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Electromagnetic Compatibility, 2005. EMC 2005. 2005 International Symposium on

Date 8-12 Aug. 2005

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Displaying Results 1 - 25 of 74
  • Analysis of field through apertures by applying transmission line matrix method to electromagnetic topology simulations

    Page(s): 883 - 887 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (297 KB) |  | HTML iconHTML  

    Results from finite difference time domain simulation were compared with electromagnetic topology based simulation technique using transmission line matrix method for field penetration through the sub-wavelength apertures. Simulations show that electromagnetic topology technique can be applied for the analysis of electromagnetic fields penetration through apertures. Analysis also shows that the aperture size affects the temporal characteristics and frequency spectral components of the incident pulse. In addition, electromagnetic topology method results a reduction in the calculation grid by this technique results in enhanced simulation speed and less memory utilization. View full abstract»

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  • A novel technique for concurrent on & off - board EMI analysis of mixed RF-digital circuits via hybrid scattering patterns

    Page(s): 888 - 893 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (485 KB) |  | HTML iconHTML  

    We propose a hybrid scattering parameter matrix for concurrent on & off board EMI analysis of mixed RF-digital circuits. To start with, we first consider on-board EMI effects on digital circuits, particularly on an inverter to show the vulnerability of digital devices to RF interference and investigate both system and device level upsets due to adjacent EMI sources on printed circuit boards (PCBs). Next, we review port analysis technique to show the applications of S-parameter matrix for on-board EMI/EMC analysis. Subsequently, we extent the port analysis method with hybrid S-parameters to account for external field coupling to RF-digital circuit boards. In this context, we introduce a novel method in the frequency domain to circumvent CPU bottlenecks associated with time domain methods and yields increased accuracy as compared to transmission line theory. To do so, we present additional hybrid S-parameters that establish a link between the existing board ports and external plane wave. Thus, we can handle both on-board and off-board EMI problems simultaneously. The new hybrid S-parameter matrix is easily integrated into circuit solvers such as HSPICE and advanced design system (ADS, Agilent Technologies) and also allows both time domain and harmonic balance simulations of non-linear RF-digital components via broad-band network characterization. The proposed method was validated with full wave solvers and implemented for susceptibility analysis of an inverter, residing inside a metallic box, subject to a strong plane wave. View full abstract»

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  • Measurements and calculations of BPL emissions

    Page(s): 992 - 995 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    This paper describes the measurement techniques used by ARRL to make field-strength measurements in a number of BPL systems in the US. Those measurements showed BPL systems operating with emissions that ranged from well below to well above FCC emissions limits. ARRL also modeled a number of power-line configurations to determine what radiation patterns and emissions levels would be typical near power-line radiators. View full abstract»

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  • Efficient analysis of a two-dimensional GTEM cell

    Page(s): 906 - 910 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (629 KB) |  | HTML iconHTML  

    The contribution deals with the efficient numerical evaluation and with a systematic study of the electromagnetic field within a two-dimensional semi-infinite tapered TEM waveguide partially filled with an arbitrary object. The investigation of this geometry is of interest for the judgement of the reliability of GTEM cells, which are widely used in EMC practice for susceptibility measurements with relatively small devices under test (DUT). The method is a combination of a modal analysis of the field within the empty parts of the cell and a method-of-moments analysis within the part which contains the DUT. The method can also be an interesting alternative to efficiently simulate other mostly homogeneous waveguides having an arbitrary inhomogeneous section. The numerical evaluation includes a comparison of the surface currents induced on a DUT located either within the cell or within the free space. View full abstract»

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  • Solving low frequency electromagnetic problems with fast solvers

    Page(s): 811 - 816 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (772 KB) |  | HTML iconHTML  

    This paper researches on low-frequency scattering problem that has covered a large variety of models: simple PEC structure, PEC with wires and junctions, homogeneous penetrable scatterers and composite objects. Accurate numerical results have been generated for many demonstrating examples as well as practical application models. View full abstract»

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  • Calculation of radiated emission from the power line by 4-terminal pair network theory

    Page(s): 996 - 1001 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (469 KB) |  | HTML iconHTML  

    In order to obtain radiated emission characteristics from the power line, we measured the degree of unbalance to the earth and a leaked electric field from power line in high frequency band. The calculation model of power line is made by 4-terminal pair network theory, which has circuit constant as chain matrix of distributed constant on transmission line. The calculated value of TCTL (transverse conversion transmission loss) was mostly in agreement with measured value and then the validity of the calculation methods for TCTL was confirmed. The leaked electric field increases about 20 dB by grounding one of the pair line. View full abstract»

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  • A new frequency selective surface power plane with broad band rejection for simultaneous switching noise on high-speed printed circuit boards

