2007 ieee international symposium on electromagnetic compatibility

26EMC <strong>2007</strong> ADVANCE PROGRAMusing a noise separator. A design example is carried out experimentallyon the implemented filter according to EN 55022 Class B toverify the validity of the design procedure.SPECIAL SESSION: AUTOMOTIVE EMC DESIGN AND MODELINGCircuit Board Layout for Automotive ElectronicsTodd Hubing, Clemson UniversityEMC and environmental requirements placed on automotive electronicspresent unique board layout challenges. This paper discussescomponent placement and trace routing strategies for circuit boardsthat will be used in automotive applications.Modeling Coax Cable EMI Shielding Performance forAutomotive AM Broadcast Band ApplicationsRichard Wiese, General MotorsAutomotive broadcast reception systems typically use common coaxcable to convey RF energy from the antenna to the broadcast receiver.In special cases a modified low capacitance coax is used for crossvehicle runs to enhance performance in the AM band. Coax is specifiedby characteristic impedance, optical coverage, DC resistance perunit length, and RF loss versus frequency per unit length. Opticalcoverage and DC resistance serve to provide a gauge for relativeshielding performance to EMI. EMI currents on the shield translateto an impressed voltage at the receiver via the transfer impedance ofthe coax. This paper examines the near-field magnetic shieldingeffectiveness of coax and the relationship to standard methods forshielding effectiveness. A 2-D quasi-static solver application is usedfor the analysis.Validation of Worst-Case and Statistical Models for anAutomotive EMC Expert SystemDaryl Beetner, University of Missouri-Rolla; Haixiao Weng, TexasInstruments; Todd Hubing, Clemson University; and Meilin Wu, Universityof Missouri-RollaAn EMC expert system has been developed to predict potentialelectromagnetic compatibility problems in a vehicle early in thedesign process. Here, the accuracy of inductive and capacitivecoupling algorithms are verified through representative measurementsof crosstalk within an automobile. Worst-case estimatesused by the algorithms are compared to measured valuesand are compared to values estimated using statistical methods.While an approximate statistical approach is feasible even forsophisticated designs, worst-case estimates better ensure thatproblems will not be missed even in the absence of complete systeminformation.Impact of Intra-Vehicular Electromagnetic Interference onTire Pressure Monitoring SystemsVikas Kukshya, HRL Laboratories; Hyok Song, N/A; Hui P. Hsu, N/A;and Richard Wiese, General MotorsThe next generation of vehicles will use a wide range of electronicsensors and systems to monitor and regulate various vehicular performanceand safety functions. However, before such systems canbe formally introduced in the vehicles, it is crucial that the potentialimpact of vehicular electromagnetic interference on these systemsbe evaluated thoroughly. In this paper, we use an end-to-endsystem simulator to quantify the impact of various levels and typesof electromagnetic interference in a typical vehicular environmenton the performance of a direct measurement Tire PressureMonitoring System.International Electrotechnical Commission DocumentsCISPR 12 and CISPR 25: An OverviewPoul Andersen, ConsultantThis document presents an overview of CISPR 12 and CISPR 25 anddiscusses some of the changes being made in the new edition of eachdocument currently in the balloting process.Vehicle EMI Integration Issues Identified by PrecomplianceTest MethodsScott Mee; Sreeniwas Ranganathan; Craig Harder; and Steve Mainville, —Johnson Controls Inc.Automotive electronics systems are becoming increasingly complexeach year. At the same time, interior styling and exterior body trendsare causing these sophisticated electronics to be packaged in smallerspaces. As a result, vehicle integration testing has been a focus areafor Original Equipment Manufacturers (OEMs) to ensure there isadequate evaluation of such systems prior to mass production.Vehicle level integration testing requires time and extensiveresources to perform. The need for performing additional vehicletesting and correcting integration issues can be avoided by performingearly precompliance testing. This paper discusses five uniqueprecompliance test methods that correlate to the vehicle that identifyEMC issues.Evaluating Cell Phone and Personal CommunicationsEquipment and Their EMC Effects on Automotive Audio andIn-Cabin ComponentsCraig Fanning, Elite Electronic Engineering IncThe purpose of this R&D project was to evaluate current andfuture personal communications technologies and their potentialeffect on vehicle components. Along with the increase in cellphone use in automobiles, the newer and smaller cell phones canbe placed virtually anywhere within the cabin of the vehicle. As aresult, cell phones now are being placed in unforeseen locationsand often in close proximity to various electronic components,giving rise to potential interference and compatibility issues.This study focused on the frequency range of 800 MHz to 2.5GHz. The analysis generated a summary of the frequency spectrums,modulations and output power levels used by these technologies.Following completion of the technology evaluation,various types of radiated immunity tests were performed on automotivecomponent samples provided by a variety of manufacturers.The samples had known compatibility issues with cell phoneswhen installed in the vehicle. The testing was performed todetermine what type of test, test levels, and carrier signal modulations,could be used during component level evaluation in orderto identify these potential compatibility issues before they reachthe vehicle.AUTOMOTIVE EMC MEASUREMENTSVehicle Active Antennas Face EMC and RF Reception ChallengesJean-Roger K. Kuvedu-Libla, N/APresently, the vehicle active antennas are facing two big challenges.One of them is to meet the requirements of radio frequency (RF)reception and the next one is to respond to electromagnetic compatibility(EMC) demands at the same time. For that, the questions thispaper answers are: 1) incorrect consideration / definition of theseantennas; 2) influencing parts of the passive antenna structures, forexample the ground influence; and 3) the specification of necessaryamplifier noise floors and gains.©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org