IEEE Transactions on Electromagnetic Compatibility

Issue 1 • March 1968

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Displaying Results 1 - 25 of 33
  • Table of contents

    Publication Year: 1968, Page(s): c1
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  • IEEE Electromagnetic Compatibility Group

    Publication Year: 1968, Page(s): c2
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  • Editorial

    Publication Year: 1968, Page(s): 1
    Cited by:  Papers (5)
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  • New Theoretical Expressions for Predicting Shielding Effectiveness for the Plane Shield Case

    Publication Year: 1968, Page(s):2 - 7
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (877 KB)

    The problem of the electromagnetic shielding effectiveness of a thin, plane metal sheet of infinite extent on the electromagnetic field generated by a circular loop field source with uniform current I is solved by application of the quasi-near and near field approximations to the exact integral expressions. The results are shown to be in close agreement with experimental data as well as numerical ... View full abstract»

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  • Low-Frequency Shielding Resonance

    Publication Year: 1968, Page(s):7 - 15
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1104 KB)

    A low-frequency resonance in the 5- to 200-kHz range has been discovered in typical shielding enclosures. It is due to unequal phase shifts in wave transmission to a receiving point via two or more parallel paths: one through the shielding material itself and others through leakage paths such as seams. Theoretical and experimental results are shown to be in close agreement and indicate a new appro... View full abstract»

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  • Shielding Theory of Coaxial Cylindrical Structures

    Publication Year: 1968, Page(s):16 - 28
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3374 KB)

    A theory on the shielding effectiveness of n coaxial metallic tubings which shield a coaxial cable has been developed based on electromagnetic (EM) field theory. The theory holds for all homogeneous, linear, and isotropic shields, magnetic or nonmagnetic, and covers essentially the entire frequency range. When a cable carries an evenly distributed axial current, the dominant mode of propagation is... View full abstract»

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  • Shielding of Cylindrical Tubes

    Publication Year: 1968, Page(s):29 - 34
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (804 KB)

    Shielding attenuation values at low frequencies have been computed for magnetic and nonmagnetic cylindrical tubes based on formulas developed by King.[2] The attenuation in decibels was computed on a digital computer for a range of ratios of wall thickness to depth of penetration from 0.1 to 10 as a function of a nondimensional parameter as used by Kaden.[4] Two graphs are presented that summarize... View full abstract»

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  • Low-Frequency Shielding Effectiveness of Nonuniform Enclosures

    Publication Year: 1968, Page(s):34 - 43
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3139 KB)

    This paper presents a quasi-static approximate solution to the magnetic shielding of several nonuniform enclosures using the integral form of Maxwell's equations and insight gained from other approaches. The solution is called quasi-static as the assumptions made are from physical arguments based on low-frequency cases where the enclosure size is much less than a wavelength. The integral form of M... View full abstract»

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  • Effects of Partial Shields on Transmission Lines at Low Frequencies

    Publication Year: 1968, Page(s):44 - 51
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2228 KB)

    It is often desirable to estimate the degree of shielding achieved between two transmission lines crossing at some specified angle, when one of them is surrounded by a metallic tubing of finite length. A simple analysis that allows a rather accurate estimation of the shielding effectiveness of the tubing at low frequencies where the quasi-static assumption holds is presented. Based upon this quasi... View full abstract»

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  • Review of Circuit Approach to Calculate Shielding Effectiveness

    Publication Year: 1968, Page(s):52 - 62
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1522 KB)

    The shielding effectiveness of an enclosure at low frequencies can be readily computed using a circuit approach. Not only does this technique include the effects of the properties of the shield material, but it also includes the details of the geometry of the enclosure. Furthermore, this approach allows a nonempirical consideration of mesh enclosures and the effects of resistive seams in enclosure... View full abstract»

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  • USAECOM Contributions to Shielding Theory

    Publication Year: 1968, Page(s):63 - 66
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (625 KB)

    To its three shielding study contracts over the past four years, ECOM contributed the analytical advances required to replace concepts found to be unsatisfactory at the start of the studies, yet still prevalent today. The treatment of oblique incidence was contributed by ECOM; the previous restriction to normal incidence is now rejected. The treatment of shields as circuit elements was originated ... View full abstract»

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  • Low-Frequency Electrical Characteristics of RF Shielding Materials

    Publication Year: 1968, Page(s):67 - 72
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3124 KB)

    Values of initial magnetic permeability relative to free space have been obtained by means of novel techniques which permit measurements on material in the form of a flat sheet, a box, or any other configuration containing at least a six-inch square flat surface. As a by-product of the technique, electrical conductivity values may also be obtained. View full abstract»

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  • Survey of Techniques for Measuring RF Shielding Enclosures

    Publication Year: 1968, Page(s):72 - 81
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2396 KB)

    An intensive literature survey has been conducted to review existing techniques for measuring the effectiveness of RF shielding enclosures. Prevalent methods of measuring E- and H-field components and for sensing the total field are discussed and evaluated. The procedures described in the literature are tabulated into groups determined by their similarities in method or theory and are compared by ... View full abstract»

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  • Proposed Recommended Practices for the Measurement of Shielding Effectiveness of High-Performance Shielding Enclosures

    Publication Year: 1968, Page(s):82 - 94
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2208 KB)

    Uniform measurement procedures are proposed for determining the relative effectiveness of room-size high-performance shielding enclosures. Test procedures are designated to measure the effectiveness of a rectangular parallelepiped with edge dimensions ranging from 1.5 to 15 meters. They are formulated to enable use of commercially available equipment for conducting tests under nonideal conditions.... View full abstract»

