Re: [SI-LIST] : CPW and CPS

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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
lot.

---Bob Lewandowski
    Vixel Corp.

Chris Padilla wrote:

> Scott,
>
> 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
>
> ----->Chris
>
> >Aubrey,
> >*<snip>*
> >Another solution which works quite well is to use CPW or
> >grounded CPW construction for diff pairs on outer layers.
> >
> >
> >regards,
> >
> >scott
>
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