Conformity Magazine - August 2008 - (Page 33)

nsuring automotive electromagnetic compatibility (EMC) is dominated by experimental activities. However, the advent of electric and hybrid vehicles, and the increasing wide range of systems and frequencies which are used in vehicles, are expected to make automotive EMC an increasingly troublesome burden to vehicle manufactures. The adoption of numerical modeling techniques will soon provide the most cost effective approach for future automotive EMC engineering. For these reasons, design engineers and researchers have in recent years been intensively studying the design and the performance of automotive antennas and cable harnesses. One of the most challenging tasks is the development of models that allow a quick and reliable design process, speeding up the time to market, and reducing expensive testing times. E The present article investigates two typical problems of radiated electromagnetic disturbances: 1) a performance study of a conformal hidden antenna (whose purpose is to take control and protect a vehicle from being stolen); and 2) a crosstalk analysis, relating signal integrity (SI) issues and EMI emissions of a cable harness inside a vehicle. Antenna Performance and Nearfield/Farfield Radiation Modeling vehicle-based antennas necessitates modeling the whole car body as this forms part of the antenna system. Hidden antennas excite not only currents on the body shell, but also fields within the body cavity. Modeling such vehicle antenna systems is not a mature art, and much needs to be done to understand how much of the complex vehicle body detail needs to be included, and the effects of furnishings and passenger load on performance. The problem when dealing with such models is the high aspect In addition the demand on computer memory, even at low ratio (comparing the size of the vehicle and the dimensions of frequencies, remains a problem if some or all of the above the antenna and/or the cable harness/bundles) and, therefore, have to be included in the model. the high computational resources needed in order to perform numerical simulations. Several papers have reported on For this reason, numerical simulations are necessary to check vehicle simulations [1-5], but there is still a considerable whether the location is reasonable, and that the near field (for way to go in order to be confident on the prediction of the instance electric field and surface current distribution) as well simulated results, especially when test measurements are not as farfield values are acceptable. available. 1231_OAK_trd ad_Mil_MECH_1/2pg:1231_OAK_brand ad_1/2pg 12/6/07 10:14 AM Page 1 BE A HERO. AND SAVE THE DAY! Even under the most adverse conditions of extreme heat variation, thermal shock, and vibrations, the FaradFlex ultra-thin Buried Capacitance material will continue to enhance Printed Circuit Board speed and performance! BENEFITS OF BURIED CAPACITANCE ™ » Reduction in Discrete Capacitors and Associated Reliability Concerns of Solder Joints » Improved Power Distribution System » Reduced PCB size and/or increased functionality » Reduced Board thickness » Improved EMC/EMI FEATURES OF FARADFLEX® » Robust Product that is Compatible with Standard PCB Processes » Highest Capacitance Density and Thinnest Products Available » 100% High Potential (Hi-Pot) Tested » Compatible with Lead-Free Assembly at us 49 e Se oth 5 2008 Bo EMC MI E it, IEE Detro ENHANCING SPEED AND PERFORMANCE, ONE LAYER AT A TIME. To start enjoying the benefits of Buried Capacitance technology using the FaradFlex line of products contact Oak-Mitsui Technologies: (518) 686-4961 or FaradFlex.Sales@oakmitsui.com. Visit us at www.oakmitsui.com http://www.oakmitsui.com http://www.oakmitsui.com

Table of Contents Feed for the Digital Edition of Conformity Magazine - August 2008

Conformity Magazine - August 2008 Contents Editor’s Note FCC Seeks Comment on Reauction of 700 MHz D Block Commission Cracks Down (Again!) on Junk Fax Marketer Canada Levies Fees for Public Safety Radio Spectrum FDA Issues Guidance on Medical Device Tracking Greenpeace Challenges Video Game Manufacturers The IEEE EMC Society: A Proud History of Accomplishments ESD Open Forum An Update on Changes to the Automotive ESD Standard, ISO 10605 Modeling of Radiated Electromagnetic Disturbances in Automotive Applications Design Issues in Automotive Radio Frequency Systems IEEE EMC Symposium IEEE 2008 Show Preview Exhibitors Buyer’s Guide Product News Most Eco-Friendly Companies Updated Standards List For the EU’s Pressure Equipment Directive Commission Issues Updated Standards List For Directive on Gas-Fired Appliances HHS Releases Fact Sheet on U.S. Imports from China Customs Agents Seize Holiday Lights IEEE PSES Symposium Set for October CPSC Actions in the News IEC Standards Update UL Standards Update Telcordia Standards Update From Our “You Can’t Make This Stuff Up” Department Looking Back: Items from Past Issues of Conformity Product Reviews Advertisers

Conformity Magazine - August 2008

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