To all interested parties: In recent threads a paper by R. Dockey was recommended as light reading. Unfortunately due to copyright reasons this paper cannot be made freely available. However, the basis of that paper - Asymmetrical Mode Radiation from MultiLayer Printed Circuit Boards - has no such restrictions and it can be downloaded from the RMCEMC website http://www.ieee.org/rmcemc .
This paper demonstrates that a simple trace over a ground plane can produce emissions that fail the FCC Class B specifications. This paper was originally offered as a way to measure emissions. The purpose of this was to answer the question: "I welcome measurements from others that supports the statement that traces over planes are significant sources of EMI. So far, no one has presented such evidence. Lacking such evidence, how can anyone make such claims?" and to offer a measurement methodology.This paper shows that changes in the dimensions of the structure can and will affect the emissions profile. Enjoy... Charles Grasso RMCEMC - Chair. This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
