Dave, My understanding from your email below is that you modeled a cable in free space all by itself.
Can you change the model to show the effects of a shielded cable running between two chassis? Then change the bond impedance from cable shield to chassis and see what happens? Best regards, Chris Maxwell, Design Engineer | Compliance Engineer Email: [email protected], Desk Phone: 315-266-5128 Engineering Department Fax: 315-797-8024 NetTest (New York) Inc. 6 Rhoads Drive, Building 4, Utica, NY USA Web: www.nettest.com, Phone: 315-797-4449 NetTest, a Member of the Anritsu Group From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, September 19, 2005 12:05 PM To: [email protected]; [email protected] Cc: [email protected] Subject: cable shield simulation For what it's worth I ran a NEC-2 model of a differential transmission line under these conditions: 1) free space 2) covered with a mesh shield open at each end 3) covered with a mesh shield closed at each end The radiation under condition 2 is the same as condition 3. The radiation in condition 2 and condition 3 is 13dB below condition 1. >From this I infer that closing the ends makes no difference, as several here have stated. I can improve the model in various ways but I will wait for more input from all of you. NEC-2 Model: 7.0" differential line spaced 0.1" 7.5" mesh shield Mesh shield: Six sides 0.5" diameter 0.5" distance between "rings" Dave Cuthbert Micron Technology - - 2005 IEEE Symposium on Product Safety Engineering 3-4 October Schaumburg, IL http://www.ieee-pses.org/symposium 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
