2007 ieee international symposium on electromagnetic compatibility

More documents

Recommendations

Info

18EMC <strong>2007</strong> ADVANCE PROGRAMpredicted the general statistical distribution of the complex reflectioncoefficient S11 of a test port connected to a transmitting antenna, butone measure of the variation was off by a factor of two. We eventuallytraced the increased variability to enhanced backscatter, in whichreflections back in the direction of the source antenna tend to be largerthan reflections in any other direction. Enhanced backscatter is aphenomenon generally associated with remote sensing, especiallyrelated to random media. We give general explanations of this effectbased on a simple ray-optics model.New Hybrid Mode-stirring Technique for Shielding EffectivenessMeasurement of Enclosures Using Reverberation ChambersSandra Greco; and Maria Sabrina Sarto, — University of Rome “LaSapienza”This paper presents a new method for the measurement of the shieldingeffectiveness of “small” enclosures. The technique implements ahybrid mode-stirring technique on nested reverberation chambers.The mismatching of the antenna radiating inside the enclosure undertest is taken into account.Sensitivity Analysis of a Reverberation Chamber WithRespect to Tuner SpeedsVignesh Rajamani; Charles Bunting; and James West, — Oklahoma StateUniversityThe energy distribution among the modes in an overmoded reverberationchamber operating at a particular frequency is studied forvarying tuner speeds. The understanding of this spread is importantin quantifying upsets of equipment in the chamber. The spectralcharacterization of a time varying electromagnetic field is done usingthe averaged periodogram approach. The complex insertion loss S21is the measured quantity and an estimation of the power insertionloss that will be used in the determination of Q factor, is obtainedfrom the sampling data for varying angular positions of the tuner.The same procedure is followed for varying tuner speeds and the Q isreported. The autocovariance for this random process can be foundby taking a Fourier transform of the spectral density function. Theautocovariance function helps in determining the number of independentsamples of the field. The field experienced by an EUT in theusable volume due to a continuous rotation of the tuner is analyzed.Evaluation of Test Reproducibility of Calibration inReverberation ChamberJinliang He; Rong Zeng; Shuiming Chen; and Bo Zhang, —Electromagnetic Environment Research Group; Fan Wu, High Frequency &Microwave Division; and Zhiyong Yuan, Electromagnetic EnvironmentResearch GroupThe position of the transmit antenna is analyzed and evaluated accordingto the measurement data in our developed reverberation chamber.The calibration parameters of the reverberation chamber are also evaluatedfor different working volumes. The key parameters such as theaverage normalized electric field and the receive antenna calibrationfactor are analyzed in detail. It is indicated that the definition of theworking volume and the different position of the transmit antenna hasa little influence on the test reproducibility of calibrations.REVERBERATION CHAMBER MEASUREMENTS IIAn Investigation of the Shielding Performance of PCB-levelEnclosures using a Reverberation ChamberYuhui He; and Andrew Marvin, — University of YorkPCB-level shielding enclosures differ from the other shielding productsin several aspects due to their small volume and therefore posenew challenges to the evaluation of performance. This paperdescribes several possible approaches and issues about using a reverberationchamber to accomplish a fast and reliable measurement.The interaction between the internal source and the enclosure is alsoinvestigated. In addition, the performance of the enclosure in isolatingnear-field interference in a high-Q environment, which is generalin practical applications, is compared with the measurement resultfrom the proposed reverberation chamber method. An approach isalso introduced to indicate the impact of changing environment tothe near-field coupling.In-situ High Field Strength Testing Using a TransportableReverberation ChamberFrank Leferink, Thales NederlandA reverberation chamber can create a very high field strength withmoderate input power. Existing chambers are making use of a paddlewheel to change the resonant modes in the chamber. In the caseof a stepper motor, the field is stable for some time, and this type ofreverberation chamber is called a mode tuned reverberation chamber.If the paddle wheel is continuously rotating we call it a mode stirredreverberation chamber. The mode stirred is much faster in measuringthan the mode tuned, but for some applications where theequipment under test has a long dwell time the mode tuned is preferred.A transportable reverberation