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Electromagnetic Compatibility, IEEE Transactions on

Issue 3 • Date Aug. 1982

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Displaying Results 1 - 24 of 24
  • Table of contents

    Page(s): c1
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  • IEEE Electromagnetic Compatibility Society

    Page(s): c2
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  • EMC Symposiums

    Page(s): 293
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  • Electromagnetic-Field Distortion Due to a Conducting Rectangular Cylinder in a Transverse Electromagnetic Cell

    Page(s): 294 - 301
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    This paper deals with the distortion effects in a TEM cell resulting from loading by the object under test. To insure that higher order modes are ruled out as contributing factors, a brief discussion of the cutoff frequencies of these modes is presented. The paper then proceeds to a theoretical and experimental analysis of the loading effects. In the theoretical analysis for the loading effects, i.e., the electromagnetic-field distortion caused by an object under test in a TEM cell, the frequency-domain integral equation for the magnetic field, or equivalently, the current density on the surface of a perfectly conducting cylinder in a parallel-plate waveguide, is solved by the method of moments to predict the degree of magnetic-field distortion. The experimental investigations are performed by mounting a number of electrically small half loops on the surface of the conducting cylinder in a TEM cell. The loading effects in terms of magnetic-field distortion are analyzed as the ratio of one of the object dimensions (height) to the separation distance between the inner conductor and the ground plane of the TEM cell. Also, the response of an electrically small loop to both the magnetic and electric components of the electromagnetic field is used to measure the phase relation between the magnetic and electric fields, which in turn can be used to determine the degree of degradation of the TEM mode due to the presence of the conducting cylinder. These theoretical and experimental results are compared with the available quasi-electrostatic results. View full abstract»

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  • Calculation of Site Attenuation from Antenna Factors

    Page(s): 301 - 316
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    A site-attenuation model expressed in terms of the antenna factors of the transmit and receive antennas is presented. Both horizontal and vertical polarizations are included, as are the effects of mutual coupling between closely spaced horizontal antennas. Expressing site attenuation in terms of antenna factors allows the use of broad-band antennas with their attendant advantages over tunable dipoles. Measured and calculated results for a variety of sites, antennas, and geometries are compared in the frequency range of 30 MHz to 1 GHz. View full abstract»

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  • Standard-Site Method for Determining Antenna Factors

    Page(s): 316 - 322
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    A method for calibrating antennas from site attenuation measurements made on an open-field site is described. The method, termed the standard-site method because the accuracy of the results depends on the quality of the measuring site, requires neitller the use of a standard antenna nor the generation of a standard field. The antenna factors of a number of broad-band antennas calibrated by the standard-site method over the frequency range 30¿1000 MHz show good agreement with the antenna factors found by the standard-antenna method. View full abstract»

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  • Measurements of Electromagnetic Radiation from Automotive Ignition Systems

    Page(s): 323 - 330
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    This paper reports a set of measurements of automotiveingnition-system electromagnetic radiation (EMR). The measurements were obtained in terms of external antenna noise figure and voltage deviation. A variety of vehicle EMR sources were studied at 4 relatively widely separated frequencies. Two independent measurement methods were used, each involving a separate statistical signal-processing procedure. The results of these two measurements compared quite favorably. These measurements provide data in support of an earlier paper in which a model is presented for assessing the statistical significance of the inteference of EMR sources. That model calls upon a widely respected data base for man-made interference which is published by the Institute of Telecommunication Science of the National Bureau of Standards. View full abstract»

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  • Evidence for the Conversion of Noise Envelope Statistics by Radio Propagation Processes

    Page(s): 330 - 334
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    Results of experiments that bear upon the hypothesized transformation of impulsive noise envelope statistics are presented and interpreted in light of the existing theory. In particular, recently published data by Sheikh and Parsons are found to be consistent with the envelope conversion concept. View full abstract»

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  • On the Superposition of Inductive and Capacitive Coupling in Crosstalk-Prediction Models

    Page(s): 335 - 343
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    An examination of traditional low-frequency crosstalk-prediction models is presented. From the exact solution of the transmission-line equations for a 3-conductor line, it is shown that superimposing crosstalk contributions due to mutual inductance and mutual capacitance between the two circuits is valid for a sufficiently small frequency. The widely held notion that one may superimpose the effects of both mutual and self elements ( inductance and capacitance) is shown to be incorrect. View full abstract»

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  • Voice Communication System Performance in the Presence of Automotive Ignition Noise

    Page(s): 344 - 348
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    This paper reports on recent measurements of voice system performance in a controlled automotive ignition noise environment. At a quiet measurement site in the vicinity of Tucson, AZ, various combinations of from 1 to 12 vehicles of various ages, types, and manufacture were used to provide impulsive interference to four-voice communication system types. These systems were SSB at 23 MHz, with a 10-kHz bandwidth, FM at 75 MHz with a 30-kHz bandwidth, AM at 300 MHz with a 30-kHz bandwidth, and a FM/ PCM system at 900 MHz with a 300-kHz bandwidth. The statistical characterisitcs ( amplitude probability distribution of the received noise envelope and the average crossing-rate characteristics) of the interference were measured simultaneously with the system performance. Two methods were used to measure system performance. An objective measurement using instrumentation termed voice intelligibility analysis system ( VIAS) was used which produces an intelligibility measure called articulation index ( Al). In addition, a subjective method was used employing phonetically balanced word lists and a highly trained listener panel to obtain the articulation score ( AS). One object of the measurements was to ascertain if a relationship exits between Al and AS for impulsive noise, and, indeed, quite good correlation was obtained for all four systems. The results of the system performance measurements and associated results are presented and discussed in detail in this paper. View full abstract»

