Re: [SI-LIST] : Cable Shield Coverage

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From: Vinu Arumugham (vinu@cisco.com)
Date: Fri Jul 21 2000 - 09:17:51 PDT


Peter Baxter wrote:

> Hi,
>
> Most round coaxial cables have 100% shield coverage to reduce EMI. The
> shield also carries the return current.
>
> Now imagine a flat ribbon cable with 3V 100MHz digital signals going
> down. The cable is organised ground/signal/ground.
>
> Wrapped around the flat ribbon cable is a "faraday cage" shield. Is is
> grounded to mains earth, at one end only. No digital signal current
> flows through it.
>

How is this ensured?

>
> Can this faraday cage shield have, say 80% coverage, (crosshatch,
> interwoven) and still contain RF emissions, or will is effectiveness be
> reduced dramatically?
>
> Thanks
>
> Peter Baxter
>
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