    Page(s): 917 - 920 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB) |  | HTML iconHTML  

    A novel L-bridged frequency selective surface (FSS) power/ground planes is proposed with super-broadband rejection for simultaneous switch noise (SSN) from 600 Mz to 4.6 GHz. The L-shaped bridge design on the FSS power plane not only broadens the stop-band bandwidth, but also increases the mutual coupling between the adjacent FSS cells with allowing the significant decrease of the gap between the cells. It is found the small gap design can ease the degradation of the signal quality for the signal referring to the perforated FSS power plane. The excellent SSN suppression performance with keeping reasonably good signal integrity for the proposed structure is validated both experimentally and numerically. Good agreement is seen. View full abstract»

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  • Accelerating coupled circuit-EM simulation in the frequency and time domain

    Page(s): 823 - 827 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB) |  | HTML iconHTML  

    An accelerated, full-wave, coupled electromagnetic circuit simulation methodology is described. The simulator enables rapid modeling of high-speed effects in mixed-signal and RF circuits, and captures effects in both frequency and time domains. View full abstract»

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  • Laboratory measurement of voltage drop at an integrated circuit core due to parasitic inductances

    Page(s): 921 - 926 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (321 KB) |  | HTML iconHTML  

    The design of the power distribution systems (PDS) for an integrated circuit limits its performance due to the simultaneous switching noise (SSN) generated by the voltage drop across the system's parasitic inductances. This paper presents a method to make laboratory measurements that can characterize the instantaneous current draw of a sample integrated circuit (IC). This behavioral model is used in conjunction with a SPICE modeling of the PDS to bound the voltage drop seen at the IC's core. This characterization can then be used by IC packaging and PCB designers to determine optimum PDS design strategies. View full abstract»

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  • Incident-field measurement in proximity of wiring harness for radiated susceptibility assessment

    Page(s): 766 - 771 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (299 KB) |  | HTML iconHTML  

    This paper deals with the susceptibility of wiring harness of a complex system to radiated electromagnetic fields. In particular, the possibility of deducing information on the interfering field via experimental measurements is explored. The experimental procedure is intended to provide the inputs required for the definition of a new class of radiated susceptibility (RS) test procedures. It is shown that the field scattered from the wiring may substantially affect measurement accuracy of the incident field. The different roles played by the vertical and horizontal components of the scattered field are evidenced via simplified models. Practical guidelines are provided for the sensor positioning, based on statistical estimates of the measurement error. Reliability of field measurements for RS assessment is investigated by employing a numerical electromagnetic solver as a virtual measurement system. View full abstract»

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  • Experiment study on radiation characteristics of corona discharge on hardware

    Page(s): 840 - 843 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (205 KB) |  | HTML iconHTML  

    Characteristics of electromagnetic wave radiated from corona discharge on hardware has been studied. Experiment results and analysis show that the physical model of corona discharge on hardware can be simulated by a short dipole antenna and the electrical field above ground is a superposition field due to ground reflection. View full abstract»

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  • System level EMC - from theory to practice

    Page(s): 741 - 743 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    This article discusses the vast importance of incorporating electro-magnetic compatibility (EMC) engineering as an inseparable part of system engineering in a complex, technologically-advanced, tight-scheduled military project, starting from the project proposal stage (in response to a request for proposal-RFP), down to co-siting impacts tests in the platform. The project's product is defined as an operational prototype. On one hand, this prototype proves the system's functional properties as were specified by the customer, while on the other hand serving as a first article that is required to withstand all of the environmental conditions as a serially-produced system, including full EMC requirements. The unique system which is being addressed here has multiple, diverse capabilities and is comprised of elements and units belonging to various families, e.g., electronic boxes, electro-optical units, inertial sensors, functional display, computer, etc. The units are based on home-developed and commercial off-the-shelf (COTS) units (military as well as civilian/industrial). Furthermore, we present the methodology that was employed to minimize problems/failures during system EMC tests, in both the laboratory and after installation in the platform. View full abstract»

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  • Evaluating uncertainties in net power delivery using dual directional couplers

    Page(s): 782 - 786 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (199 KB) |  | HTML iconHTML  

    Directional couplers are used extensively to monitor power flow in a transmission line. It is essential to evaluate measurement uncertainties of the power delivery systems for many RF applications. For example, in a field probe calibration process, accurate net power measurements are needed to establish the standard fields. This paper employs the complete model equation (using the full four-port S-parameters of the coupler) to evaluate the measurement uncertainties in the net power. Uncertainties can also be estimated with scalar quantities when vector quantities are not available. In such a case, one can use the scalar coupling coefficients, VSWR and/or directivities of a coupler, and assume random phases to derive an uncertainty budget. On the other hand, when both the vector S-parameters of the coupler and the complex reflection coefficients of the load are known, the net power can be determined exactly using the full model equation. View full abstract»

