2007 ieee international symposium on electromagnetic compatibility

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36EMC <strong>2007</strong> ADVANCE PROGRAMEfficient Low-Frequency Modal Analysis of an AnechoicChamberLuis Nuno, N/A; Juan Balbastre, N/A; and Ignacio Monterde, PolytechnicUniversity of ValenciaAn efficient method to analyze the electromagnetic fields inside rectangularanechoic and semianechoic chambers from 30 to 100 MHz isshown. A modal expansion is employed to develop the homogeneousand the inhomogeneous field. This is combined with circuital techniquesto compute the effect of the layers of ferrite and dielectrics inthe walls of the chamber. Several numerical results of the Free SpaceTransmission Loss (FSTL) of an anechoic chamber and the NormalizedSite Attenuation (NSA) of a semianechoic chamber are provided.Calculation of the H-Plane Pattern Influence to the SiteVSWR Result Using the Monte Carlo MethodWolfgang Müllner; and Alexander Kriz, — Austrian Research CentersGmbH - ARCIn this paper the error in site VSWR measurements caused by imperfectomnidirectional transmit antennas is investigated. On the basis of the H-plane pattern published by the manufacturer, the distribution of the erroris calculated by means of the Monte Carlo Method. There are large differencesbetween the products from the Austrian Research Centers GmbHand from Schwarzbeck GmbH. In the frequency range from 1 to 18 GHz,the systematic error is less than 0.5 dB for the PODs and more than 2 dBfor the SBAs. The maximum deviation is -0.5 dB / +1 dB and -4 dB / +2dB respectively. The contribution to the measurement uncertainty, thevariance, is less than 0.1 dB and 1.4 dB respectively.Predicting Electromagnetic Coupling between HF, VHF, andUHF Antennas Using NECWilliam Duff, SEMTASThere are many applications where it is desirable for transmit andreceive antennas operating in adjacent frequency bands (e.g. HF,VHF, and UHF) to be co-located. In order to avoid EMI, it is necessaryto provide adequate isolation between the co-located antennas.This paper presents the results obtained by using NEC to calculatethe coupling for different geometric arrangements of the antennas.EMI Analysis of a GSM 900 MHz Antenna for a Large WindTurbine Hub with Method-of-MomentsBastian Lewke, Technische Universität München; Florian Krug, duringresearch work: GE Global Research; and Josef Kindersberger, TechnischeUniversität MünchenElectro-magnetic fields resulting from a GSM transmitter mounted ona large wind turbine will be analyzed. This cellular system operates asa novel communications back-up in case the standard communicationbetween the operator and hub control systems is interrupted. Themethod-of-moments is used to analytically describe the electro-magneticfields caused by a GSM 900 MHz transmitter mounted on the hubof a wind turbine. Using a commercial simulation tool, the electromagneticfield distribution will be analyzed to determine an optimizedwireless communication link to a base station. Different transmitterpositions are evaluated based on their radiation patterns. Scattering anddiffraction by the turbine’s rotation is taken into account.Ultra-Wideband Printed Circuit Antenna in Coplanar TechnologyHarry Lam; and Jens Bornemann, — University of VictoriaA printed circuit antenna in coplanar waveguide technology forultra-wideband measurements is introduced. The frequency of operationis 4 to 12 GHz with the VSWR less than 2 except for a verysmall band around 5.3 GHz. Omni-directional characteristics in verticalpolarization are demonstrated at two selected frequencies. Theanalysis method is verified against previous measurements.COMPUTATIONAL ELECTROMAGNETIC MODELING IAn Extended-Hybrid-Method: A Combination of MoM, GMTand UTDStefan Balling; Dirk Plettemeier; and Karl-Heinz Gonschorek, —Technische Universität DresdenA new Extended-Hybrid-Method (EHM) is proposed. It unites thewell known Method of Moments (MoM), the Generalized MultipoleTechnique (GMT), and the Uniform Geometrical Theory ofDiffraction (UTD). With this EHM, it is possible to calculate specialarrangements more efficiently in comparison to other standardcomputation methods. This is achieved by using the advantages ofeach method. As an example, the EHM is used to examine an antennanext to a human head model and a metallic door.Razor Blade Functions in the PEEC MethodVolker Vahrenholt, Institute of Electromagnetic Theory; Heinz-DietrichBrüns, Technical University Hamburg-Harburg; and Hermann Singer,Technical University Hamburg-HarburgModern electrical devices are of particular concern in terms of electromagneticcompatibility (EMC). Various numerical methods havebeen developed for EMC problems. One of those numerical methodsis the partial element equivalent circuit (PEEC) approach, which wasbasically developed in order to combine electrical circuits and electromagneticproblems, because a circuit formulation of the electricaldevices can be achieved. The standard PEEC formulation uses theGalerkin method in order to transform the EFIE into an equation system,and rectangular source functions are taken in order to apply analyticalintegration formulas. In this paper, the new possibility ofapplying razor blade functions is presented in order to allow the applicationof numerical integration within nearly the same computationtime as the analytical way. In addition, a higher accuracy is achieved,because Green’s function can totally be integrated including the retardationterm. Examples are presented within this paper in order toshow that a good agreement is obtained between the Galerkin PEEC,the PEEC based on razor blade testing, and a Method of Momentssimulation (MoM), which is applied for validation.Extended MagPEEC Model Including Dispersive MediumXiao Zhang; Haibo Long; Wenhua Chen; Yaqin Chen; and Zhenghe Feng,— Department of Electronic Engineering, Tsinghua UniversityThis paper presents an extended MagPEEC modeling technique usedto simulate arbitrary three-dimensional structures including a dispersivemedia. It remains the high precision of modeling with anacceptable increase in total computational complexity. This approachis verified by modeling a coaxial transmission line and magneticallyenhanced RFIC inductors up to multi-GHz, including the significantfrequency dependence of the permeability of the magnetic core inthis band. The efficiency of the proposed method is validated bycomparing its results with some commercial EM simulating software.The Error Reduced ADI-CPML Method for EMC SimulationIftikhar Ahmed; and Erping Li, — Institute of High PerformanceComputingIn this paper, convolutional perfectly matched layer (CPML) is developedfor the recently proposed error reduced (ER) ADI-FDTD©<strong>2007</strong> IEEE www.emc<strong>2007</strong>.org
EMC <strong>2007</strong> ADVANCE PROGRAM 37method to solve electromagnetic compatibility problems efficiently.Its numerical results are examined and compared with the conventionalADI-CPML method. It is found that for a CFL number equalto 5, the reflection error of the ERADI- CPML is approximately 12dB better than the conventional ADI-CPML method.Efficient 3D Simulation of Thin Conducting Layers ofArbitrary ThicknessGöran Eriksson, Saab Communication, Saab ABIn this paper it is demonstrated how a class of relatively complexEMC simulations can be performed at a low cost, both in terms oftime and money. Using a symmetric, two-way boundary conditionformulation, shielding metal layers can be included in a global electromagneticsimulation, without the need to resolve in detail theinterior of the layer. This formulation, which has been previouslyused for some specific microwave and EMC problems, has no restrictionson the ratio of layer thickness to the skin depth. It is implementedin a commercial finite element method (FEM) solverinstalled on a standard PC, and no source-code programming isrequired. The method is validated and its usefulness demonstratedby applying it to a number of 3D examples of general EMC relevance.Wide-Band Hybrid MM-PO Computational ElectromagneticsTechnique Using [Z] Matrix Interpolation and AdaptiveFrequency SamplingAndrzej Karwowski; and Artur Noga, — Silesian University of TechnologyIn this paper, we present a highly efficient computational electromagneticstechnique for wide-band analysis of antennas radiating inthe presence of electrically large conducting bodies (platforms). Thetechnique is based upon the well known Moment Method–PhysicalOptics (MM-PO) hybrid formulation combined with the impedancematrix interpolation and a dynamic adaptive frequency sampling ofthe desired observable. Numerical examples are given to demonstrateconsiderable savings in both computer memory and CPU timeoffered by the proposed approach.COMPUTATIONAL ELECTROMAGNETIC MODELING IIFast FDTD Simulation Using Laguerre Polynomials in MNAFrameworkKrishna Srinivasan; Ege Engin; and Madhavan Swaminathan, — GeorgiaInstitute of TechnologyIn this paper, a fast transient simulation scheme using Laguerre