>From vague memory... there was some work done by Don White (?) that shows tables of this type of improvement. Full of practical data and information.
- Robert - On Mon, 17 Nov 2003 15:21:54 -0000 "Jeff Chambers" <j.chamb...@ndirect.co.uk> wrote: > > I have been asked to comment on what improvement might > be expected in > changing the design of an equipment lid from: > > A flat lid sat on the edges of the box, where the gaps > between fasteners can > be modelled as a simple aperture, where the attenuation > decreases linearly > with log(f) to zero at a half wavelength. > > To: > A stepped lid, with the lid sat on the edges, and with > the projection > extending below the inner edge of the box.This removes > the 'line of sight' > gap into the enclosure. Does this improve the > attenuation? Intuitively it > should, but if the leakage occurs because of the > interruption in shielding > conductivity and hence current flow at the seam, it > won't. > > Does anybody have any references to analyses of the > above, or comments, > please? > > (No emi gaskets are used btw). > > Thanks, Jeff Chambers > > > Dr Jeff Chambers > Westbay Technology Ltd > Main St > Baycliff > Ulverston > Cumbria LA12 9RN > England > Tel: 01229 869 108 > Fax: 01229 869 108 > http://www.westbay.ndirect.co.uk > > > > ------------------------------------------- > 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: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: emc_p...@symbol.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > 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 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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