Vijay, The relative proportions are a function of frequency and the relative conductivity and relative permittivity of the material.
The attached file is from a MathCAD 7.0 model that I put together a while back. The equations came from a Technit design guide published about 20 years ago. You will note that in the frequency range that we usually worry about almost any metal you might use is overkill. It is the apertures that create the problems. The example in the document is copper. I hope this helps. Ghery Pettit, NCE -----Original Message----- From: Wani, Vijay (V) [mailto:vw...@dow.com] Sent: Friday, November 09, 2001 7:36 AM To: 'emc-p...@majordomo.ieee.org'; 'si-l...@freelists.org' Subject: emi shielding hello: as we know, threre are two main component of shielding effectiveness. (Absorbtion and Reflection). is there any way to find out.. what percentage of overall shielding is due to absorbtion / reflection for a given material? thank you in advance. Vijay Wani Dow Chemical ------------------------------------------- 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: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-requ...@freelists.org with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: http://www.freelists.org/webpage/si-list For help: si-list-requ...@freelists.org with 'help' in the Subject field List archives are viewable at: http://www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu