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  • Experimental Investigation of the Rhombic EMP Simulator: Comparison with Theory and Parallel-Plate Simulator

    Page(s): 349 - 355
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    The rhombic wire simulator is investigated experimentally and compared at low, intermediate, and high frequencies with both the previously derived theory and the Harvard EMP simulator with its central parallel-plate section and tapered metal- plate feeding and loading ends. Agreement with theory is very good. Similarities and differences are observed between the fields in the working volumes of the rhombic wire and the metal-plate simulators. In general, the rhombic wire simulator provides a field more nearly like that of a traveling transverse wave in unbounded space. View full abstract»

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  • Using Free-Space Transmission Loss for Evaluating Anechoic Chamber Performance

    Page(s): 356 - 358
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    Performance of a rectangular RF anechoic chamber is evaluated by measuring the relative insertion loss versus separation distance between the sources of chamber illumination and small dipole or open waveguide antennas on a particular measurement axis. Measured data are compared to free-space transmission loss calculated using finite-range source antenna gains. A lack of fit between measured insertion loss and calculated transmission loss is a measure of reflections from chamber surfaces assuming the finiterange gain calculations are exact for the separation distances considered. Experimental results show excellent agreement between a smooth-curve fit to the measured data and the calculated free-space data. Standard fields in this chamber are used for calibrating hazard meters and dipole antennas used for field-strength measurements. View full abstract»

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  • Sensitivity of Crosstalk in Twisted-Pair Circuits to Line Twist

    Page(s): 359 - 364
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    The prediction of crosstalk induced in an unbalanced twisted pair by an adjacent transmission line is investigated. The induced voltage at one end of the twisted pair is shown, experimentally, to be extremely sensitive to twist for low-impedance loads and relatively insensitive to twist for high-impedance loads. Ex- perimental results are given which show that a slight rotation of one end of the twisted pair ( no more than 1800) can cause a change of as much as 35 dB in the induced voltage. The consequence of these results is that, in a practical situation, one would therefore not be able to predict this crosstalk for low-impedance loads with any con- sistency. A simple model explaining these results is given. View full abstract»

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  • The Cylindrical Dipole as a Sensor or Probe

    Page(s): 364 - 367
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    The cylindrical dipole is shown to be frequency-independent over the range of electrical lengths kh ' 1 for resistive loads in the range 3.77 -' RL C 377 fl when used to measure the time derivative of the electric field. It can also be used to measure the electric field in the frequency domain and used as a standard for calibrating sensors with regard to their frequency independence over selected ranges of frequency. View full abstract»

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  • Measured Spectral Amplitude of Lightning Sferics in the HF, VHF, and UHF Bands

    Page(s): 368 - 369
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    An experimental study was carried out to measure the spectral amplitude of lightning sferics at 22.5 MHz, 225 MHz, and 2.25 GHz. This effort included the detection, storage, and analysis of RF emission data to determine accurately the relative electric-field strength produced by the lightning associated with a typical local thunderstorm. These measured spectral amplitudes are normalized and plotted relative to similar data from other investigators. These data support a l/f2 to 11f3 slope for sferics at frequencies above the HF range. View full abstract»

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  • Potential Variations Arising Out of a Periodic Lattice of Isolated Logarithmic Singularities

    Page(s): 370 - 372
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    This correspondence alludes to two recent publications [2], [3] which have developed two entirely distinct formulations for tapping spurious Compton electron emanating from the walls of system-generated EMP simulators. While both formulations recognize the predominant role played by the potential field, no attempt was made in either paper to estimate the relative error involved in pursuing the efficient analysis of the GJT paper [2]. This article does such an analysis based on the variations in the potential field as the parameters of the periodic lattice are changed. This would help the designer to choose between the two techniques¿the efficient one with parametric limitations or the more involved one with a large measure of parametric freedom. View full abstract»

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  • Contributors

    Page(s): 373 - 374
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  • International Aerospace and Ground Conference on Lightning and Static Electricity

    Page(s): 375 - 376
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  • IEEE 1983 International Symposium on Electromagnetic Compatibility

    Page(s): 377
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  • 1984 International Symposium on Electromagnetic Compatibility IECE & IEE of Japan IEEE EMC-S October 16 -18, 1984/Tokyo

    Page(s): 378
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  • Now is the Best Time to Join our Society

    Page(s): 378-a
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  • An Essential Reference Book for Those Who Need to Keep Abreast of Electrotechnology

    Page(s): 378-b
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  • EMC Society Policy

    Page(s): 378-c
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  • Institutional listings

    Page(s): 378d
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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.

Full Aims & Scope

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
url: http://emc.epfl.ch