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  • Radiated emission from a PCB with an attached cable resulting from a nonzero ground plane impedance

    Page(s): 955 - 960 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (410 KB) |  | HTML iconHTML  

    In this paper, radiated emission from a PCB with an attached cable resulting from a nonzero ground plane impedance is studied experimentally and with FDTD modeling. Frequency responses of the CM current, the electric field near the PCB, and the electric far field are investigated. First, the effect of a thin wire to mimic an interconnected ground wire is discussed. Comparing the cases with and without the thin wire, the difference is only at the resonance frequency, and there is no change on the magnitude of the CM current. Second, the effect of a termination on EMI coupling-path that results from the nonzero ground plane impedance is discussed. When the terminating resistor is smaller than the nonzero impedance, EMI antenna is driven as current-driven. Therefore, for relatively low impedance load such as 51 Ω, EMI antenna is driven as voltage-driven at lower frequency. As the terminating resistor is larger, the CM current becomes larger at lower frequencies (10∼100 MHz). This indicates that a high impedance load such as a logic IC results in larger radiation at lower frequency. View full abstract»

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  • Reducing radiated emissions from CPUs core power interconnect design

    Page(s): 927 - 932 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (399 KB) |  | HTML iconHTML  

    Radiated emissions associated with the second harmonic of the CPU core operating frequency often prove problematic throughout the design of computer systems. One of the primary radiating mechanisms for the second-harmonic emissions is high-frequency harmonic current injected from the CPU directly into the computer power distribution system (PDS). Prom the PDS, the current can couple to and radiate from other devices and/or radiate directly from the PCB. To mitigate the emissions from such current injection, as much current as possible must be kept from reaching the PCB. In this work, the design of the core-power interconnect for a CPU is modified to limit the level of high-frequency current injected into the PCB PDS. The design is driven by analyzing the parasitics associated with the PDS. A reduction of more than 12 dB in the radiated fields is achieved through a geometric redesign of the CPU socket interconnect. View full abstract»

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  • A hybrid approach to decrease port influence in transmission line characterization

    Page(s): 684 - 689 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (334 KB) |  | HTML iconHTML  

    Characterization and models for multi-gigabit signaling is an important issue in modern digital system. A good physical based model relies on a precise characterization of the test board. Typically, the characterization of the test board is associated with scattering matrix parameter measurement, which can be done with a VNA (vector network analyzer) in the frequency-domain or a TDR (time domain reflectometer) in the time-domain. The commonly used launch techniques on PCBs (printed circuit boards) associated with the VNA or TDR measurement in the microwave frequency range use SMA or 3.5 mm connectors, in edge-launch or vertical-launch fashions. The transition between the launch port and the DUT (device under test) introduces errors in the measurement. Embedding/de-embedding techniques are used to remove the port influences in the measurement generally. For example, TRL (through, reflect, and line) calibration is the typical method used in measurement to eliminate port influences. However, extra test kits are needed for TRL calibration, and furthermore the TRL calibration is sometimes difficult to implement, such as in coupled differential lines. In this paper, an effective hybrid approach for transmission line characterization is proposed, which includes choosing a suitable port launch technique for the test board, port parasitic parameters estimation, and building up a proper circuit model for evaluation with genetic algorithms (GA). View full abstract»

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  • The measurement of broad band over power line emissions

    Page(s): 988 - 991 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (213 KB) |  | HTML iconHTML  

    This paper is a report on measurements taken of broadband over power line (BPL) signals at two US test sites in October 2004. The investigation sought to: (1) discriminate between BPL emissions and power line noise in the near field; (2) determine the maximum level of magnetic field intensity levels (H FIELD) at a given distance in the near field and (3) utilizing the CONCEPT II method of moments routine develop a numerical electromagnetic model of the power line emission (Hy and Ex ) characteristics. View full abstract»

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  • Feasibility of new nanolayered transparent thin films for active shielding of low frequency magnetic field

    Page(s): 900 - 905 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1000 KB) |  | HTML iconHTML  

    The feasibility of low-frequency magnetic field active shielding by using transparent metals is investigated. The basics of transparent metals and of the nanotechnology exploited to realize a test sample made of silver and titanium oxide are provided. The design of the shield is carried out by evaluating the maximum current capability of the transparent metal as function of the working temperature in order to assess the performance of the proposed new active shielding technique, which avoids the use of bulk conductors for the current flow. The sensitivity analysis of the efficiency of the transparent active shield proposed is performed by numerical simulations, considering a 2D-test enclosure with an optical aperture, excited by an inner a.c. current source at 50 Hz. View full abstract»

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  • EMI controlling in a rugged launch computer

