Re: [SI-LIST] : Coplanar Transmission Line

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From: Vinu Arumugham (vinu@cisco.com)
Date: Thu Feb 03 2000 - 13:39:52 PST


This is what I had in mind, a combination of proximity effect and skin effect resulting in more conductor loss.

Vinu

Ray Anderson wrote:

> > Date: Thu, 03 Feb 2000 12:11:54 -0800
> > From: Vinu Arumugham <vinu@cisco.com>
> > X-Accept-Language: en
> > MIME-Version: 1.0
> > To: si-list@silab.eng.sun.com
> > Subject: Re: [SI-LIST] : Coplanar Transmission Line
> > Content-Transfer-Encoding: 7bit
> >
> > Will the skin loss not be higher in CPW than in microstrip/stripline?
> >
> > Vinu
> >
>
> I don't have any numbers or equations to back this up at the moment,
> but it would seem that the skin effect loss would be higher than a
> msl or sl line due to the fact that current crowding would occur to
> cause most of the signal current to flow along the edges of the signal
> line in an attempt to get near the return current in the coplanar ground
> traces. Same thing for the current in the ground traces, it would crowd
> towards the signal line. Since the entire copper surface area isn't being
> used for current flow the losses would increase I think.
>
> Anyone know for sure ??
>
> -Ray
>
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