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Electromagnetic Compatibility, 1991. Symposium Record., IEEE 1991 International Symposium on

Date July 12 1991-Aug. 16 1991

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Displaying Results 1 - 25 of 116
  • IEEE 1991 International Symposium on Electromagnetic Compatibility. EMC Society. Radiating Compatibility from New Jersey (Cat. No.91CH3044-5)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (455 KB)
    Freely Available from IEEE
  • Radiated emissions test performance of the GHz TEM cell

    Publication Year: 1991, Page(s):1 - 7
    Cited by:  Papers (15)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (650 KB)

    The gigahertz transverse electromagnetic (GTEM) cell has recently been recognized as a competing technology for the accomplishment of electromagnetic compatibility (EMC) radiated emissions testing for the demonstration of compliance with commercial specifications. As a competing technology, the direct comparison of the performance of a GTEM, for such compliance measurements, to the results obtaine... View full abstract»

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  • Theoretical and experimental analysis of a multi-wire rectangularly shielded transmission line for EMC measurements

    Publication Year: 1991, Page(s):8 - 13
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    The theoretical and experimental analysis of a device for electromagnetic compatibility (EMC) measurements is detailed. The structure is similar to a transverse electromagnetic (TEM) cell, with an inner wire array rather than a metallic septum. The device is referred to as a WireTEM (WTEM) cell. Its performance as a standard electromagnetic (EM) fields generator has been estimated by a theoretical... View full abstract»

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  • Theoretical and experimental modeling of longitudinal characteristics of TEM cells

    Publication Year: 1991, Page(s):14 - 16
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (226 KB)

    Longitudinal characteristics of transverse electromagnetic (TEM) cells include longitudinal variations of electric field and impedance. These characteristics have only been observed in an in-depth experimental investigation reported by Crawford et al. (1974,1977). A theoretical approach to model these characteristics is presented. Their relations with voltage standing wave ratio (VSWR), loss, term... View full abstract»

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  • A radar-to-radar interference prediction model

    Publication Year: 1991, Page(s):200 - 205
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The radar interference prediction program (RIPP) is described. RIPP is a computer model that predicts interference between radars assuming antenna-to-antenna coupling. The measure of effect that RIPP calculates is the probability of interference (Pi). Pi is defined as the probability that the interference-to-noise ratio (INR) exceeds the 50% probability of d... View full abstract»

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  • Software as a tool for controlling EMI/EMC

    Publication Year: 1991, Page(s):198 - 199
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    Traditional methods of controlling electromagnetic interference (EMI) typically deal with hardware-based solutions such as grounding, bonding, shielding, filtering, and equipment placement. With the evolution of microprocessor- and computer-controlled systems, system flexibility and effectiveness increase up to a point where ambiguities reduce effectiveness and introduce the potential for a new fo... View full abstract»

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  • Methodology and decision making during high confidence system level EMC analysis

    Publication Year: 1991, Page(s):193 - 197
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The management and technical issues encountered in producing a high confidence electromagnetic compatibility (EMC) analysis for a complex system when MIL-E-6051 safety margins are demonstrated without the benefit of a system level EMC test are discussed. The successful approach (involving application of validated, system level EMC analysis codes) provided acceptable, high confidence predictions of... View full abstract»

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  • The role of systems EMC analysis in large system EMC management by equipment EMC assurance

    Publication Year: 1991, Page(s):189 - 192
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Electromagnetic compatibility (EMC) at the system level is often ignored, to the detriment of total system performance. Complete systems EMC is often a difficult and elusive goal, since systems are often too large to adequately or efficiently test, or complete systems are not available for test until initial customer installation, where testing could be impractical. Following a review of definitio... View full abstract»

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  • A new measurement technique for the control of the integrity of shielded rooms

    Publication Year: 1991, Page(s):106 - 108
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    An innovative electronic system for measuring and controlling the shielding effectiveness of a screened room is presented. It has the advantage of making continuous measurements possible. The basic property of the system described is that it allows the use of very narrow receiver bandwidth without major cost increase. The two most obvious uses of this narrow bandwidth are an increased sensitivity ... View full abstract»

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  • Reciprocity in EMI-EMC

    Publication Year: 1991, Page(s):184 - 188
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The basis of and errors in interpreting the law of reciprocity are reviewed and applied to conducted and radiated electromagnetic interference-electromagnetic compatibility (EMI-EMC). Conditions for reciprocity include reversibility and passivity of elements in the reciprocal system. The law is expressed in circuit form and the reciprocal signals are clearly distinguished. Symmetric and asymmetric... View full abstract»

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  • Surge current distribution in building during a direct lightning stroke

    Publication Year: 1991, Page(s):103 - 105
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A direct lightning strike to a building may cause damage or interference in the operation of electronic equipment inside the structure and may even be dangerous to the people in the more critical case. In order to decide on an efficient lightning protection system, it is important to determine the lightning current distribution in the building. Knowledge of the current distribution is obtained fro... View full abstract»

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  • Electromagnetic wave scattering by buildings and objects in radio and mobile communication

    Publication Year: 1991, Page(s):226 - 227
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    The scattering and diffraction characteristics of several basic objects with respect to electromagnetic (EM)-wave propagation in radio communication are shown using the finite element method (FEM) and the boundary element method (BEM). These basic problems are needed to evaluate scattering and diffraction by complex-shaped objects. The properties related to near fields and induced currents are cla... View full abstract»

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  • Radio frequency attenuation of saline solutions

