2007 ieee international symposium on electromagnetic compatibility

38EMC <strong>2007</strong> ADVANCE PROGRAMproblem, the line-of-sight link between Rosetta Orbiter and Landerwill be used to measure the back lobes of the CONSERT Landerantenna with high angular resolution.An Efficient Shielding Effectiveness Calculation on aRectangular Enclosure with Numerous Square AperturesParissa Dehkhoda; Ahad Tavakoli; and Rouzbeh Moini, — AmirkabirUniversity of TechnologyUtilizing the traditional transmission line model, the shielding effectivenessof an enclosure with numerous apertures is efficiently calculated.Here, the array of apertures is represented by an appropriateadmittance in the model. Since the representing admittance takesthe mutual coupling between apertures into account, the results aremore accurate than that of the traditional transmission line model.The results of this fast and accurate model are in very good agreementwith the MoM and semianalytical methods.COMPUTATIONAL ELECTROMAGNETIC MODELING IIIAnalytical HF Model of a Low Voltage DC Motor ArmatureIncluding Parasitic PropertiesJens Benecke; and Stefan Dickmann, — Helmut-Schmidt-UniversitätHamburgA high frequency (HF) electrical model of a DC motor armature isderived from its geometric and physical properties. This modelincludes the armature windings’ properties as well as inductive andcapacitive couplings between windings, armature, axis, and commutatorsurfaces. It provides sufficient detail to simulate the armature’scomplex impedance up to a frequency of approximately 1 GHz, providesexpressions to calculate the model elements from constructionparameters, and visualizes their influence on the impedance.Simulation Analysis on EMI of an ±800 kV UHVDCConverter StationZhanqing Yu; Jinliang He; Rong Zeng; Bo Zhang; and Shuiming Chen, —Tsinghua University; Hong Rao; Jie Zhao; Xiaolin Li; and Qi Wang, —Technology Research Centre, China Southern Power Grid Co. Ltd.Wide-band frequency EM noise is generated during the processes offiring and turn-off of thyristor valves in converter stations. The noisewill be conducted along the primary circuitry, and may interfere withsecondary systems by the way of conducted and radiated coupling.The ± 800 kV UHVDC transmission project is a newly developedtechnique and is not widely used in the world. The EMI problem isone of most important issue that should be studied deeply in thestage of designing. A method of conducted EMI analysis based onthe time-domain wide-band circuit simulation, as well as a methodof radiated EMI analysis based on the Method of Moments, are proposedand verified in the paper. The EMI levels of the ±800 kV converterstation, which is planned and being designed in China rightnow, are presented.An Investigation on ILCMs for Coupling of Fields into aGeneric Missile Body through AperturesLawrence Chirwa, University of Ulster; John F. Dawson; and Martin P.Robinson, — University of YorkThe conventional way of analyzing electromagnetic coupling intocavities is by means of full-wave solvers based on techniques such asthe finite-difference time-domain method, the method of moments,and the transmission line matrix (TLM) method. However, thesemethods require considerable computing resources and time to reacha solution. Intermediate level circuit models (ILCMs) have beenshown to be far more efficient than these conventional methods.They are simpler and quicker to formulate and require significantlyless time to reach a solution than conventional methods. This paperis on investigations in the bid to realize intermediate level circuitmodels for coupling into the generic missile body through apertures.A model for coupling via small apertures that yields credible results isrealized, and is validated against TLM results for the same problem.Simulation and Analysis of EMC Chambers by Ray TracingMethodMing-Shing Lin, National Yunlin University of Science & Technology; Jia-Ming Ji, Dayeh University; Chung-I Hsu, Dayeh University; and Han-Chang Hsieh, Deputy Director of Sixth DEPTThe ray tracing method in conjunction with image theory was usedin this study to establish an analysis tool for evaluating the propertiesof EMC chambers. Computer codes were written in Matlab forsimulating the normalized site attenuation (NSA), field uniformity(FU), and normalized site transmission loss (NSTL). By the simulationprogram, NSAs of a semi-anechoic chamber and NSTLs of a fullyanechoic chamber were simulated and compared with measuredresults. The effects of the second-order reflection on the simulatedNSAs of semianechoic chambers were discussed.Reduced Order Modeling for Transient Analysis of CarbonNanotube InterconnectsGiulio Antonini; and Antonio Orlandi, — University of L’AquilaA state-space formulation for transient analysis of carbon nanotubeinterconnects is presented. Peculiar features of carbon nanotubesrelated to electron transport are modeled in terms of per unit lengthparameters. The multiconductor transmission line is firstly approximatedby a ladder network; its admittance matrix Y is expressed interms of Chebyshev polynomials in a closed form. The knowledge ofthe roots of such rational representation makes it possible to generatea compact state-space macromodel of the nanotube interconnect byselecting only the dominant poles. Numerical calculations, performedin both frequency and time domains, confirm that the proposedmodel can be used to model carbon nanotube interconnects asa building block of more complex systems.TLM Simulation of RF Emissions and Confirmation ofResults Through TestingDavid Johns, Flomerics; and Boris Shusterman, EMC CorporationThe Transmission-Line Matrix (TLM) method has been developed forthe EMC analysis of circuits and equipment packaging. TLM is usuallyformulated in the time-domain, enabling transient phenomenasuch as lightning, EMP, and ESD to be analyzed. In addition, equivalentcompact models allow detailed features such as apertures andwires to be modeled in a computationally efficient manner whendealing with real-world structures. Recently the TLM technique hasbeen enhanced to enable complex circuits to be replaced with equivalentradiating sources for the simplicity of the analysis.SHIELDING PERFORMANCE MODELINGNumerical Modeling of Periodic Composite Media for anElectromagnetic Shielding ApplicationDagang Wu; Rui Qiang; Ji Chen; and Ce Liu, — University of Houston;Marina Koledintseva, UMR; Jim Drewniak, UMR; and BruceArchambeault, IBM CorporationThis paper describes a methodology to extract effective electricalproperties for a periodic composite medium. The extraction algo-©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org