Re: [SI-LIST] : What's your favourite Screwy SI Concept?

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From: Bradley S Henson (bhenson@notes.west.raytheon.com)
Date: Fri Jan 14 2000 - 06:42:54 PST


SI'ers,

I know this group has beat this subject to death. I would only suggest another
reference to add to you collection of papers should be : Douville, R.J.P. and
James, D.S., "Experimental Study of Symmetric Microstrip Bends and Their
Compensation," IEEE Transactions on Microwave Theory and Techniques., Vol.
MTT-26, March, 1978. I can't provide copies as I only have an internal company
correspondence that does some local banter and includes the complete reference.
Despite its age, I would expect it to be had in some archives.

I found this quite helpful in forming my own conclusions since it provides some
really good, quantified frequency_domain data.

As always, your mileage may vary.

Enjoy the process,

Brad Henson, Raytheon

Doug McKean <dmckean@corp.auspex.com> on 01/13/2000 05:14:35 PM

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Mitch,

I'm looking at Mr. Brooks well written articles right now.
And Mr. Brooks does an excellent discussion.

What I can't find is an article by a Dr. Bracken (spelling?)
of Ansoft (maybe not there now) who performed a 0.1 volt crosstalk
to 1 volt signal simulation with right angle bends. Dr. Bracken
also discussed a common to differential mode conversion as a
possible mechanism. I also can not seem to locate Mr. Montrose's
article submitted at the Denver EMC Symposium titled "Time and
Frequency Domain Analysis of Right Angle Corners on Printed
Circuit Board Traces."

As far as "disproving" a myth, I'm not so sure yet.
I'll have to see more data.

Doug McKean

cadpro2k@dacafe.com wrote:
>
> Boys, you better read the latest from www.UltraCad.com Doug Brooks (with
> the help of Lee Ritchey, or because of Lee) did some very well defined
> test cases dealing with 90 degree bends, and you might be surprised with
> the findings. I peronally don't do 90 degrees, since I let the
> autorouter miter every trace, but I certainly don't do much clean up
> either if something doesn't look "cosmetically" pretty. ;)
>
> If this data had been done easlier (maybe in the 80's), we all might be
> seeing boards with nothing but 90 degree traces! Enough said. Another
> engineering "myth" disproved. :)
>
> Mitch

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