RE: [SI-LIST] : Slotted ground planes

owsley@us.ibm.com
Mon, 30 Aug 1999 10:45:08 -0400

In general, just say NO to slots. In particular, these take a lot of care and
understanding to use effectively, and then when used correctly, further analysis
shows that they can now be removed with no ill effects. But they are an
interesting exercise, that with enough curiosity, can lead to a greater
understanding of EMI.

Bill Owsley, EMC Engineer
EMC Design - Do It First... Do It Last... But It must be Done...

"Mellitz, Richard" <richard.mellitz@intel.com> on 08/27/99 04:52:20 PM

Please respond to si-list@silab.eng.sun.com

To: "'si-list@silab.eng.sun.com'" <si-list@silab.eng.sun.com>
cc:
Subject: RE: [SI-LIST] : Slotted ground planes

My experience was serendipitous. It just happened in layout with out my
knowledge. The lesson was to avoid it! The slot was open to the surface
with only a FR4 layer above. 'Big EMI hit not to mention signal integrity
degradation.

...Rich

-----Original Message-----
From: Russell Rapport [mailto:rrapport@staktek.com]
Sent: Friday, August 27, 1999 1:13 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Slotted ground planes

Does anyone have experience using slotted ground planes in
which the
slots always run parallel to the signal traces? It would
seem that this
situation would be similar to microstrip along the edge of a
board. What
would be the effect on impedance, crosstalk, and EMI?

**** To unsubscribe from si-list: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list, for more help, put HELP. si-list archives are accessible at
http://www.qsl.net/wb6tpu/si-list ****

**** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In
the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list
archives are accessible at http://www.qsl.net/wb6tpu/si-list ****

**** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****