RE: [SI-LIST] : Re: Antenna Problem on the Board

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From: Mary (mary@advocate.net)
Date: Sat Jun 02 2001 - 15:20:38 PDT


Be careful how you mix quantum and classical EM theory.
Using this line of reasoning, we would expect a loop
of wire carrying DC current to radiate.

Radiation from right-angle bends is insignificant
relative to radiation directly from the straight
sections of a microstrip line even at microwave
frequencies. Reflections can be a problem in some
microwave applications, but I doubt that they have
a noticeable impact on digital signal integrity, even
at gigabit per second data rates.

Mary

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Doug McKean
Sent: Friday, June 01, 2001 10:57 AM
To: Signal Integrity
Subject: Re: [SI-LIST] : Re: Antenna Problem on the Board

Prasad,

Yes, and thanks. Again, this is only my opinion.

When you apply the vector definition of acceleration to
include directional change of a vector field such as an
electric or magnetic field, then you should get emission.

Aside from all this theoretical talk, how this results in
actual practice, I haven't seen an increase in emissions
to be significant.

Now, concerning bends in traces with regard to crosstalk,
I think I can say there is concern.

- Doug McKean

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