In article <003601c52bb6$bece23b0$6401a8c0@homepc>, Iain Summers <[email protected]> writes
> I am doing a PhD in the UK on the radiated emissions from BPL. I am > looking at the measurement techniques and the associated errors > that arise from using what are effectively far field techniques > brought into the near field. > > If anyone has any views on measuring large structures that are not > an a qualified OATS and also in the near field I would be keen to > hear them. Since you have already done some measurements, you will already know that the results are more chaotic than anything else. >I hope to publish a paper later this year covering such > things as field attenuation with distance, using loops and > monopoles, and the conversion of H to E using 377 Ohms as an > assumed impedance. Well, what you already know is that there is no general solution for field attenuation with distance in a real-world near field, and that 377 ohms isn't correct, even according to the simplest theory and simplest configurations. The error created by using 377 ohms in real set-ups is almost always not negligible. I hope you get some useful results, but I don't envy you your task. -- Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except 'What is a Moebius strip?' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk 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
