Conformity Magazine - March 2008 - (Page 54)

as well as the advantages, disadvantages and reliability of simulation software. Multiple examples have been presented, like the analysis of the effect of different shapes and configuration of apertures on the SE of a metallic enclosure. The SE of some combinations of multiple apertures shows that dividing a fixed area into some smaller apertures will lead to more efficient shielding than implementing only one aperture. This is helpful when optimizing the shape of open area used to feed trough cables or heat dissipation. The SE when honeycomb panels are employed is also analyzed. By combining a specialized board analysis tools based on PEEC method with a 3D full wave EM simulation tool, a consistent approach to compute the electromagnetic emissions of complex electronic systems can be demonstrated. The proposed workflow consists on three steps: 1) simulation of the complex PCB; 2) surface current distribution/Nearfield used to excite the enclosure; and 3) full wave simulation of the metallic box. The reliability of 3D EM simulation is proven by comparing different technique as well as by providing measured data results. A. Ciccomancini Scogna is with CST of America, Inc., and can be reached at antonio.ciccomancini@cst.com. References 1. J. Parkes, J. Bracken, Z. Cendes, “EMC Simulation of Complex High Performance PCBs and Shielding Effectiveness”, in Proceedings of DesignCon 2006, Santa Clara, CA, USA. EZPP - www.ems-plus.com/ PCBmod, Simlab – www.simlab.com Speed 2000 – www.Sigrity.com CST Studio Suite 2008TM –www.cst.com Microstripes – www.flomerics.com C. F. Bunting, Khan Z. A. and Deshpande, M.D, “Shielding effectiveness of metallic enclosures at oblique and arbitrary polarizations” IEEE Trans. Electromagn. Compat., vol. 47, no. 1, Feb. 2005, pp. 112–122. A. Ciccomancini Scogna, M.Schauer, “EMC Simulation of Complex PCB inside a Metallic Enclosure and Shielding Effectiveness Analysis”, on Proceeding of EMC Zurich 2007, Munich, September 2007. 9. http://aces.ee.olemiss.edu 2. 3. 4. 5. 6. 7. 8. Figure 9: Comparison between measured results and numerically simulated results: horizontal (Ex) and vertical component (Ey) of the electric field within the frequency range 30MHz-1GHz. 10. G. Antonini, A.Ciccomancini Scogna, A.Orlandi, “Shielding analysis of a metallic enclosure by means of a statistical approach” in Proceedings of EMC Europe 04, Eindhoven, 6-10 September, 2004. 11. Ciccomancini Scogna, “Shielding Performance of a Metallic Rack used for Telecommunication Equipments: FIT modeling and Measurements”, in Proceedings of IEEE Int. Symposium on EMC Zurich 06, Singapore, February 2006 FAST Link www.conformity.com/1570 Figure 10: Metallic enclosure used for telecommunication equipment: a) 3D EM model and b) E-field plot at 1.5 GHz. 5 Conformity marCh 2008 http://www.ems-plus.com/ http://www.simlab.com http://www.Sigrity.com http://www.cst.com http://www.flomerics.com http://aces.ee.olemiss.edu http://www.conformity.com/1570

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Conformity Magazine - March 2008 NewsBreaks Editor's Note Adelstein Renominated to the FCC Industry Canada Publishes FAQs On RF Fields FDA Gives Its Scientific Capabilities Poor Marks FDA Offers Guidance On its Product Review Process FDA Publishes Updates to List of Recognized Standards FDA Warns of Patient Risk From Electric Dental Handpieces Complying with the EMC Directive, Second Edition ESD Open Forum Emerging Issues in Standards - Korean "RoHS": Not Like RoHS at All The iNARTE Informer Challenges in Testing - Field-Induced Charged Device Model: What Really Happens Design Fundamentals - EMI Shielding Technologies for Consumer Electronics Equipment Focus On...Compliance Software Buyer's Guide Additional Standards Published for the EU's ATEX Directive Additional Standards for the EU's Medical Devices Directive Also Published China to Require Bar Codes to Enhance Product Safety CPSC Releases 2007 Self-Assessment CPSC Actions in News IEC Standards Update UL Standards Update Product Reviews Telcordia Standards Update From Our "You Can't Make This Stuff Up" Department Looking Back: Items from Past Issues of Conformity Advertisers

Conformity Magazine - March 2008

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