You might also wish to check out Section 5.3 in "Microwave Engineering
Passive Circuits" by Peter A. Rizzi, 1988, Prentice-Hall. It looks like
Figure 5-12 might be what you are describing and there are accompanying
info and references.
73, Rob
Rob Shapiro - ND3A
Potomac Valley Radio Club
nd3a@worldnet.att.net
----------
> From: Robert Shapiro <nd3a@worldnet.att.net>
> To: towertalk@contesting.com; John Brosnahan <broz@csn.net>
> Subject: Re: [TowerTalk] microstrip transmission lines
To: <towertalk@contesting.com>
> Date: Friday, February 13, 1998 2:58 AM
>
> Hi John. I dug out a textbook I had in school titled "Microwave
> Engineering and Applications" by Om P. Gandhi which shows in Figure 12 a
> wide strip (w/h > 0.1) and narrow strip (w/h < 0.1) plots of
characteristic
> impedance, with multiple plots of varying dielectric constants
> (epsilon-sub-r) from 1 through 90. Table 3.1 in the same book gives
> dielectric constants for various substrate materials. I hope this can be
> of some help.
>
> 73, Rob
>
> Rob Shapiro - ND3A
> Potomac Valley Radio Club
> nd3a@worldnet.att.net
>
> ----------
> > From: John Brosnahan <broz@csn.net>
> > To: towertalk@contesting.com
> > Subject: [TowerTalk] microstrip transmission lines
To: <towertalk@contesting.com>
> > Date: Thursday, February 12, 1998 9:16 PM
> >
> > 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
> > thickness.
> >
> > 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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