\documentclass[a4paper]{jsarticle}
\usepackage{dashrule}

\begin{document}

あ\hdashrule[0.5ex]{3cm}{2pt}{1pt 1pt}ん

あ\hdashrule[0.5ex]{3cm}{1pt}{1pt 1pt}ん

あ\hdashrule[0.5ex]{3cm}{2pt}{2pt 1pt}ん

あ\hdashrule[0.5ex]{3cm}{2pt}{2pt 2pt}ん

\end{document}
