Conformity Magazine - February 2009 - (Page 41)

This methodology is used to study the EMI performance of an optical device with a small PCB located inside. Due to the small details, the high frequency range of analysis, and the high aspect ratio between the calculation domains (necessary to get accurate far field results in the low frequency range), this type of study would be nearly impossible, or would at least require higher computation resources. A. Ciccomancini Scogna is with CST of America, Inc., and can be reached at antonio.ciccomancini@cst.com. S. Zimin is with Finisar Corporation, and can be reached at sergey. zimin@finisar.com. References 1. A. Ciccomancini Scogna, “Smart design rules to address EMC-EMI challenges by using 3D Electromagnetic simulation software,” Conformity, March 2008, www.conformity.com. T. K. Sarkar, and A. Taaghol, “Near-field to near/far-field transformation for arbitrary near-field geometry utilizing an equivalent electrical current and MoM,” IEEE Trans. Antennas Propagat., vol. 47, no. 3, pp. 566-573, March 1999. 3. P. Petre and T. K. Sarkar, “Planar near-field to far-field transformation using an equivalent magnetic current approach,” IEEE Trans. Antennas Propagat., vol. 40, no. 11, pp. 1348-1356, November 1992. A. Taaghol and T. Sarkar, “Near-field to near/farfield transformation for arbitrary near-field geometry utilizing an equivalent magnetic current,” IEEE Trans. Electromagn. Compat., vol. 38, no. 3, pp. 536-542, August 1996. J. Shi, J. He, E. Chan and Al, “Equivalent Radiation Source Extraction Method for System Level EMI and RFI Prediction”, in Proceedings of IEEE International Symposium on EMC, Detroit, August 2008. CST PCB STUDIOTM, www.cst.com. CST MICROSTRIPES 2009TM, www.cst.com. CST STUDIO SUITE 2009TM, www.cst.com. T. Weiland, “A Discretization Method for the Solution of Maxwell’s Equation for Six Component Fields,” Electronics and communication, (AEÜ), Vol.31, 1977. 4. 5. 6. 7. 8. 9. 2. 10. P. Johns, “A Symmetrical Condensed Node for the TLM Method,” IEEE Trans on Microwave Theory and Technique, 1987. FAST Link www.conformity.com/2650 a a b Figures 18a and 18b: EMC radiation at 3 meters from the transceiver (frequency range 0.01-40GHz): a) isolated module; b) comparison between isolated optical module and mounted (on PCB) optical module Figures 19a and 19b: E field magnitude on 2D plane: a) 1GHz; and b) 20 GHz b february 2009 Conformity 1 http://www.conformity.com http://www.cst.com http://www.cst.com http://www.cst.com http://www.conformity.com/2650

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Conformity Magazine - February 2009 Contents Editor's Note FCC Clarifies Closed Captioning Requirements for DTV Receivers Commission Cracks Down (For the Fifth Time!) On Junk Fax Marketer FDA Requests Comments on Global Harmonization Documents Australia Now Requires Solar Panel Testing and Certification EU Drafting New Directive on Toy Safety EU Commission Revises Standards List for EMC, R&TTE Directives Additional Standards Published For the EU's Medical Devices Directive EU Commission Publishes Additional Standards for Directives on Active Implantable, In Vitro Medical Devices EMC For the Functional Safety of Automobiles ESD Open Forum The ILAC Arrangement: Facilitating Trade Efficient Methodology for the EMI Analysis of Optical Transceivers Including PCBs and/or Flex Circuits The EuP Directive - Implementation, Design Requirements and Issues Chambers, Shielding, and Accessories Buyer's Guide CPSIA Lead Requirements Apply to Existing Inventory, Says CPSC CPSC Clarifies Certifcation Requirements Other CPSC Actions in the News IEC Standards Update Product Reviews UL standards Update Telcordia Standards Update From Our "You Can't Make This Stuff Up" Department Looking Back: Items from Past Issues of Conformity Advertisers

Conformity Magazine - February 2009

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