Have the transmit power spread over a sphere with a radius of d. Assume far field so that the vector quantity ExH equals E^2/377ohms. You have now only E, P, d and all the numbers. Good luck! Ari Honkala
_____ From: [email protected] [mailto:[email protected]] On Behalf Of ext Daniel Liang Sent: 23. marraskuuta 2007 8:38 To: [email protected] Subject: Electric field strength formula. Dear Experts, I know there is a formula to estimate the electric field strength by the ERP : E(V/m)=(sqrt root of (30 x p)/d) where p=power in Watt D= distance (m) from EUT E= electric field strength Could anyone know how to derive it from? Thanks very much. Regards, Daniel. _______________________________________ 辣茩妏蚚閉湮⺍講捇誥蚘眊 http://cn.mail.yahoo.com - ---------------------------------------------------------------- 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 ______________________________________________________________________
