From: Bob Lewandowski (Bob.Lewandowski@Vixel.com)
Date: Fri Jan 19 2001 - 18:58:11 PST
CPW can have some bizarre mode problems that are not intuitive. Particularly,
large multilayer structures. What's ground, and what's not is frequently the
issue. Also getting a clean, mode free, launch is a bigger problem then with
microstrip or stripline. Dimensional tolerances are much tighter also. We did
it with thin film on ceramic.
The old software that I used along time ago (equation based) left a lot to be
desired. Cut and try was the order of the day. New 3D solvers should help a
Chris Padilla wrote:
> In my young career as an EMI engineer, I have never seen anyone use CPW or
> CPS. These waveguides seem mostly reserved for and used by the microwave
> community. Is there any good common literature out there on the web
> somewhere regarding these seemingly little used waveguides? We have tons
> and tons of stuff on microstrips and striplines (and the slight variations
> of those) but I don't see much on the CPW or CPS. CPS = coplanar striplines
> >Another solution which works quite well is to use CPW or
> >grounded CPW construction for diff pairs on outer layers.
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