Re: [SI-LIST] : Chassis hole opening and frequencies

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From: Adrian Shiner (adrian.shiner@virgin.net)
Date: Wed Jan 05 2000 - 11:50:13 PST


I expect you have already seen my previous email in reply. It all comes back
to the efficiency which you aim for. It would make sense to avoid holes and
look at narrow various short slots oriented at various angles. Various in
this context equals chaotic..a minor problem for a computer controlled
moulding or punching machine programmer. Note that chaotic is not the same
thing as random (mathematically speaking).

Now if you have a long narrow slot (filled or not with a connector)
surrounded by an array of chaotic slots (as described above), will the
combination attenuate the radiation compared to the slot only??

Adrian

----- Original Message -----
From: Daren McClearnon <darenm@en.com>
To: <si-list@silab.eng.sun.com>
Sent: 05 January 2000 03:54
Subject: Re: [SI-LIST] : Chassis hole opening and frequencies

> At 02:51 PM 1/4/2000 -0700, DC Sessions wrote:
> >Jay Chesavage wrote:
> >>
> >> Is there a class of Chaos theory which has to do with optimizing fixed,
> >> static structures? Sounds more like linear programming to me (explore
> >> state space for minimum radiation at frequency f, where the variable is
> >> hole placement), and then go repeat the process for each and every f,
and
> >> each and every hole placement(!).
> >>
> >
> >You are. Chaos theory has to do with any complex nonlinear progression.
> >Fractals (think Mandelbrot sets) are classic examples of chaos. Looking
> >at it another way, time-variance is generally treated in physics as
> >movement through the (x,y,z,jt) space.
> >
>
> Fractal structures are already used for wider bandwidth antennas, since
> some feature is likely to be resonant over a range of freqs instead of
> of a few specific freqs. The curiosity I have is whether such an
> implementation in a shielding application would:
>
> a) dither out a few emitted peaks so that a wider spectrum is
> below some mask/threshold (noise-like), or,
> b) make the chassis a efficient broadband radiator at many freqs,
> so that a wider spectrum raises to the level of the peaks
> c) eliminate -or- exaggerate spatial directivity?
>
> Daren McClearnon
> Agilent Technologies
> daren_mcclearnon@agilent.com
>
>
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