    Publication Year: 1991, Page(s):182 - 183
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Radio frequency (RF) susceptibility tests on pacemakers are frequently performed with the pacemakers in a saline solution. The attenuation provided by three different saline concentrations over the frequency range of 30-800 MHz is investigated. During these investigations it was found that 10 cm of saline provides anywhere from 0 to 19 dB of attenuation depending on the frequency and saline concen... View full abstract»

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  • Lightning overvoltages in wires within the buildings

    Publication Year: 1991, Page(s):99 - 102
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Electromagnetic fields generated by lightning currents may cause damage or interference in the operation of electronic and electric systems. Particularly hazardous to equipment operating within a building is a direct lightning strike to the building or its vicinity. For this reason, a theoretical determination of currents and voltages induced by lightning electromagnetic pulses in simple arrangeme... View full abstract»

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  • Scattering of an obliquely incident plane wave by conducting prolate spheroids

    Publication Year: 1991, Page(s):224 - 225
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    The computation of the complex eigenfrequencies of prolate spheroids with an obliquely incident plane wave is discussed. The approach applied for these solutions is the geometrical theory of diffraction (GTD). It derives the closure conditions for a creeping wave traveling along the quasi-helix and the second phase matching condition with an azimuthal round of a prolate spheroid. The resulting com... View full abstract»

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  • A fully automatic, accurate method for the performance evaluation and calibration of absorber-lined chambers for radiated-emission tests

    Publication Year: 1991, Page(s):19 - 24
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Absorber-lined chambers which do not meet the ±4 dB site acceptability criterion based on normalized site attenuation (NSA) measurements require correction factors for radiated-emission tests. Such correction factors cannot be derived from deviations between measured NSA and standard reference data because the radiation characteristics of actual equipment under test have to be taken into ac... View full abstract»

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  • Receiver conducted susceptibility testing of spread 2 spectrum systems

    Publication Year: 1991, Page(s):176 - 181
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Modern communication and navigation devices utilize spread spectrum technology to provide optimal use of the allocated RF spectrum and to minimize the effects of intentional interference and unintentional RF noise. The four most common spread spectrum techniques are briefly reviewed. Modern military communications equipment utilizes one or more of these techniques for signal transmission, while co... View full abstract»

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  • Calculation of the lightning induced voltage on overhead transmission line

    Publication Year: 1991, Page(s):96 - 98
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    A numerical simulator capable of predicting induced voltages of overhead wires is developed. This simulator is divided into three parts. The first calculates the lightning return stroke between cloud and ground, the second obtains the electromagnetic fields generated, and the last simulates a transmission line. A model of the whole system is presented: the source, the propagation, and the victim o... View full abstract»

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  • Electromagnetic field penetration into a dielectric-filled cylindrical cavity of arbitrary cross section: TE case

    Publication Year: 1991, Page(s):222 - 223
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (48 KB)

    Summary form only given. The system is excited by a plane wave whose magnetic vector is parallel to the axis of the cylinder (TE). The problem is solved numerically by applying the method of moments to the electric field integral equation. Pulses are used as both testing and expansion functions View full abstract»

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  • A strip-line TEM cell for measuring electromagnetic emissions

    Publication Year: 1991, Page(s):17 - 18
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The results of preliminary measurements of the properties of two stripline transverse electromagnetic (TEM) cells are presented. The construction of the field cell is illustrated schematically. Measurements of emissions from a standard source made in a stripline TEM cell show good correlation with measurements of the same source made in a semi-anechoic chamber. The stripline TEM cell has several p... View full abstract»

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  • A method of generating 200-990 MHz electric fields for electromagnetic susceptibility testing

    Publication Year: 1991, Page(s):173 - 175
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A method for generating constant-amplitude electric fields used for swept-frequency electromagnetic susceptibility (EMS) testing in the frequency range 200-990 MHz is developed. The test equipment used to generate the fields has parameters which vary as a function of frequency, such as antenna factors, cable loss, reflection coefficient of the measurement site, amplifier gain, etc. The output volt... View full abstract»

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  • A complete lightning protection system simulation in the EMI analysis

    Publication Year: 1991, Page(s):90 - 95
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    During the draining to earth of a lightning current, the protection system generates an electromagnetic disturbance in the protected volume. The calculation code realized by the authors is able to evaluate the transient electromagnetic behavior of a complete lightning protection system regardless of the structure complexity and the location conditions. The model accounts for possible nonlinear phe... View full abstract»

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  • Absorption losses in seawater for a rectangular electromagnetic pulse

    Publication Year: 1991, Page(s):220 - 221
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    Transient solutions for a class of waveforms in a general lossy medium have been published recently (H.F. Harmuth, 1986). These solutions are expressed in terms of improper integrals and are functions of the conductivity of the medium. Numerical evaluation of these integrals for the case of seawater results in ill-conditioned problems giving rise to computational overflows. An approximate closed-f... View full abstract»

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  • Transient analysis for electromagnetic exciting to a wire through a slot in a conducting screen

    Publication Year: 1991, Page(s):44 - 45
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    A method of solution and some results for the electromagnetic transient current response of a finite-length wire due to a transient planar wave excitation through a slot aperture are obtained using the singularity expansion method (SEM). The pertinent SEM parameters are calculated. The equivalent transient magnetic currents in the slot region and the transient electric currents on the wire are fou... View full abstract»

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  • Parasitic capacitances can cause demodulation RFI to differ in inverting and noninverting operational amplifier circuits

    Publication Year: 1991, Page(s):151 - 156
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The demodulation RFI responses of an inverting operational amplifier (op amp) circuit and a noninverting op amp circuit are compared. The intended voltage gain of the inverting op amp circuit is A1=-R2/R1=-10. The intended linear voltage gain of the noninverting op amp circuit is AN1 =(R1+R2)/R1=11. For both circu... View full abstract»

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