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Electromagnetic Compatibility, IEEE Transactions on

Issue 4 • Date Nov. 1982

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Displaying Results 1 - 16 of 16
  • Table of contents

    Page(s): c1
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  • IEEE Electromagnetic Compatibility Society

    Page(s): c2
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  • LORAN-C Positioning Errors Caused by Scattering from Wires Above the Earth

    Page(s): 381 - 388
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    In this paper, the scattering of a LORAN-C navigation signal by a powerline is calculated. The results of the derivation can be used to predict positioning errors for land-based applications of LORAN-C, such as vehicle-location schemes. The only assumptions are that the line spacing is small compared to its height and that the LORAN-C signal is narrow band, and not incident at a grazing angle. From this general result, a very simple theory for predicting positioning errors is derived which is valid for most parameters of interest. It is found that, when a LORAN-C receiver is located near a powerline, position errors of 1 km are possible. This value is in accord with published experimental results. Further, it is shown that position errors are significantly greater when the LORAN-C signal approaches the transmission line at a small angle. View full abstract»

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  • A New Method of Calculating 3-Meter Site Attenuation

    Page(s): 389 - 397
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    A new method of calculating 3-m site attenuation is described. To obtain an accurate site-attenuation curve, the problem of coupling between antennas is formulated in the form of coupled integral equations for the antenna currents, and solved by the method of moments (MOM). The site-attenuation curve thus obtained shows about 1.3-dB larger attenuation than that given in an IEC document. The deviations in the site-attenuation curve due to the impedance mismatch between the coaxial cable and the measuring equipment, and the influence of the antenna conductor radius on the attenuation curve are also considered. Finally, the calculated site attenuation is compared with the measured attenuation data available in the literature. View full abstract»

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  • A Novel Method to Analyze Electromagnetic Scattering of Complex Objects

    Page(s): 397 - 405
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    The finite-difference time-domain (FD-TD) method is proposed as a means of accurately computing electromagnetic scattering by arbitrary-shaped extremely complex metal or dielectric objects excited by an external plane wave. In the proposed method, one first uses the FD-TD method to compute the near total fields within a rectangular volume which fully encloses the object. Then, an electromagnetic-field equivalence principle is invoked at a virtual surface of this rectangular volume to transform the tangential near scattered fields to the far field. To verify the feasibility of this method, the surface currents, near scattered fields, far scattered fields, and radar cross section of two canonical two-dimensional objects are presented. For these cases, it is shown that the FD-TD method provides magnitude of current and field predictions which are within ± 2.5 percent and further phase values within ± 30 of values predicted by the method of moments ( MOM) at virtually every point including in shadow regions. View full abstract»

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  • Finite-Difference Analysis of EM Fields Inside Complex Cavities Driven by Large Apertures

    Page(s): 406 - 410
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    This paper is an application of the equivalence principle to the problem of predicting the fields inside aperture-driven cavities. This approach allows the prediction of the fields penetrating large apertures into complex cavities using the finite-difference analysis procedure. View full abstract»

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  • A Comparison of Lightning Electromagnetic Fields with the Nuclear Electromagnetic Pulse in the Frequency Range 104-107 Hz

    Page(s): 410 - 416
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    The electromagnetic fields produced by both direct lightning strikes and nearby lightning are compared with the nuclear electromagnetic pulse (NEMP) from an exoatmospheric burst. Model calculations indicate that, in the frequency range from 104 to near 107 Hz, the Fourier amplitude spectra of the return stroke magnetic fields near ground 1 m from an average lightning strike will exceed that of the NEMP. Nearby first return strokes at a range of about 50 m, if they are severe, produce electric-field spectra near ground which exceed that of the NEMP below about 106 Hz, while the spectra of average nearby first return strokes exceed that of the NEMP below about 3 x 105 Hz. Implications of these results for aircraft in flight are discussed. View full abstract»

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  • Safety-Margin Measurements of Electroexplosives: DC-RF Power-Substitution Method

    Page(s): 416 - 419
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    Some of the indirect methods in current use for measuring the safety margins of installed electroexplosives are briefly reviewed. The basic requirements of the military specifications are indicated. A direct measurement of resistance variation versus dissipated power, on actual devices, is proposed as a better alternative. The method provides the capability of measuring unmodified real electroexplosives with some temperature coefficient, and also indicates a new utilization of SEM fuses and deactivated EED's for quantitative measurements. View full abstract»

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  • "Rusty Bolt" Demonstrator

    Page(s): 420 - 421
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    A simple modification to an ordinary AM transistor pocket radio is described which permits demonstrations of random nonlinear junction ("Rusty Bolt") effects between pieces of lightly contacting metal. View full abstract»

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  • Contributors

    Page(s): 422 - 423
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  • 1982 Technical Reviewers

    Page(s): 424 - 425
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  • Author index

    Page(s): 426 - 427
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  • Subject index

    Page(s): 427 - 430
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  • EMC Society Policy

    Page(s): [430]-a
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  • Institutional listings

    Page(s): 430b
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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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Swiss Federal Institute of Technology (EPFL)
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