Seems to me that the smallest practical EMC chamber is going to be a TEM Cell...
Regards, -doug From: [email protected] [mailto:[email protected]] On Behalf Of Nagel Michael-amn029 Sent: Wednesday, May 02, 2007 10:40 AM To: [email protected] Subject: RE: Smallest yet Practical EMC Chamber Hello! > What is the smallest chamber size that one can use for making decent RE > (e.g., compliance levels of +/- 6dB in the low range and +/- 4dB in the > upper range to the calculated NSA) and RI measurements in a 3-meter antenna > distance and for a 70 cm3 test/EUT volume? It is difficult to provide a straight answer. You EUT looks relatively small (although the volume by itself can have strange shapes), so let's presume that you EUT is small and battery powered and you weren't aiming for 20GHz, a GTEM cell could do the job up to 1GHz if you stick with IEC 61000-4-20, if the largest dimension of your EUT is less than 6 inches, you can easily go up to 2GHz, more depends on the directivity of your EUT. But you want to go up to 20GHz... > Would you have contact the information for a reasonable source for 10x10x6.7 mm Ferrite Tiles? > The same for the absorber cones; I am aiming to use the chamber up to the 20 GHz. If you want to have a large useful space and good performance, hybrid absorbers seem to be the best solution. Ferrite tiles will work good on the lower frequency ranges, but when it comes to the multiple GHz range, pyramid absorbers have better performance. For the minimum size I cannot tell a number, but if you look into that document from Frankonia: http://www.frankonia-emv.com/data_sheets/shielded_rooms_anechoic_chambers.pdf you might find something useful. Other suppliers like ETS-Lindgren may have similar things. Best regards, Michael Michael Nagel Senior EMC Engineer Motorola GmbH ECC Embedded Communications Computing Lilienthalstrasse 15 85579 Neubiberg/Muenchen - Germany Vorsitzender des Aufsichtsrates: Fred Irwin Geschäftsführung: Roland Duerr, Dr. Christoph Hollemann, Heinrich Korte, Ralf Gerbershagen (Vorsitzender) AG Wiesbaden, HRB 16024 VAT/USt.-ID: DE 113866163 Ph: +49-89-9608-0 Fax: +49-89-9608-2376 e-mail: [email protected] info: http://www.motorola.com/computers - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
