2007 ieee international symposium on electromagnetic compatibility

EMC <strong>2007</strong> ADVANCE PROGRAM29mode interference obtained adopting different discharge points and differentgrounding configurations are presented. The influence of positiveand negative discharges on the measured interference is verified.Susceptibility of Electronic Devices to Variable TransientSpectraSven Korte; and Heyno Garbe, — University of HannoverThe subject of this paper is to investigate the susceptibility of microcontrollersto single transient signals. It is shown that the principlecoupling of transient field pulses into electronic systems is limited inbandwidth. In order to investigate the different resulting pulseformsand to estimate the effect on the susceptibility of the electronicdevices, a setup is presented that gives the opportunity to emulate thefield coupling in systems with different coupling sizes. The degenerationof the disturbing signals by the input impedance of the chip isgiven attention as well as on the susceptibility of the chip itself.Methodology for the HEMP Clearance of a Modern Air FighterFrank Sabath, WIS; Anthony Wraight, QinetiQ; Alfred Brenner, EADS;and Chris Jones, BAE SystemsIn this paper, we will discuss the route to High-altitudeElectromagnetic Pulse (HEMP) qualification of a modern fighter aircraft.We will describe the clearance process of the EurofighterTyphoon program and discuss particular aspects due to technical considerationsand in regard to cost efficiency. The systematic structureof the HEMP clearance process and the overall clearance philosophywill be presented. In order to get relevant information as early as possiblethe chosen clearance process is based on three essential measurementsteps (equipment level qualification, coupling measurements,and system level test) that are linked together by a predictionalgorithm for induced currents and data analysis. The final assessmentprocess employs a set of response norms to compare the aircraftresponse with the results of equipment level qualification testing.Systematic Description of the Protection Capability ofProtection ElementsRoland Krzikalla, Hamburg University of Technology; Frank Sabath, WIS;and Jan ter Haseborg, Hamburg University of TechnologyHigher demands on the safety and stability of electronic systemsrequire the further development of protection concepts against electromagneticinterferences. Especially, interferences with an extremelybroad frequency bandwidth combined with very high voltageamplitudes are a serious threat against sensitive electronic systems.Due to the very high frequency parts of the interference, the behaviorof the nonlinear protection circuits that are used depends moreand more on parasitic linear components. Therefore it is of specialinterest to know in which circumstances a system can be declared asprotected against electromagnetic interferences. For that, a definitionof the term “is protected” has to be discussed due to a definitionof different success levels. These success levels are correlated witheffects that can occur in the system which can also be classified.Together with a description of the prediction of effect threshold levelsin complex systems, this paper describes a method for determiningthe protection capability of possible protection elements.SPECTRUM MANAGEMENTWireless Mobile Communication Systems with HighFrequency Efficiency — Without Pilot SignalsMichael Bank, HIT; Jakob Gavan, HIT; and Miriam Bank, N/AMultipath propagation has always been a considerable technical challengein radio communication systems with a mobile transmitter ormobile receiver. One of possible options to overcome the correspondingdifficulties is the OFDMA method of data transmission. It providesrather good performance for the point-to-multipoint transmissionin systems without considerable Doppler frequency offset.However, increasing of the used frequency band and permanentgrowing of the traffic make Doppler shift influence more and more acritical point in radio modem designs. Here a principally newmethod of multiple access — so called Frequency Bank Signal (FBS)— is proposed. FBS combines the phase shift compensation used inthe PAL-TV system, OFDMA principle, and spread spectrum ideawith Walsh functions.Ultra Wideband EMI To Legacy ReceiversWilliam Duff, SEMTASThe application of FBL technologies to industrial controls is a logicalstep in the war on terrorism. Petroleum plants, chemical plants,mines and other automated industrial controls are susceptible to electromagneticinterference, electromagnetic intrusion, and electromagneticpulse (EMP) weapons. Control of industrial elements such asvalves and pumps cannot be hijacked or impeded by terrorists withelectromagnetic weapons from outside of the facility if the industrialelements are controlled via optically switched actuators and passiveoptical sensors on inherently EMI immune fiber-optic networks.Interference Characterization and Mitigation of 5.5 MbpsCCK Wi-Fi SignalsAyham Z. Al-Banna; Xiaoguang Zhou; Tae Ri Lee; Joseph L. LoCicero;and Donald R. Ucci, — ECE Department, Illinois Institute of TechnologyAn exact Power Spectral Density (PSD) expression is derived forIEEE 802.11b 5.5 Mbps signals using Complementary Code Keying(CCK). The analytical result obtained is verified through computersimulation. The spectral signature of the 5.5 Mbps CCK – modulatedsignal is compared to the PSD of the Barker-spread Wi-Fi signals.The adjacent channel interference power resulting from the 5.5Mbps CCK interferer is introduced and compared to that caused byBarker-spread signals. Adaptive antennas with tapped delay lines areused to mitigate the effect of these interference signals. Optimalranges of the tapped delay lines are found such that performance isrestored at minimum cost.SPECIAL SESSION: WAVEFORM DIVERSITYWhy and What is Waveform Diversity, and How Does itAffect Electromagnetics?John Garnham; and Jaime Roman, — SAICThis paper provides a general overview of the new research area calledwaveform diversity (WD), and it’s potential impact to the EMC community.The scope of research that is considered WD is broad in bothtechnical content and application. The two main application areasare radar and communications across the RF spectrum. As WDbegins to transition from theory, to hardware experiments, to testing,and to operational systems, the effect on RF design and EMC analysismay be significant. This paper describes the broad area of WD,why people are researching it, and potential effects on EMC. A systemcan perform better in a multi-path fading environment than aconventional (single-channel) communication system without anymulti-path fading.Waveform Diversity and Electromagnetic CompatibilityGerard Capraro, Capraro Technologies, Inc.; Ivan Bradaric, CapraroTechnologies, Inc.; and Michael Wicks, U. S. Air Force Research Lab©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org