \node[dot, gray] at (\d*\a/\n+0.5/\n, \d/\a+0.5) {};
            \node[above] at (0.5*\d*\a/\n+0.5*0.5/\n, \d/\a+0.5) {\small $K/N$};
            % }
        \end{scope}
        % }

        % \onslide<4->{
        \begin{scope}[scale=1.735, red]
            \draw (0,0) rectangle (\d*\a/\n+0.5/\n, \d/\a+0.5);
            \draw[gray] (0,0) -- (\d*\a/\n+0.5/\n, \d/\a+0.5);

            \node[pole] at ( \d*\a/\n+0.5/\n, \d/\a+0.5) {};
            \node[zero] at ( \d*\a/\n+0.5/\n, 0) {};


            \draw[] ( \d*\a/\n+0.5/\n,0)  node[anchor=north] {\small $K_1$};
            \draw[]  (0, \d/\a+0.5)  node[anchor=east]{\small $jK_1^\prime$};

        \end{scope}
        % }

        \draw[gray, ->] (0,-0.25) -- (0,1.25) node[anchor=south]{$\mathrm{Im}$};
        \draw[gray, ->] (-0.25,0) -- (2,0) node[anchor=west]{$\mathrm{Re}$};

    \end{scope}

\end{scope}

\end{tikzpicture}