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  • New Technique for the Determination of the Integrity of Shielded Enclosures by the Measurement of the Perpendicular Magnetic Field

    Publication Year: 1968, Page(s): 94
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (214 KB)

    A solution of electromagnetic field equations with appropriate boundary conditions shows that at the surface of a material with infinite conductivity, no parallel electric field or perpendicular magnetic field exists. As conductivity decreases, there are large relative increases in the parallel electric field and perpendicular magnetic field at the surface. A reduction in permeability lowers the p... View full abstract»

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  • ELF and VLF Shielding Effectiveness of High-Permeability Materials

    Publication Year: 1968, Page(s):95 - 100
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1648 KB)

    Research was conducted to determine the low-frequency shielding effectiveness of magnetic materials. Both analytical and experimental approaches were used. This work is unique in that it provides a technique for experimental separation of the various terms in the shielding expression. Expressions of shielding effectiveness of flat sheets for very low frequencies are derived, and the results of exp... View full abstract»

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  • H-Field Shielding Effectiveness of Flame-Sprayed and Thin Solid Aluminum and Copper Sheets

    Publication Year: 1968, Page(s):101 - 104
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (698 KB)

    Laboratory data are presented for H-field shielding effectiveness of sheets (¿ 20 mil) of aluminum and copper, both in relatively pure form and deposited by flame spraying on insulating material in a normal atmosphere. The measured shielding effectiveness is compared to values calculated on the basis of measured conductivity. The flame-spray conductivity was measured to be much lower than that of... View full abstract»

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  • Thin-Film Shielding for Microcircuit Applications and a Useful Laboratory Tool for Plane-Wave Shielding Evaluations

    Publication Year: 1968, Page(s):105 - 112
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1872 KB)

    The results of plane-wave shielding effectiveness tests on vacuum deposited metallic thin films are discussed. The test data are presented in graphical form for thin films of copper, aluminum, silver, gold, and nickel. Shielding effectiveness as high as 90 dB was obtained. In addition, a novel test instrument and measurement technique were devised for this study. The test procedure is described, d... View full abstract»

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  • An Empirical Study of ELF and VLF Shield Cans

    Publication Year: 1968, Page(s):112 - 125
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3603 KB)

    An empirical ELF and VLF study of 1/16- and 1/32-inch thick shield cans (stainless steel, aluminum, copper, Polyform, annealed Hipernom, and annealed and unannealed coldrolled steel, mumetal, and Co-Netic) was performed to investigate shielding effectiveness versus frequency characteristics with emphasis on the effects of machining (notches, slots, holes, and louvers), dropping, annealing, and wel... View full abstract»

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  • Shielding Density: An Electromagnetic Shielding Design Concept for Weight Sensitive Applications

    Publication Year: 1968, Page(s):126 - 129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (629 KB)

    Laboratory data obtained in a shielding study led to the conclusion that the size or shape of a shielding enclosure does not significantly affect its shielding effectiveness at frequencies below cavity resonance. A figure-of-merit expression for weight-sensitive applications was devised and termed shielding density. It relates shielding effectiveness per unit weight per unit area. This concept is ... View full abstract»

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  • Temperature Stress and Nuclear Radiation Effects on Electromagnetic Shielding

    Publication Year: 1968, Page(s): 129
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (158 KB)

    Military specifications, such as MIL-STD-810 and similar environmental specifications for airborne electronic equipments, delineate the extremes within which such equipment must function properly. Emphasis is usually on physical parameters such as vibration, shock, heat, cold, salt-spray, and corrosive atmospheres. Limits have usually been dictated by practical considerations of terrestrial, opera... View full abstract»

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  • Magnetic Field Pickup by Flexible Braid Coaxial Cables

    Publication Year: 1968, Page(s):130 - 134
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1506 KB)

    Cabling systems have long been known to be a source of unwanted pickup of radio-frequency interference. A typical source of pickup occurs when the outer sheath of a coaxial cable system forms part of a ground return for potentially interfering electromagnetic energy. Another source of penetration arises from a magnetic field which is perpendicular to the axis of the coaxial cable. A previous study... View full abstract»

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  • Resonance Properties of the Shield of a Coaxial Cable over a Ground Plane

    Publication Year: 1968, Page(s): 135
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (197 KB)

    In situations where several high-power transmitters and their antennas are to be used near one another, a certain amount of mutual interference can be expected. An instance of particular interest is that of high-intensity radiation inducing standing waves between the shields of nearby coaxial cables and a metal deck of ground plane. Standing waves induced may cause high potentials and possible bre... View full abstract»

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  • Measurement of RF Leakage in Multipin Electrical Connectors

    Publication Year: 1968, Page(s):135 - 141
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (994 KB)

    In the past measurements of connector RFI leakage have evaluated combinations of the connector and cable so that it has been difficult to separate the effects of the different leakage areas. The methods presented here enable the designer first to evaluate the leakage at the interface coupling with a variety of connector characteristics and then, separately, to obtain the cable RF leakage. Thus the... View full abstract»

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  • Some Electromagnetic Compatibility Grounding and Shielding Considerations in Titanium Aircraft Structures

    Publication Year: 1968, Page(s): 142
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (180 KB)

    High resistivity of titanium alloys (in the vicinity of 200 microohm-cm) requires special consideration of the role of airplane structure as a current return and as an electromagnetic shield. Experimental data and supporting analysis are presented. Voltage drops due to structure currents are larger in titanium than in aluminum airplanes. Return currents in structure are distributed widely instead ... View full abstract»

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Aims & Scope

IEEE Transactions on Electromagnetic Compatibility 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
Prof. Ing. Antonio Orlandi 
University of L'Aquila
Email: antonio.orlandi@univaq.it