Frank,
Try the National Semiconductor web site. They provide free slide rule type calculators for transmission line calculations including edge coupled. Also, if you have the cash to spend, Polar Instruments has software that will do the same.

Rick

-----Original Message-----
From: F. D. Bossert [mailto:[log in to unmask]]
Sent: Wednesday, October 06, 1999 10:09 AM
To: [log in to unmask]
Subject: [TN] Impedance Calculation


Sirs,
     Does anyone have a impedance formula for "Edge coupled surface microstrip"?

Any help would be appriciated.

Thanks

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