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Wed, 16 Sep 1998 12:21:47 +1000 |
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On Tue, 15 Sep 1998, Gary Boccoleri wrote:
> Can anyone help me with information on guard banding. I'm talking about
> shielding a trace by circling it with a ground trace. This has come up
> as a way to solve all of our EMI problems. I'm of the opinion that the
> additional spacing it requires is what helps to prevent crosstalk and
> the ground traces just take up space.
>
> If anyone has any opinions on this (pro or con) or can point me at some
> resources on the subject I would appreciate it.
>
> ##############################################################
> Gary Boccoleri Lucent Technologies
> 510-737-2195 Remote Access Business Unit
> 510-737-2110 FAX 4464 Willow Road
> [log in to unmask] Pleasanton, CA 94588-8519
> ##############################################################
>
Gary,
You may wish to have a look at the book "Printed Circuit Board Design
Techniques for EMC Compliance" by Mark I. Montrose, IEEE press 1996. He
has 5 & a half pages on "guard/shunt traces" (Section 4.11, pg 94). He
essentially says that they are useful in 2 layer boards & essentially it
is the extra space that helps you in microstripline or stripline boards.
He says "Guard traces perform best on one- and two-layer boards (i.e.
those without a power or ground plane)."
--
Dom Bragge (VK2YAK) ___ _____ JNA Telecommunications Limited
Senior PWB Designer(R&D)__ / / |/ / _ | 16 Smith St Chatswood NSW 2067
Tel: (+61 2) 9935 5792 / // / / __ | AUSTRALIA [log in to unmask]
Fax: (+61 2) 9417 3862 \___/_/|_/_/ |_| E-:-I http://www.jna.com.au
"In the process of being swallowed up by Lucent"
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