chamber with varying anglesbetween wall, floor and ceiling and with vibrating walls has beenused for in-situ testing of a large radar antenna system. Inside thisVibrating Intrinsic Reverberation Chamber (VIRC) a diffuse, statisticallyuniform, electromagnetic field is created without the use of amechanical, rotating, mode stirrer. This chamber results in a betterhomogeneity and increased field strength compared to conventionalmode stirred reverberation chambers. But the VIRC has a disadvantagebecause it cannot be used for mode tuning. In this paper, aTuneable Intrinsic Reverberation Chamber (TIRC) is presented. Thechamber is still made of flexible material and thus transportable, butthe modes are changed using either a paddle wheel or by moving thewalls in small incremental stepsComparison of Different Definitions of Field Strength Usedin Reverberation Chamber StandardsLuk Arnaut, National Physical Laboratory; Hans Georg Krauthaueser,Otto-von-Guericke-Universitaet Magdeburg; and Magnus Hoeijer, FOISwedish Defence Research AgencyIn different standards involving reverberation chambers, the fieldstrength is defined either using the vector magnitude (total) electricfield, or the magnitude of a Cartesian (rectilinear) component. Wecompare these methods for determining the maximum field strength.The ratio of the maximum of the total field to the maximum of aCartesian component is a random variable whose probability distributionand statistics are derived and investigated. The mean value of thisratio is compared with the ratio of the respective mean values. Its standarddeviation enables the estimation of confidence levels when comparingor converting between single measurements of the maximumtotal and maximum rectangular field. Theoretical results are comparedwith measured results obtained in different reverberation chambers.How to Avoid Unstirred High Frequency Components inMode Stirred Reverberation ChambersOlof Lunden, FOI; and Mats Bäckström, Saab CommunicationsA goodness of fit test of the assumed Chi- Squared distribution, ofthe power received by an antenna in a reverberation chamber, is a very©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org
EMC <strong>2007</strong> ADVANCE PROGRAM 19efficient way to reveal the presence of unstirred components at frequenciesabove the lowest usable frequency. To reduce the risk ofhaving an unstirred component, in RS-testing, the transmittingantenna has to be directed towards the stirrer. The distance betweenthe transmitting antenna and the stirrer has to be so close that themain lobe of the antenna is enclosed by the geometry of the stirrer.In RE testing this will hold also for the reference antenna. Unstirredcomponents are not possible to reveal and correct for in RS- and REtesting,which might lead to erroneous testing.Measuring Shielding Effectiveness of SmallEnclosures/Cavities with a Reverberation ChamberChris Holloway, National Institute of Standards and Technology (NIST)For various applications, there is a growing need to determine theshielding effectiveness of physically small (but electrically large)enclosures or cavities. This paper presents a reverberation chambertechnique for measuring the SE of such enclosures. Data is presentedfrom four different reverberation chamber approaches obtainedfrom various enclosure configurations. These four different sets ofmeasurements are used to validate the proposed approach.TEM CELL MEASUREMENTSA Field Uniformity Study of a TEM Cell by Using a ShortWire ScattererTakehiro Morioka, National Institute of Advanced Industrial Science andTechnology (AIST); Robert Johnk, National Institute of Standard andTechnology; and David Novotny, National Institute of Standard andTechnologyTEM cells are widely used for EMC/EMI measurements. However,the electric field strength only at the center point of the cell is roughlyestimated. By introducing a passive scatterer into the cell, such asa straight wire, the echo fields can be detected by the deviation of thereflection coefficient from that of the empty cell. This deviation isrelated to the incident electric field at the location of the scatterer. Inthis paper, the electric field uniformity of a TEM cell for the dominantand orthogonal polarizations is investigated by measurement.New Test Method for the Pulse Immunity of MicrocontrollersThomas Steinecke, Infineon Technologies AGThis paper presents a new test method for pulse susceptibility ofmicrocontrollers which reflects the electromagnetic environment ofmicrocontrollers in practical applications. The method includes a setof electromagnetic interference pulses and their injection networks.The waveforms of the pulses are deduced from measurements on realapplication boards of microcontrollers.Mode Suppressed TEM Cell Design For High Frequency ICMeasurementsShaowei