المؤلفون: Papadopoulos, Theofilos A.¹ (AUTHOR) thpapad@ee.duth.gr, Datsios, Zacharias G.² (AUTHOR) zdatsios@auth.gr, Chrysochos, Andreas I.³ (AUTHOR) achrysochos@fulgor.vionet.gr, Mikropoulos, Pantelis N.² (AUTHOR) pnm@eng.auth.gr, Papagiannis, Grigoris K.² (AUTHOR) grigoris@eng.auth.gr

المصدر: IEEE Transactions on Electromagnetic Compatibility. Feb2021, Vol. 63 Issue 1, p259-267. 9p.

مصطلحات موضوعية: ELECTROMAGNETIC wave propagation, TRANSIENT analysis, SOILS, ELECTRIC lines, CABLES

مستخلص: The accurate estimation of the influence of the imperfect earth on the propagation characteristics of conductors is a crucial issue in electromagnetic (EM) transient analysis. In this aspect, the frequency-dependence of the soil electrical properties should be also considered. The effects of the dispersion of soil electrical properties on EM propagation have been investigated mostly for overhead transmission lines. This article presents a detailed EM transient analysis of underground cable systems taking into consideration the frequency-dependent (FD) soil properties. A generalized earth formulation of cable earth return impedance and shunt admittance is adopted. Propagation characteristics and transient responses are calculated by using both FD soil models and constant soil properties, as well as approximate earth formulations, neglecting the influence of the imperfect earth on shunt admittances; significant differences are observed. Guidelines for the accurate evaluation of earth conduction effects on the transient performance of underground cable systems are also introduced. [ABSTRACT FROM AUTHOR]

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المؤلفون: Stumpf, Martin¹, de Hoop, Adrianus T.²

المصدر: IEEE Transactions on Electromagnetic Compatibility. Aug2018, Vol. 60 Issue 4, p885-889. 5p.

مصطلحات موضوعية: SIGNAL processing, ELECTROMAGNETIC wave propagation, TIME-domain analysis, ELECTROMAGNETIC interference, PLASMONICS

مستخلص: A full analytic time-domain analysis is presented for a canonical problem of electromagnetic interference related to the operation of integrated-circuit devices at optical frequencies, where metal screens and substrates can no longer be characterized as perfect electrical conductors, but the plasmonic behavior of conduction electrons in the metal has to be taken into account. [ABSTRACT FROM PUBLISHER]

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المؤلفون: Drikas, Zachary B.¹, Gil Gil, Jesus¹, Hong, Sun K.¹, Andreadis, Tim D.¹, Yeh, Jen-Hao², Taddese, Biniyam T.², Anlage, Steven M.²

المصدر: IEEE Transactions on Electromagnetic Compatibility. Dec2014, Vol. 56 Issue 6, p1480-1487. 8p.

مصطلحات موضوعية: ELECTROMAGNETIC wave propagation, ELECTRONIC equipment, ELECTROMAGNETIC fields, TRANSMISSION line matrix methods, PROBABILITY density function, CAVITY resonators

مستخلص: The effectiveness of the random coupling model (RCM) in predicting electromagnetic wave coupling to targeted electronic components within a complex enclosure is examined. In the short-wavelength limit with respect to the characteristic length of the enclosure, electromagnetic wave propagation within a large enclosure is sensitive to small changes to the interior, or to the boundaries of the enclosure. Such changes can reduce or invalidate the applicability of deterministic predictions of the electromagnetic fields at radiofrequencies (RF) in large enclosures. Under such circumstances, a statistical approach is needed to provide a better understanding of RF coupling to components within large enclosures. In this paper, we experimentally demonstrate the applicability of a statistical technique, the RCM, to estimate the probabilistic magnitudes of RF fields on electrically large components (i.e., long cables, etc.) that are partially shielded within a complex, 3-D enclosure. [ABSTRACT FROM AUTHOR]

: Copyright of IEEE Transactions on Electromagnetic Compatibility is the property of IEEE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Yang, Cheng, Wendt, Torben, De Stefano, Marco, Kopf, Marc, Becker, Christopher, Grivet-Talocia, Stefano, Schuster, Christian

المصدر: IEEE Transactions on Electromagnetic Compatibility; Dec2021, Vol. 63 Issue 6, p1884-1895, 12p

مصطلحات موضوعية: DIODES, NONLINEAR analysis, ELECTROMAGNETIC wave propagation, HYBRID computer simulation, ELECTROMAGNETIC compatibility

