On Aug 27, 11:25*am, qrk wrote:
On Tue, 26 Aug 2008 11:02:15 -0700 (PDT), Wimpie
wrote:



On 26 ago, 19:38, qrk wrote:
On Tue, 26 Aug 2008 10:02:47 -0700 (PDT), Wimpie
wrote:

Hello,

Most formulas for microstrip transmission line assume that there is
dielectric all over the ground plane.

Does somebody know a formula (or graphical solution) for the
characteristic impedance of a microstrip where there is only
dielectric material under the strip (so you can see the ground
plane)?

Best regards,

Wim
PA3DJS
www.tetech.nl
The mail address is valid when you remove abc

http://atlc.sourceforge.net/
The above link is a wonderful arbitrary solver for transmission lines.
This is primarily a Unix program. If you need a Windows build of the
program, I probably have version 4.4 somewhere.

--
Mark

Hello Mark,

This is good one (I found it via google also). You can enter both
metallics and dielectrics as you want. *It would be very nice when you
can mail me a Windows Build (I hope it is not that big). *A link would
also be useful.

My address is valid when you remove abc.

Best regards and thanks,

Wim
PA3DJS
www.tetech.nl

I will keep this on the web site for a few days. About 3MB download.http://qrkwiggles.googlepages.com/atlc-4.4.4_Win32.zip

This version has problems with muliple dielectrics. I works fine with
two dielectrics, air and one of your choosing.

--
Mark

The version I have, which I sent to Wim, is 4.6.0. I'm not sure about
the differences, but if anyone is interested, I have it in a zip file
I can send. The zip file is encrypted, so it will pass through at
least some of the email filters that take out executables or zips with
embedded executables; I'll supply the password of course (just my
call...).

Cheers,
Tom