If you scale all the dimensions of any TEM line, the impedance will
stay the same.

Also, I have an Excel spreadsheet that lets you find impedances (a
free download but I don't have the URL handy...), and there are
several stripline/microstrip applets on the web...should be easy to
find with a Google search. Perhaps the best answer is to use the
transmission line calculator in RFSim99, which is free and does a
whole lot more than just transmission lines.

Cheers,
Tom


"zindazenda" wrote in message ...
ok..i know the width of track for 50r pcb stripline using standard 1/16in
fibreglass pcb is 2.8mm but howabout 1/8in pcb???
or does anyone have programe that works this out? (for dos/windows .)
reason for asking making high power swr meter and i have a large sheet of
1/8 in pcb i need to use....

g0zen.
simon