مستخلص: Lumped-element grids provide an attractive option for wave propagation control in electromagnetic compatibility (EMC) engineering. This article investigates the peak shielding effectiveness (SE) of a diode grid used for protection of enclosures with apertures against high-intensity radiation fields (HIRFs). The nonlinearly loaded aperture is investigated with an efficient hybrid field-circuit simulation approach. Numerical experiments show that design aspects, e.g., aperture and enclosure size, grid density, impedance characteristic of lumped loads, play an important role in the field transmission through a diode grid which is nonlinear and time-variant. With a physics-based analysis of the interaction between the grid and the enclosure-backed aperture, nonlinear shielding techniques are identified that allow a control of the peak SE between 0 and 26 dB in novel ways. For the first time, the peak SE curve of a diode grid is demonstrated with four different field intensity dependencies, i.e., intensity low-pass, intensity high-pass, intensity bandpass, and intensity band-stop selectivities from tens V/m to hundreds of V/m. By considering design aspects into a two-step optimization procedure, practical guidelines are provided for the nonlinear shielding implementation. [ABSTRACT FROM AUTHOR]

: Copyright of IEEE Transactions on Electromagnetic Compatibility is the property of IEEE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Hurst, Kathy Wei¹, Ellingson, Steven W.² ellingson@vt.ed

المصدر: IEEE Transactions on Electromagnetic Compatibility. Aug2008 Part 1 of 2, Vol. 50 Issue 3, p504-512. 9p. 2 Diagrams, 4 Charts, 1 Graph.

مصطلحات موضوعية: AIRCRAFT antennas, RADIO wave propagation, AIRCRAFT cabins, FUSELAGE (Airplanes), ELECTRONIC equipment

مستخلص: The increasing use of mobile electronic devices by passengers and equipment on large aircraft may increase the likelihood of interference with the aircraft's electronic systems. Thus, the "interference path loss" from a transmitting device inside the cabin of such aircraft to the antenna terminals of a victim system of the aircraft is of interest. Full-wave modeling and other deterministic techniques are impractical or undesirable for this purpose due to the potentially large electrical dimensions of the aircraft, as well as the variability of the cabin configuration. An alternative hybrid analysis technique applicable to frequencies above very high frequency is proposed in which one first estimates the power that escapes the cabin using a simple method based on microwave cavity theory. Next, the radiating windows are modeled as magnetic cur- rents on a cylinder modeling the fuselage, and the resulting electric field at the location of the victim antenna is determined using the uniform geometrical theory of diffraction. Finally, the power delivered to the victim antenna is estimated as the coherent sum of fields incident from the windows. This technique yields results consistent with measured results and yields additional physical insight that would be difficult to obtain through measurements or full-wave methods. [ABSTRACT FROM AUTHOR]

: Copyright of IEEE Transactions on Electromagnetic Compatibility is the property of IEEE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Tarng, J.H., Ju, K.M.

المصدر: IEEE Transactions on Electromagnetic Compatibility. May99, Vol. 41 Issue 2, p100. 7p. 4 Black and White Photographs, 1 Diagram, 5 Graphs, 3 Maps.

مصطلحات موضوعية: *CELL phones, RADIO wave propagation, SCATTERING (Physics)

مستخلص: Presents a novel three-dimensional scattering model to determine the path loss of a microcellular radio channel in an urban environment. Propagation environment and measurement procedure; Patched-wall model features.

المؤلفون: Taylor, Clayborne D., Gutierrez, Samuel J.

المصدر: IEEE Transactions on Electromagnetic Compatibility. Feb99, Vol. 41 Issue 1, p46. 4p. 2 Diagrams, 1 Chart, 4 Graphs.

مصطلحات موضوعية: RADIO wave propagation, CINDER blocks, CONCRETE walls

مستخلص: Examines the radio frequency propagation into a building constructed of cinder block. Occurrence of the penetration into the building interior as a result of propagation through walls; Attenuation of the internal magnetic field of the building; Production of maxima and minima in the attenuation data.

