[SI-LIST] Re: Help Explaining Microstrip
- From: "Jack Olson" <pcbjack@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 23 Oct 2007 13:31:20 -0500
If you are trying to explain transmission line theory
to non-engineers, I don't think it would help to know
much about Oersted, or the principle you state.
Stick to "Like charges repel, and opposites attract"
and you may avoid that glazed look in their eyes...
(unless you were just asking for yourself)
onward thru the fog,
Jack
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Paul Levin
> Sent: Wednesday, October 17, 2007 1:44 PM
> To: SI-LIST Reflector
> Subject: [SI-LIST] Help Explaining Microstrip
>
> Dear SI-LIST'ers,
>
> I'm working on a presentation to explain transmission line to
> non-engineers and I find myself stumbling over some of the basics.
> (There's nothing like explaining something to bring out all of the
> glitches in what you were sure you
> understood!)
> I'm hoping that one of you may be able to supply the missing link.
>
> Nearly two hundred years ago Oersted and Ampere figured out that if you
> have two conductors carrying current in the same direction, they would
> would to pull in close to each other whereas if you had two conductors
> carrying current in opposite directions, they would want to separate.
>
> If one were to apply just these observations to microstrip, you would
> expect to see all of the trace current bunched on the side away from the
> ground plane and the return plane current in two bunches to either side
> of the trace and as far away from the trace as possible, if not on the
> bottom.
>
> Of course, this is almost exactly opposite from what we know happens.
>
> What is the force that overcomes Oersted and Ampere and causes the trace
> and return currents to be so heavily attracted to each other?
>
> Thank you in advance.
>
> Regards,
>
> Paul Levin
> Senior Principal Engineer
> Xyratex
>
>
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