[SI-LIST] Re: Help Explaining Microstrip
- From: "Mark Randol" <Mark.Randol@xxxxxxxxxx>
- To: <levinpa@xxxxxxxxxxxxx>, "SI-LIST Reflector" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 17 Oct 2007 15:27:55 -0700
The currents try to find the lowest impedance to travel through the
transmission line (proof that Nature is 'lazy'). The lowest inductance
is obtained by traveling on the inside of the track. (the inside track,
you might say) The highest capacitance is also obtained by traveling on
the inside, which also lowers the impedance.
If you want to look at it from an EM perspective, the fields are
concentrated *mostly* between the conductors, so the current is as well.
The two hunks of copper don't separate because the repulsive forces are
MUCH less than the adhesion to the substrate. =20
If you want to see a case where this is NOT true, I suggest you look
into induction heating for heat treating machined parts. I saw those
machines in action during a short stint in the automotive industry.
Those are impressive demonstrations of all those principles.
http://en.wikipedia.org/wiki/Induction_heating
--
Mark Randol, RF Evaluation & Application Engineer
ON Semiconductor
901 S. Mopac Expressway
Barton Oaks 4, Suite 343
Austin, TX 78746
512-329-5640 (voice), 512-329-8151 (FAX)
=20
=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=20
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Paul Levin
> Sent: Wednesday, October 17, 2007 3:44 PM
> To: SI-LIST Reflector
> Subject: [SI-LIST] Help Explaining Microstrip
>=20
> What is the force that overcomes Oersted and Ampere and=20
> causes the trace and return currents to be so heavily=20
> attracted to each other?
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