[SI-LIST] Serpentine/Spiral Lines (was Re: Trace Bends)

This is slightly off-topic of trace bends but one of the main reasons some 
of us worry about trace bend is they are chiefly used to create time 
delays.  This method is known as "serpentining."

There was a paper presented at the 16th Annual Applied Computational 
Electromagetics symposium presented at the Naval Postgraduate School in 
Monterey, CA from March 20-24, 2000.

"FDTD Analysis of Conventional and Novel Delay Lines" by Omar M. Ramahi (he 
is the co-author of a great little handbook: "EMI/EMC Computational 
Modeling Handbook")  Try him at Omar.Ramahi@xxxxxxxxxx but I've no clue if 
that email address is still viable...I have my doubts! :|

Basically, the paper talks about delay lines and minimizing crosstalk while 
maintaining the same spacing and density of the serpentined line.  The 
conclusion is to use a spiral method of delay line.  This is difficult to 
describe without a picture, unfortunately.

Being an EMI Engineer, I wonder about the EMI radiation from such a 
structure as a whole rather than just the many 90-degree bends present!

Two references were sited:

R-B. Wu and F-L. Chao, Laddering wave in serpentine delay line, IEEE Trans. 
Components, Packaging and Manufacturing Tech., Part B: Advanced Packaging 
vol. 18, no. 4, pp. 644-650, Nov. 1995.

R-B. Wu and F-L. Chao, Flat spiral delay line design with minimum crosstalk 
penalty, IEEE Trans. Components, Packaging and Manufacturing Tech., Part B: 
Advanced Packaging vol. 19, no. 2, pp. 397-402, May 1996.

Thanks----->Chris


>As a follow-up to this subject, there was a paper
>presented at the Denver EMC symposium
>(1998 I believe) which stated a *lowering* of
>emissions from serpentine construction of traces.
>Can't remember who presented it nor what
>speed of signals were involved.
>
>Regards, Doug McKean

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