    Page(s): 721 - 725 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (767 KB) |  | HTML iconHTML  

    Developing of a rugged launch mobile computer system in rack mountable form is not an easy task. If the system is going to be used in a stringent EMI environment, then achieving the EMC is a challenging task for the designers and EMI engineers. Initially the system did not qualify to met all the EMC requirements even after implementing the possible EMC measures in the design and development Achieving EMC by design is must. The EMC engineers analyzed the design concept of the system and its failures during EMI/EMC performance evaluation. In this paper the authors mainly highlighted and expressed their views about the incorporation of EMC measures, fixes and final achievement in qualifying the system. The authors also explained the electromagnetic compatibility achievement. The sequence adapted in achieving EMC is explained. View full abstract»

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  • UG filtering - an effective technology against IEMI and HPM

    Page(s): 844 - 846 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (359 KB) |  | HTML iconHTML  

    Developing and verification of new technology for filtering of ultra high frequencies range (above 1 GHz), called "UG series", is presented in this paper. UG technology is implemented in protection systems against high power microwave (HPM) electro-magnetic field, and in filtered connectors that must be able to filter those frequencies. This technology is the best answer yet high cost effective for all types of signals, including power lines, video & audio lines, communication, balanced and unbalanced. These lines require significant attenuation at very high frequencies. View full abstract»

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  • Effective use of EMC analysis tools in the automotive product development process

    Page(s): 744 - 749 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (398 KB) |  | HTML iconHTML  

    The pressures of today's markets cause suppliers of automotive electronics to find better ways of developing products. The use of analysis is a highly effective way to bring compliant product to the market place, en time. A workflow is proposed to guide an engineering team through the arduous task of developing a product with often fewer resources and time available than ever before. Predictive analysis provides the ability to create 'virtual' board iterations, saving tune, and costs of development. Additionally, analysis is effective at creating product 'blueprints' and making them available for later design re-use. View full abstract»

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  • Reduced unknowns meshing for the partial element equivalent circuit approach

    Page(s): 805 - 810 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (327 KB) |  | HTML iconHTML  

    In this paper, we present an overview of techniques for meshing EMC and signal or power integrity problems for the PEEC method. For these problems, the geometries usually consist of complex heterogeneous mixed circuit and electromagnetic structures. Hence, these structures include different complex mixed electrical and electromagnetic details unlike, for example, a more homogeneous scattering problem. One of the issues of interest are minimizing the complexity of the meshing while preserving sufficient accuracy. We consider some of the fundamental mixed-problem meshing issues and some of the algorithmic issues which are important for this class of problems when the partial element equivalent circuit approach is applied. View full abstract»

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  • Domain decomposition and multi-scale finite elements for electromagnetic analysis of integrated electronic systems

    Page(s): 817 - 822 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (257 KB) |  | HTML iconHTML  

    A finite element methodology is presented for computer-aided analysis and design of the interconnect and power distribution network of integrated, packaged electronic systems. The concept of multi-scale finite elements is introduced to describe the generalization of the traditional finite element, understood as a small finite volume of the computational domain over which the unknown field quantity is approximated in terms of interpolate polynomial functions, to a generalized, electromagnetic behavior-baring, scaleable, mathematical macro-model, which captures the electromagnetic response of a sub-region of the computational domain, in a manner seamlessly compatible with the finite element modeling infrastructure. Such generalized finite elements, combined with a domain decomposition methodology suitable for multi-layered electronic substrate electromagnetic modeling, help enhance the modeling versatility and applicability of finite elements to integrated electronic system modeling. View full abstract»

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  • Improving the behavior of PCB power-bus structures by an appropriate segmentation

    Page(s): 961 - 966 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (217 KB) |  | HTML iconHTML  

    An effective and cost efficient method for suppressing cavity mode resonances within the power-bus of high-speed printed circuit boards is presented. It is shown that resonant modes can be completely suppressed by segmenting the power-bus into rectangular parts of smaller dimensions and connecting these parts suitably. For the case of identically shaped segments a double summation expression of the resulting voltage distribution within each part is derived. Furthermore, the impact of different connections between the segments is investigated. The theoretical results are well confirmed by measurements. View full abstract»

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  • Influence of ground plane to distance dependence leaked electric field from power line

    Page(s): 1008 - 1013 Vol. 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (755 KB) |  | HTML iconHTML  

    In this paper, we focused attention on the system that used the MHz band in a power line communication, and calculated the influence of electric condition of ground plane to distance dependence and electric field distribution of leaked electric field by method of moments. As a result, we understood the standard ground attenuated leaked electric field to distance as not 20 dB/dec but 40 dB/dec. And we understood the almost uniform attenuation in the standard ground independency of direction from the electric field distribution. View full abstract»

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