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Stripline Directional Coupler Software
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Bill VanRemmen, KA2WFJ, describes a stripline directional coupler for VHF/UHF in the February 1997 issue of QST, and has some information about this available on his HAM Radio Web Page. I wanted to be able to run his stripline calculations, but did not have an IBM PC available. So, I simply ported his BASIC code into C.

I've written both a text-based ANSI-C version, and one with an X Windows interface using Motif. The X version uses sliders so that you can play with three parameters (impedance, thickness, dielectric constant) and see what kind of impact each has on the output tracewidth.

I just put this together in an evening, and so it's a little rudimentary. However, I'll keep working on it as I find time, because the next version of this port will allow you to fix any pair of parameters to see how errors in a third affects the fourth. For example, it might be interesting to see how the impedance varies if you fix the thickness and dielectric constant, and vary the tracewidth.


  • Download the stripline.c source code, a direct ANSI-C version of Bill VanRemmen's BASIC software. Should compile on any machine that supports ANSI-C.

  • Download stripline, a binary of the above program compiled under Solaris 2.6

  • Download the xstripline.c (version 0) source code, an X-Windows based version of stripline. Requires Motif.

  • Download xstripline (version 0), a binary of the above program compiled under Solaris 2.6

  • View a screen shot of xstripline (version 0).


This page is maintained by David D.S. Hale. Please send me some feedback. I would appreciate knowing if anyone has found this to be useful.

Last Updated 1998 September 20