[Tex/LaTex] Adjust minipage height with \adjustbox

adjustboxminipage

I want to align three images like this, only specifying the total height, like this:

 ______   _________
|      | |         |
|      | |         |
|      | |_________|
|      |  _________
|      | |         |
|______| |_________|

This is what I tried so far:

\documentclass{standalone}
\usepackage{graphicx}
\usepackage{adjustbox}
\begin{document}
\includegraphics[height=10cm]{img/detectors-field.pdf}%
\adjustbox{height=10cm}{%
    \begin{minipage}{10cm}%
        \includegraphics[width=10cm]{img/coax_pic.jpg} \\
        \includegraphics[width=10cm]{img/bege_pic.jpg}%
    \end{minipage}%
}%
\end{document}

But I get this result:

bad-result

Why doesn't \adjustbox work in this case? What's the correct way to achieve the positioning I want?

Best Answer

After some clarification by the OP, I have revised my answer to suit.

The syntax is

\makecomposite{<left-img>}{<top-right-img>}{<bottom-right-img>}{<composite-height>}

The MWE:

\documentclass{article}
\usepackage{graphicx}
\usepackage{stackengine,scalerel}
\newcommand\makecomposite[4]{%
  \savestack\imgstack{\stackengine{0pt}{\includegraphics[width=1in]{#3}}
        {\belowbaseline[0pt]{\includegraphics[width=1in]{#2}}}
        {O}{l}{F}{F}{S}}%
  \savestack\imgcomposite{\scalerel{\includegraphics{#1}}{\imgstack}}%
  \scaleto{\imgcomposite}{#4}
}
\parskip 1em
\begin{document}
\makecomposite{example-image-a}{example-image-b}{example-image-10x16}{5cm}

\makecomposite{example-image-a}{example-image-b}{example-image-golden}{3cm}

\makecomposite{example-image-a}{example-image-b}{example-image-c}{3cm}
\end{document}

enter image description here