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Electromagnetic Compatibility, IEEE Transactions on

Issue 4 • Date Nov 1996

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Displaying Results 1 - 10 of 10
  • EM fields of a phased line current over a conducting half-space

    Page(s): 608 - 611
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB)  

    The need often arises to predict the electromagnetic field of power and communication lines over the earth. A simple and explicit derivation is given for the electromagnetic fields of a travelling current line source located over a layered conducting half-space. Special attention is paid to the case of a homogeneous half-space where analytical closed-form expressions can be obtained. Of some interest is the radiation of a vertically polarized radio ground wave which would not be present if the line source was uniform View full abstract»

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  • An innovative EMI reduction design technique in power converters

    Page(s): 567 - 575
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (752 KB)  

    The present paper deals with the problem of reducing electromagnetic interference (EMI) of switched-mode power converters using gate controlled devices such as IGBTs and power MOSFETs. In order to reduce power losses, these systems rely on fast on/off time pulses, thus producing emissions due to the high-frequency spectral content of pulses. An original design method for switched-mode power supplies is developed allowing to obtain an acceptable compromise between power losses and EMI. Emphasis is placed on the analysis of the commutation cell of the switching static converter in order to demonstrate that it is possible to control the emissions of the device by handling the parameters of the driver circuit. Theoretical analysis is discussed and compared with experimental results of the investigation on the spectrum amplitude of the emissions View full abstract»

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  • Interaction of a vertical line current with a horizontal cable over a perfectly conducting plane

    Page(s): 605 - 607
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    A self-contained canonical solution is obtained for the currents excited on an overhead cable by a vertical line of current of finite height. Particular attention is paid to the quasistatic limit where a transmission line description of the source-to-cable coupling emerges. The case where the cable is a coaxial structure is also treated in an explicit fashion View full abstract»

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  • Figure of merit for low frequency anechoic chambers based on absorber reflection coefficients

    Page(s): 576 - 584
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    Return loss as a function of frequency and angle of incidence is studied to determine the effectiveness of the absorbing material used in an anechoic chamber. This alone is not enough to determine a figure of merit for an anechoic chamber or to compare the figure of merit for one anechoic chamber to that of another. While the information gained from return loss calculations and measurements as a function of angle of incidence is valuable, an overall measure of anechoic chamber effectiveness is necessary in order to compare different designs. In this paper, a new chamber figure of merit which is based on the decay time of the chamber is introduced. This decay time is, in turn, based on the average power absorbed by the chamber walls. The resulting model is simple and does not require intensive numerical computation. Calculations of the figure of merit for anechoic chambers which contain different types of absorbing materials are shown, and calculated and measured values of decay time for a primary standards calibrations facility are compared View full abstract»

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  • Deep field penetration into a conducting cylinder

    Page(s): 549 - 556
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    In this paper we investigate the penetration of both E and H waves into a cylinder of arbitrary cross section (characteristic dimension L). The material of the cylinder is a nonmagnetic good conductor, and we examine the limits of deep penetration (small L/δ, where δ is the penetration depth) and small quality factor Q=(ωε0/σ). These two asymptotic conditions imply a low-frequency situation, for which we derive formulas for the induced currents and associated Joule and radiation losses View full abstract»

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  • Radiated interference from a high voltage impulse generator

    Page(s): 600 - 604
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    High voltage switching operations radiate large electromagnetic fields. These cause interference to sensitive electronic equipment. For example, the environment of most concern are those of high voltage substations and high voltage research laboratories. This paper evaluates electric and magnetic field measurements obtained during the breakdown of an SF6 gas gap when a 4/400 μs pulse was applied from a high-voltage impulse generator. Building upon previous work concerning initial results in terms of the E-dot and H-dot measurements, this paper also includes the evaluation of the E and H field magnitudes to determine the extent of equipment interference within the vicinity of switching/pulse operations. In addition, these laboratory results were extrapolated to allow comparisons to be made with results from previous studies investigating switching operations within a substation environment. The implications regarding EMC immunity standards and the level of interference is discussed View full abstract»

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  • Investigation of fundamental EMI source mechanisms driving common-mode radiation from printed circuit boards with attached cables

    Page(s): 557 - 566
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    Fundamental EMI source mechanisms leading to common-mode radiation from printed circuit boards with attached cables are presented in this paper. Two primary EMI source mechanisms have been identified: one associated with a differential-mode voltage and another associated with a differential-mode current, both of which result in a common-mode current on an attached cable. These mechanisms can he used to relate printed circuit layout geometries to EMI sources. The two mechanisms are demonstrated through numerical and experimental results, and an example from a production printed-circuit design is presented View full abstract»

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  • Breakout box and circuits for direct injection experiments of electromagnetic susceptibility of aircraft electronics

    Page(s): 592 - 599
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    Often the determination of the electromagnetic susceptibility of an aircraft's electronics includes direct injection experiments. In that case, an interfering signal, possibly CW and/or transient in nature, is applied directly to the data bus and signal lines of the aircraft system under test. In the past, the frequency or spectrum of the injected signal was typically in the VHF regime and lower (<150 MHz). Recently, susceptibility of aircraft components to signals with spectrums to 1 GHz and higher have been of interest. Application and measurement of signals in these frequency regimes must he made with greater care since cable and component physical and electrical lengths can become significant fractions of a wavelength at the highest frequencies of interest. This paper describes a breakout box designed for narrow and wideband high-voltage direct injection experiments of aircraft 1553 bus systems to 1 GHz and higher. A description is given of the breakout box. Also presented is the design and analysis of the direct injection circuit, the voltage and current sensors, and the high-voltage wideband divider board. Frequency domain characterizations of the circuits are presented, and an example of wideband transient pulse injection, measurement, and compensation using the breakout box is given View full abstract»

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  • Moment method analysis of the magnetic shielding factor of a conducting TM shield at ELF

    Page(s): 585 - 590
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    This paper presents an integral equation and method of moments (MoM) solution to the problem of TM transmission by a metallic conducting shield at extremely low frequencies (ELF). In order to accurately compute the total fields interior to the shield, equivalent problems are formulated which avoid the numerically difficult problem of computing the total fields as the sum of the incident plus scattered fields. In particular, the total electric field on the interior surface of the shield is obtained by a volume current equivalent problem, and then the total magnetic field interior to the shield is formulated in terms of equivalent magnetic surface currents flowing on the interior surface of the shield replaced by a perfect conductor View full abstract»

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  • A reflection coefficient derivation for the Q of a reverberation chamber

    Page(s): 591 - 592
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    Reverberation chambers (also called mode-stirred chambers) are multimoded cavities that are used for radiated emissions or immunity measurements. A reflection coefficient method is used to derive the quality factor (Q) of reverberation chambers of arbitrary shape. The results are applicable to walls of general materials, but reduce to the previous result for highly conducting walls with small skin depth. The reflection coefficient method is also used to derive the decay time of reverberation chambers View full abstract»

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Aims & Scope

IEEE Transactions on Electromagnetic Capability publishes original and significant contributions related to all disciplines of electromagnetic compatibility (EMC) and relevant methods to predict, assess and prevent electromagnetic interference (EMI) and increase device/product immunity.

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Meet Our Editors

Editor-in-Chief
Professor Farhad Rachidi
Swiss Federal Institute of Technology (EPFL)
EMC Laboratory
CH-1015 Lausanne
Switzerland
Phone: +41 (0) 21 693 26 20 (direct)
+41 (0) 21 693 26 61 (secretariat)
Fax: +41 (0) 21 693 46 62
Email: Farhad.Rachidi@epfl.ch
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