Dear all How about the development about EMC simulation at PCB level=3F As to my e= xperience=2C there is the following development=2E It is my understand ab= out the development of EMI at PCB level=2E If there is anything wrong=2C = please give me some advice=2E 1=2EPaul proposed that common mode current is the main source of far fiel= d EMI in =22A Comparison of the Contribution of Common-Mode and Different= ial-Mode Currents in Radiated Emissions=22=2E Here the source of EMI is defined=2E 2=2EHorck et=2E proposed the transform between DM and CM by means of tran= smission line in =22Common-Mode Currents Generated by Circuits on a PCB--= Measurements and Transmission-Line Calculation=22=2E Here transform between DM and CM is partly explained=2E 3=2ELeone proposed the radiation from the PCB edge in =22The Radiation of= a Rectangular Power-Bus Structure at Multiple Cavity-Mode Resonances=22=2E= Here the radiation from the PCB edge because of CM current is solved=2E 4=2EGerman=2C et=2E proposed the effect of image plane in =22Effect of an= Image Plane on Printed Circuit Board Radiation=22=2E In the next year=2C= Hsu gave more explaination in =22The Validity of Image Plane Theory to P= redict Printed Circuit Board Radiation=22=2E Here the effect of image plane is solved=2E 5=2EHejase=2C et=2E proposed the radiataion effect of pigtail in =22Shiel= ding Effectiveness of Pigtail Connections=22=2E Goenen also proposed =22A= lthough the actual path of the cable determines its effectiveness to radi= ate=2C an average radiation resistance of the order of 100 to 150 ohm has been measured =5B= 13=5D over the frequency range 150 kHz=961 GHz=2E=22 in =22EMC workbench=3A= Testing methodology=2C module level testing and standardization=22=2E Here the radiation effect of cable is solved=2E 6=2ESignal integrity simulation has been solved in 90=27s=2E Power gound = plane pair modeling has been solved well=2E I have proposed method based on transmission line to solve problem combin= ed of SI and PI=2E The return current=2C common mode current=2C could be = exactly solved in the method=2E Here the source of EMI=2C SI and PI=2C is solved=2E There are a lot of other good paper which are not present here=2E In one = word=3A 1=2EThe source of EMI=2C common mode current=2C is caught out=2E 2=2EThree kinds of radiation structure are solved=2C power ground plan= e and cable=2E I think another is the trace on external layer=2E 3=2EThe original source of EMI=2C SI and PI=2C has been modeled well=2E= Therefore=2C I think the EMC simulation could be applied=2E All above is my understand about EMI simulation at PCB level=2E If there = is anything wrong=2C please give me some advice=2E Best Regards Zhangkun 2004=2E12=2E3 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx 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-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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