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[TowerTalk] microstrip transmission lines

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Subject: [TowerTalk] microstrip transmission lines
From: (John Brosnahan)
Date: Thu, 12 Feb 1998 19:16:46 -0700 (MST)
I am looking for a formula for calculating the impedance of
a microstrip transmission line in an arrangement that does 
not seem to be covered by any of my references.

I only need moderate accuracy through the VHF bands so 
some of the more esoteric terms are probably not required.

The configuration is that of a single sided (ie, no pcb ground
plane) G-10 circuit board with the transmission line trace 
etched on the side towards the grounded chassis and with 
an air gap between the trace and the chassis ("ground").

Primary variables are of course the 1) trace width and
2) the height above the ground plane with air for the dielectric 
on one side and 3) the thickness of the G-10 pcb on the 
"back side" (and then more air), and 4) the copper trace 

If anyone has any good references on this configuration
or a formula I would certainly appreciate it.

Thanks in advance for any help.

John Brosnahan    W0UN

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