Re: Flat transmission line capacitance formula?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net> 

National Semiconductor has a nifty applications note that gives all the
formulas for microstrip transmission lines (i.e. a rectangular cross section
conductor above a ground plane).

You can try: http://home.earthlink-dot-net/~w6rmk/math/tleqn.htm but I'm not
sure I've got the equations there.

It's a bit tricky because the "fringing effects" are hard to calculate.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, January 11, 2004 12:23 PM
Subject: Flat transmission line capacitance formula?


 > Original poster: Bert Pool <bert.tx-at-prodigy-dot-net>
 >
 > I have formulae for isolated spheres, toroids, flat plate capacitors,
etc.,
 > but do not have a formula for calculating the capacitance of a single,
long
 > flat plate transmission line.  I use a long strip of aluminum flashing for
 > the transmission line from the driver to the extra coil on my
 > magnifier.  Tesla provides us a formula for a cylindrical transmission
 > line, but nowhere do I find a formula for a flat plate line.  Does anyone
 > out there have such a formula?  I will be conducting some measurements on
a
 > real-world line to determine the measured capacitance, but it sure would
be
 > a help if I had a starting formula from which to work!
 >
 > Thanks,
 > Bert Pool
 >
 >