I just posted suggesting that z0=60*cosh^-1(2h/pi*d) might be the exact
formula for the impedance. That is clearly wrong; don't use it.

Cheers,
Tom


K7ITM wrote:
What shape is the conductor? If it is a rectangular cross-section, do
a search on the web for "stripline impedance formula" and you should
find what you are looking for. If it's a round wire, diameter d and
symmetrically spaced between two grounded plates separated by h, and if
d .75h, to a reasonable approximation,

Z0 = 60*ln(4h/pi*d)

(per "Reference Data for Engineers"; my suspicion is that Z0 =
60*cosh^-1(2h/pi*d) is exact for lossless line, but I won't try to
prove it at the moment.) Divide by sqrt(relative dielectric constant)
if the dielectric isn't air or vacuum.

Cheers,
Tom

kretko wrote:
Hello !

Im looking for a formula impedance of conductor between two ground plane.

_________
*
h1
*
p
*
h2
*
_________

p -conductor
h1 = h2

Thank you for your help !

Goodlack ! ! !