المؤلفون: Hou, Wenhao, Azadifar, Mohammad, Rubinstein, Marcos, Rachidi, Farhad, Zhang, Qilin

المصدر: IEEE Transactions on Electromagnetic Compatibility; Oct2020, Vol. 62 Issue 5, p2137-2147, 11p

مصطلحات موضوعية: ELECTROMAGNETIC fields, FINITE difference time domain method, MOUNTAIN wave, ELECTROMAGNETIC wave propagation, MOUNTAINS, ELECTROMAGNETIC waves, MOUNTAIN soils

مستخلص: In this article, the effect of a mountain located on the propagation path of lightning-radiated electromagnetic fields was systematically studied by using the two-dimensional finite-difference time-domain method (2-D FDTD), considering the influence of the return stroke (RS) type, the ground conductivity, the mountain height and the width at the base, its position, and the observation distance. The field peak reduction and the wave arrival time delay, compared with those for the perfectly conducting flat ground, are analyzed in detail. The results show that, with an increase in the mountain height, the field peak reduces and the wave arrival time delay increases. The wave arrival time is insensitive to the change of mountain widths. The terrain envelope method can be used to estimate the additional time delay introduced by the mountain. For a mountain lower than 1 km or so, the additional attenuation effect of the mountain on the field peak can be ignored for most practical purposes. Furthermore, the propagation process of the lightning-radiated electromagnetic wave over the mountain was studied by analyzing the spatiotemporal evolution characteristics of the field. The analysis shows that the electromagnetic wave propagates to the back of the mountain through the diffraction process at the mountaintop. [ABSTRACT FROM AUTHOR]

: Copyright of IEEE Transactions on Electromagnetic Compatibility is the property of IEEE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Pawlik, Brent, Woodhouse, Darren J., Summers, Terrence J.

المصدر: IEEE Transactions on Electromagnetic Compatibility; Oct2020, Vol. 62 Issue 5, p2065-2075, 11p

مصطلحات موضوعية: RAYLEIGH waves, MAGNETIC permeability, ELECTROMAGNETIC wave propagation, WAVE equation, ELECTROMAGNETIC waves, ELECTRICAL conductors

مستخلص: This article extends the solution to an electromagnetic wave propagating along a thin wire parallel to the interface between two homogeneous half-spaces to wires coated with insulation. The solution presented in this article includes half-spaces with different magnetic permeability and wires with finite conductance. The solution agrees with earlier works after appropriate restrictions are applied. The effects of varying the parameters representing the half-spaces and conductor insulation on the system attenuation constant are investigated. Equivalent line parameters for the propagation are extracted from the full wave modal equation and analytical approximations of these parameters are provided for conductors located above or below the interface assuming the half-spaces are formed by the earth and air. The limitations of the approximations are investigated and compared with previous approximations that have been identified as used outside the range of their applicability. As well as reviewing some of the more fundamental works on the subject, this article contributes to understanding the limitations of existing theory and establishes an alternate process for further extensions in the field. [ABSTRACT FROM AUTHOR]

: Copyright of IEEE Transactions on Electromagnetic Compatibility is the property of IEEE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Rizk, Mohammad E. M., Lehtonen, Matti, Baba, Yoshihiro, Ghanem, Abdelhady

المصدر: IEEE Transactions on Electromagnetic Compatibility; Aug2020, Vol. 62 Issue 4, p1209-1218, 10p

مصطلحات موضوعية: FLASHOVER, FINITE difference time domain method, LIGHTNING protection, ELECTROMAGNETIC interference, NEWTON-Raphson method, ELECTRIC potential, ELECTROMAGNETIC waves, ELECTROMAGNETIC wave propagation

مستخلص: Induced voltages on overhead distribution lines owing to lightning return strokes cause insulators flashovers and consequently, line outages. Basically, shield wires and surge arresters form the lightning protection system for overhead lines to improve the performance of distribution systems against return strokes. The effectiveness of the lightning protection system depends essentially on the grounding system on which shield wire and surge arrester are installed. This article presents a numerical approach to consider the transient models at the points of discontinuity where the lightning protection system exists on multiconductor overhead line. The finite-difference time-domain method is applied to Agrawal coupling model to solve numerically the electromagnetic wave propagation along the line, whereas the Newton–Raphson method is exclusively used for the points of discontinuity. The results obtained considering the transient model as well as a dc model are compared to clarify the influence of the line discontinuity model on the propagating electromagnetic waves. The computational stability of the proposed method is confirmed for different cases of lightning waveforms, distances between points of discontinuity, and stroke locations with line discontinuities. [ABSTRACT FROM AUTHOR]

: Copyright of IEEE Transactions on Electromagnetic Compatibility is the property of IEEE and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)