Re: Dr Howard Johnson, this weeks guest on The Amp Hour

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#354

From: MarkK
Date: Sat, 14 Jan 2012 04:22

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> >
> >A track across a slit is an antenna. Unless there's another plane
> >underneath covering the slit, in which case it probably doesn't
> >matter.
>
> On a multilyer board, there usually is. But I've done test slits on
> microstrips on 2-sided boards, clear across the board, and not much
> happens. I didn't measure radiated EMI, but signal integrity wasn't
> much affected at 30 ps risetimes.
>
> John
>
>
>

right,  just like a coax cable, a disruption of the shield  won't make a
difference to the signal integrity to one signal in the cable

 but can still make a big difference to the shielding effectiveness or
transfer impedance and therefore crosstalk between traces.

If you run TWO traces over the  gap in the plane, the coupling between the
traces will be increased dramatically.

Mark

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From: "MarkK" <makolber@yahoo.com>
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: Dr Howard Johnson, this weeks guest on The Amp Hour
Date: Fri, 13 Jan 2012 23:22:20 -0500
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