[SI-LIST] Re: 20H Rule theoretically investigated with simulation.
- From: "Doug McKean" <dmckean@xxxxxxxxxxxxxxx>
- To: "SI-List Discussion Group" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 9 Oct 2002 15:41:47 -0700
You're absolutely correct. It's my emi mode of thinking that
says as long as some antenna construction (however efficient
it is) is giving the headache, that's an effective antenna in terms
of radiated emi.
And I have had to work with a card which did give me problems
thru some complex transfer impedance coupling between the edge
of the card and the chassis cover radiated like mad.
Regards, Doug McKean
----- Original Message -----
From: "Franz Gisin" <franz.gisin@xxxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Cc: <dmckean@xxxxxxxxxxxxxxx>; <zptanner@xxxxxxxx>
Sent: Wednesday, October 09, 2002 2:53 PM
Subject: RE: [SI-LIST] 20H Rule theoretically investigated with simulation.
> Hello Everyone;
>
> As one of the authors of the referenced paper, I think the order of the
> words is reversed. It should be: turning an "ineffective" slot antenna
into
> an "effective" patch antenna.
>
> Having said that, one should also not loose sight of the fact that a patch
> antenna consists of more than just the edge cross section (just because
dogs
> and cats both have four legs does not mean dogs = cats).
>
> In a typical installation, the edge of a PCB often gets inserted into a
> metal card guide - which has a tendency to turn the "slot antenna" cross
> section back into a weird (e.g. not very well behaved) leaky transmission
> line structure.
>
> Franz Gisin
> Director
> Backplane Design Technology
> Signal Integrity Design
> Sanmina-SCI
> 2000 Ringwood Avenue
> San Jose, CA 95131
> Tel: (408) 904-2105
> Fax: (408) 904-2095
> Cell: (408) 314-9644
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Doug McKean
> Sent: Wednesday, October 09, 2002 11:17 AM
> To: SI-List Discussion Group
> Subject: [SI-LIST] 20H Rule theoretically investigated with simulation.
>
>
>
> http://www.scvemc.org/scvemc/may_ieee_emc_2000s.pdf
>
> Essentially, the 20H Rule can be thought of as turning an
> effective slot antenna into an ineffective patch antenna.
>
> Comments?
>
> Regards, Doug McKean
>
>
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