Deng, University of Missouri-Rolla; David Pommerenke,University of Missouri-Rolla; Todd Hubing, Clemson University; JamesDrewniak, University of Missouri-Rolla; Daryl Beetner, University ofMissouri-Rolla; Sungnam Kim, LG Electronics; Dongshik Shin, LGElectronics; and Hocheol Kwak, LG ElectronicsTEM cells or GTEM cells can be used to evaluate the radiated emissionsof integrated circuits (ICs). The applicable frequency bandwidthof a TEM cell is limited due to the resonances of higher order modes.This paper describes how a TEM cell can be modified to extend thefrequency range without changing the test topology. Several methodsare proposed and implemented to suppress the higher order modes.The magnetic field coupling and electric field coupling are evaluatedfor the new design. The frequency bandwidth of the modified TEMcell is extended from the original 1 GHz to 2.5 GHz.Evaluation of Electromagnetic Interference Between a UWBSystem and a Wireless LAN Using a GTEM CellMasashi Yamada, Musashi Institute of Technology; Kaoru Gotoh, NationalInstitute of Information and Communications Technology (NICT); ShinobuIshigami, NICT; Yasushi Matsumoto, NICT; and Masamitsu Tokuda,Musashi Institute of TechnologyIn this paper we propose a method of evaluating interference betweenthe UWB and the wireless LAN by using the GTEM cell that cantest the receiver with the built-in type of antenna. We show that theGTEM cell can be used in the frequency band of DS-UWB by theevaluation of the frequency response. The interference evaluation wasconducted between a wireless LAN IEEE802.11a and a DS-UWB.As a result, even if the UWB signal is smaller than the receiver noiseof the wireless LAN, the through put deteriorates more than that inthe case of non-interference. Moreover, the signal of the DS-UWBwas equivalent to the AWGN in a case of the through put variationof 64QAM. Finally, we evaluated the separation distances within theregulation limits of the FCC and Japan.SPECIAL SESSION: EMERGING EMC TECHNOLOGIES IN JAPANNew Radiated Immunity/Susceptibility Test Method Using aFour-Septum TEM Cell: Measurements and Field AnalysisKimitoshi Murano, Tokai University; Hiroko Kawahara, University ofElectro-Communications; Majid Tayarani, Iran University of Science andTechnology; Fengchao Xiao, University of Electro-Communications; andYoshio Kami, University of Electro-CommunicationsA four-septum TEM cell has been proposed as a new radiated radiofrequencyimmunity/susceptibility test device. The cell provideselectromagnetic fields rotating at a very low rate by generating a setof two orthogonal balanced-mode fields. In this paper, a test methodusing the cell is clarified, and susceptibility characteristics of twotypes of microstripline models are investigated to verify the effectivenessof the cell and the role of the dielectric material is madeclear. In addition, an analysis method of the internal electromagneticfields, which are different from those used in an ordinary TEM cell,is discussed using an image method.Methods of Evaluating Information Leakage from PC DisplaysToshihide Tosaka, National Institute of Information and CommunicationsTechnology (NICT); Kaori Fukunaga, NICT; Yukio Yamanaka, NICT;Ryo Ishikawa, NTT Advanced Technology Co.; and Mitsuo Hattori, NTTAdvanced Technology Co.To evaluate the possibility of information leakage (tapping) byobserving electromagnetic disturbance radiated from a PC display,the most straightforward way is to reconstruct the displayed imagefrom the measured signal using a special receiver. However, such areceiver is neither popular nor commercially available. Therefore, wepropose two types of evaluation methods that are based on 1) themeasurement of the difference in level when different images are displayed,and 2) the measurement of the frequency component of thehorizontal sync signal within the electromagnetic disturbance. Inboth proposed methods, we only need a spectrum analyzer that iscommonly used for EMI measurement.Electromagnetic Field Distribution Measurements using anOptically Scanning Probe SystemMasanori Takahashi, NICT; Katsumi Kawasaki, NICT; Hiroyuki Ohba,NICT; Hiroyasu Ota, NICT; Tatsuru Orikasa, Advantest Laboratories©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org
Page 3 and 4: WELCOME FROM THE CHAIRJanet O’Nei
Page 5 and 6: Why Meet The StandardsWhen You Can
Page 7 and 8: Come see us at theIEEE EMC Symposiu
Page 9 and 10: EMC 2007 ADVANCE P
Page 14 and 15: 14EMC 2007 ADVANCE
Page 16 and 17: 16EMC 2007 ADVANCE
Page 45 and 46: WORKSHOPS - 8 and 9 July 20
Page 53 and 54: 10'IEEE EMC SYMPOSIUMJULY 10-12, <s
Page 57 and 58: SOCIAL ACTIVITIESEMC 2007</
Page 70 and 71:
70EMC 2007 ADVANCE
show all

2007 ieee international symposium on electromagnetic compatibility

Create successful ePaper yourself

Delete template?

Save as template?