[PDF] Investigation Of Electromagnetic Interference Through Slots In Shielding Enclosures eBook

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Page : 804 pages
File Size : 50,36 MB
Release : 1994
Category : Aeronautics
ISBN :

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

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Publisher :
Page : 162 pages
File Size : 14,13 MB
Release : 1988
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ISBN :

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General expressions for the electric and magnetic fields at any point inside slotted and continuous, rectangular enclosures exposed to arbitrary external, time harmonic source fields are obtained under the assumption that the enclosures are constructed from good conductors and the slot is small compared to the wavelength of the source field. These expressions consist of infinite series summed over the TE waveguide modes where each term is the product of one or more mode functions and a Fourier coefficient that depends on the spatial variation of the source magnetic field. The Fourier coefficients were evaluated in closed form for two cases: the outside surface of the slot exposed to a spatially uniform magnetic field and the outside surface of one wall of the continuous enclosure exposed to a spatially uniform magnetic field. Frequency domain calculations based on these expressions showed that for frequencies below the enclosure cutoff frequency, the magnetic field at all locations inside a typical slotted enclosure is independent of frequency. For the same range of frequencies the field inside a continuous enclosure is a monotonically decreasing function of frequency. At frequencies above cutoff, the fields in both slotted and continuous enclosures show very complex behavior associated with cavity resonances.

Author : William R. Free
Publisher :
Page : 78 pages
File Size : 11,66 MB
Release : 1967
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ISBN :

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During the period covered by this report, investigations of techniques and procedures for making radiation measurements in shielded enclosures which can be correlated with open-field measurements have continued. The primary objective of this program is to develop a capability for determining the case radiation and susceptibility characteristics of U.S. Army communication equipments in the controlled environments of shielded enclosures. A microwave hooded antenna capable of making the desired measurements in a shielded enclosure over the frequency range from 1 to 12 GHz has been developed and evaluated. Techniques for calibrating this probe antenna have been investigated during this period and are described in detail. A UHF hooded antenna, for use over the frequency range from 200 to 1500 MHz, has also been developed. The evaluation of this probe antenna has continued during this period and the results obtained to date are presented. Theoretical and experimental investigations of the field distribution within a shielded enclosure at low frequencies are discussed. (Author).

Author : Salvatore Celozzi
Publisher : John Wiley & Sons
Page : 385 pages
File Size : 41,31 MB
Release : 2008-05-16
Category : Technology & Engineering
ISBN : 0470268476

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The definitive reference on electromagnetic shielding materials, configurations, approaches, and analyses This reference provides a comprehensive survey of options for the reduction of the electromagnetic field levels in prescribed areas. After an introduction and an overview of available materials, it discusses figures of merit for shielding configurations, the shielding effectiveness of stratified media, numerical methods for shielding analyses, apertures in planar metal screens, enclosures, and cable shielding. Up to date and comprehensive, Electromagnetic Shielding: Explores new and innovative techniques in electromagnetic shielding Presents a critical approach to electromagnetic shielding that highlights the limits of formulations based on plane-wave sources Analyzes aspects not normally considered in electromagnetic shielding, such as the effects of the content of the shielding enclosures Includes references at the end of each chapter to facilitate further study The last three chapters discuss frequency-selective shielding, shielding design procedures, and uncommon ways of shielding—areas ripe for further research. This is an authoritative, hands-on resource for practicing telecommunications and electrical engineers, as well as researchers in industry and academia who are involved in the design and analysis of electromagnetic shielding structures.

Author : Xingcun Colin Tong
Publisher : CRC Press
Page : 342 pages
File Size : 31,2 MB
Release : 2016-04-19
Category : Technology & Engineering
ISBN : 1420073591

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With electromagnetic compliance (EMC) now a major factor in the design of all electronic products, it is crucial to understand how electromagnetic interference (EMI) shielding products are used in various industries. Focusing on the practicalities of this area, Advanced Materials and Design for Electromagnetic Interference Shielding comprehensively

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Publisher : ScholarlyEditions
Page : 550 pages
File Size : 36,8 MB
Release : 2013-06-21
Category : Science
ISBN : 1481696815

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Alkadienes—Advances in Research and Application: 2013 Edition is a ScholarlyBrief™ that delivers timely, authoritative, comprehensive, and specialized information about ZZZAdditional Research in a concise format. The editors have built Alkadienes—Advances in Research and Application: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about ZZZAdditional Research in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Alkadienes—Advances in Research and Application: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Author : Anatoly Tsaliovich
Publisher : Springer Science & Business Media
Page : 481 pages
File Size : 25,2 MB
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 146156591X

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The mathematical theory of wave propagation along a conductor with an external coaxial return is very old, going back to the work of Rayleigh, Heaviside, and J. J. Thomson. These words were written by S. A. Schelkunoff back in 1934. Indeed, those early works dealt with signal propagation along the line as well as electromagnetic shielding of the environment inside and/or outside the metallic enclosures. Max well himself developed pioneering studies of single-layer shielding shells, while a paper with such a "modern" title as "On the Magnetic Shielding of Concentric Spherical Shells" was presented by A. W Rucker as early as 1893! * Such "state of the art" shielding theory created in the last century is even more amazing if you think that at almost the same time (namely, in 1860s), a manuscript of Jules Verne's book, Paris in the. xx Century, was rejected by a publisher because it pre dicted such "outrageously incredible" electrotechnology as, for example, FAX service by wires and the electrocutioner's chair. (With regard to the last invention, I suspect many readers would rather Jules Verne has been wrong. ) However, although the beginning of electromagnetic shielding theory and its implementation to electronic cables date back more than a century, this dynamic field keeps constantly growing, driven by practical applications.