I used femm 4.2 and Hershey MC models to predict results of SAR testing and got better than 5% accuracy when compared to measurements on beef fat slabs from a local butcher. Just remember PSpice, LTspice, and femm ALL use peak voltage so must use sqrt(2)* Vrms value, else be off by 2:1 in power calculations. The wrong direction.
Interesting question, whether the SAR rms value is independent of frequency. The models suggest you can calculate each and simply add the power. I do not remember any non-linearity coefficients in them, simply ables of conductivity vs freq etc. But considering the perversity of nature and the conductivity being frequency dependent, you may find you get more heat than expected. I believe this company sells SAR predicting software, or will do it for you: notes from telco with Chad: 10/7/08 888 773 6266 x285 Chad 10:20 use SAR Models from Hershey Medical Center they contain characteristics of tissue versus frequency Remcom 1-888-773-6266 315 South Allen Street, Suite 222 State College, PA 16801 Tel: 814-861-1299 1-888-773-6266 (1-888-7REMCOM) Toll-Free in U.S. and Canada Fax: 814-861-1308 1-888-973-6266 (1-888-9REMCOM) Toll-Free in U.S. and Canada http://www.remcom.com Good luck Regards, Robert --- [email protected] wrote: From: Robert Heller <[email protected]> To: [email protected] Subject: [PSES] SAR - MPE Date: Mon, 9 Apr 2012 11:13:32 -0500 Anyone familiar with SAR and MPE testing? If equipment passes SAR can you assume that it passes MPE? Can simultaneous transmissions at two different frequencies be tested or is it calculated? Is the heating effect additive? Thanks, Bob Heller 3M Company, 76-1-01 St. Paul, MN 55107-1208 Tel: 651-778-6336 Fax: 651-778-6252 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ 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]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ 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]>