polynomials,called Laguerre-MNA, has been developed for FDTD andcircuit simulation. Companion models for the Yee cells and circuitcomponents have been derived, permitting the use of MNA analysisto perform FDTD/transient circuit simulations using the Laguerremethod. Companion models help simplify the matrix setup andreduce the matrix dimension that needs to be solved without employinglong cumbersome equations. The FDTD simulation usingLaguerre polynomials is unconditionally stable and has shown to bemuch faster than the conventional FDTD scheme. Prior work on transientelectromagnetic simulations using Laguerre polynomials has adrawback of being able to simulate only for a certain time-duration.A memory/time efficient solution has been proposed by which simulationcan be done for all time.Application of a Hierarchical SVD/ACA CompressionTechnique to Near-Field Calculations of Monopole AntennasMiguel Astner, TU Hamburg-Harburg; Heinz-D. Brüns, TU Hamburg-Harburg; Guido Bürger, HVB Systems GmbH; and Hermann Singer, TUHamburg-HarburgThis paper describes the concept of hierarchical matrices and theapplication to near-field calculations of voltage or power drivenantennas. The hierarchical matrix structure is based upon a binarypartition of the structure to be analyzed, where blocks of the matrixcan be represented as full matrices or R(k)-matrices, the latter yieldinga data reduced representation of the initial block. It has beenfound that the application of only the adaptive cross-approximation(ACA) matrix reduction technique gave bad results in many practical3D cases and failed to predict the physical current distribution. Theway out of this dilemma is to combine ACA with singular valuedecomposition (SVD), yielding reliable results again. The new compressionscheme turns out to be efficient and stable, and will bedescribed in detail. By means of examples, the validity of theapproach is demonstrated, where especially near-field investigationsare carried out.Efficient Evaluation of Equivalent-Principle Sources inMoM-FDTD Hybrid Method by Employing SpatialInterpolation and Adaptive SamplingAndrzej Karwowski; and Tomasz Topa, — Silesian University ofTechnologyThe MoM-FDTD hybrid approach requires the information to beexchanged back and forth between the MoM-regions and the FDTDregionscoupled through the Huygens’ surfaces. For electrically largestructures, evaluation of the electric and magnetic field componentsand the related equivalence-principle sources on the Huygens’ surfacescan represent a significant (even dominant) fraction of the totalsolution time required for the problem. In this paper, we demonstratea possibility of increasing the computational efficiency of theMoM-FDTD hybrid method by employing a spatial interpolationcombined with adaptive sampling in calculating the electric andmagnetic field components and the effective sources on the Huygens’surfaces. Numerical examples show that the proposed approach offersa considerable CPU time saving.Near Field - Far Field Conversion Based on GeneticAlgorithm for Predicting Radiation from PCBsHongmei Fan; and Franz Schlagenhaufer, — The University of WesternAustraliaA near field-far field conversion based on a genetic algorithm hasbeen performed for a printed circuit board with a ground plane. Arobust procedure for a pre-selection of dipole moments has beenintroduced. Important aspects of setting up the conversion problem,such as the number of equivalent dipoles and choice of matchingpoints, have been addressed.Use of Genetic Algorithms to Solve Inverse ScatteringProblemsDirk Plettemeier, Technische Universität Dresden; Stefan Balling, TechnischeUniversität Dresden; Diemo Landmann, N/A; and Karl-Heinz Gonschorek,Technische Universität DresdenThe inverse scattering problem described in this paper is part of thequasi-tomographic Comet Nucleus Sounding Experiment byRadiowave Propagation (CONSERT) of the comet-mission Rosetta.This part of the experiment is based on the utilization of radiationcoupling effects between the CONSERT antenna system on theRosetta-Lander and the subsurface structure of the comet nucleus inthe vicinity of the Lander. The scientific aim of this part of CON-SERT is the reconstruction of the subsurface structure at the landingsite, especially in view of the still open question: “Is a comet nucleussurround by a dust layer or not?” To solve this inverse scattering©<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
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