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Electromagnetic Compatibility, 1988. Symposium Record., IEEE 1988 International Symposium on

Date 2-4 Aug. 1988

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Displaying Results 1 - 25 of 92
  • IEEE 1988 International Symposium on Electromagnetic Compatibility. Symposium Record (Cat. No.88CH2623-7)

    Publication Year: 1988
    Request permission for commercial reuse | PDF file iconPDF (9 KB)
    Freely Available from IEEE
  • Power reflection techniques in susceptibility tests of electronic devices

    Publication Year: 1988, Page(s):1 - 5
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB)

    A setup for statistical tests of electronic devices with fast transients is described. It contains a transient generator, the test box for the device-under-test (DUT), and a delay line along with a digitizing oscilloscope and personal computer. The purpose is to find a relationship between the damage threshold and time-dependent functions of the voltage, current, and power and the total energy abs... View full abstract»

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  • Analysis of electromagnetic fields in loaded TEM cells by finite element method

    Publication Year: 1988, Page(s):6 - 8
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (151 KB)

    The distribution of the electromagnetic field in a transverse-electromagnetic-field (TEM) cell, loaded with various equipment-under-test (EUT), is calculated using the finite-element method (FEM). The calculations are performed for a two-dimensional (2-D) configuration for inhomogeneous dielectric-conductor EUTs of various cross-sectional dimensions. The set of curves obtained provides a means of ... View full abstract»

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  • Diagnosis and reduction of conducted noise emissions

    Publication Year: 1988, Page(s):19 - 23
    Cited by:  Papers (27)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (355 KB)

    A systematic method for the diagnosis and reduction of conducted noise emissions is described. A device for determining whether the differential- or the common-mode component of conducted noise is dominant is described. This information is used to determine which element of the filter should be changed to effect a reduction in the total emission. The use of the method to modify a power-supply filt... View full abstract»

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  • EMI response of cable systems to transients considering complex transfer impedance

    Publication Year: 1988, Page(s):24 - 29
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    An improved theoretical approach for calculating the voltage response excited at the terminations of a shielded cable system by an ambient signal is presented. No restrictions are placed on either the current distribution or the local transfer impedance (Z/sub T/). The method is applicable to arbitrarily oriented cable-system structures. Experimental results show good agreement with theoretical pr... View full abstract»

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  • Mode-stirred chamber for measuring shielding effectiveness of cables and connectors: an assessment of MIL-STD-1344A method 3008

    Publication Year: 1988, Page(s):30 - 36
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (585 KB)

    The mode-stirred method for measuring the shielding effectiveness (SE) of cables and connectors as specified in MIL-STD-1344A method 3008 is examined. Problems encountered in applying the method are identified, and recommendations to obtain improved results are provided. These include chamber design, type and placement of transmitting and reference-receiving antenna, determination and correction o... View full abstract»

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  • EMP coupling to coaxial shielded cables

    Publication Year: 1988, Page(s):37 - 44
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB)

    A method for determining the effects induced within shielded cables by a high-altitude nuclear electromagnetic pulse (EMP), represented as a plane wave, is presented. The cable is regarded as a multiconductor line in which the EMP sources are impressed on the shield. An efficient matrix procedure permits simultaneous calculation of transient voltages and currents at any point on each conductor. Th... View full abstract»

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  • SHF/EHF field-to-wire coupling model

    Publication Year: 1988, Page(s):50 - 54
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (371 KB)

    Method-of-moments calculations have provided a database for deriving an empirical algorithm to characterize SHF/EHF coupling. The data show that the maximum field-to-wire current coupled into a port saturates as a function of height above the ground plane and that the saturation level can be simply characterized. The most important parameter in determining the saturation current is the near-port t... View full abstract»

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  • The evolution of MININEC (method of moments computer program for antenna analysis)

    Publication Year: 1988, Page(s):66 - 68
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (215 KB)

    The Mini Electromagnetics Code, or MININEC, is a method-of-moments computer program for the analysis of thin-wire antennas. A Galerkin procedure is applied to an electric-field integral equation to solve for the wire currents. This formulation results in an unusually short computer program suitable for implementation on a microcomputer. Hence, MININEC is written in BASIC, which is compatible with ... View full abstract»

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  • Finite element method applied to shielding performance of enclosures

    Publication Year: 1988, Page(s):69 - 72
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    The shielding effectiveness of enclosures is predicted by means of a computer simulation based on the finite-element technique. To characterize shielding performance, possible sources of electromagnetic interference (EMI), such as radiated EMI, conducted EMI, grounding, electrostatic discharge and environmental effects, along with their corresponding distances (near- or far-field) to the equipment... View full abstract»

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  • Design of broadband antenna matching networks

    Publication Year: 1988, Page(s):78 - 81
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB)

    The theoretical limitations of the design of antenna-matching networks that provide a constant voltage standing-wave ratio (VSWR) are discussed. The development of a numerical method to design these networks as well as its implementation in a very user-friendly computer program is described. Several examples of the computer program use are presented, and the application to broadband EMC measuremen... View full abstract»

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  • Improvement in antenna factor measurements using time-domain gating

    Publication Year: 1988, Page(s):82 - 86
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A method for improving site attenuation and antenna-factor measurements using time-domain gating is presented. Results of measurements for biconical antennas in the 20-200 MHz range for both polarizations, using various time gates are presented. It is shown that a judicious choice of time gates results in a tremendous improvement in the accuracy of site attenuation and antenna-factor measurements ... View full abstract»

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  • Structure of EM field at an open field site

    Publication Year: 1988, Page(s):94 - 98
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (357 KB)

    Detailed field plots showing the structure of the measured electromagnetic (EM) field in a three-dimensional volume of an open-field site, due to a variety of source antennas, are presented. Measured antennas include broadband antennas, such as the biconical and log-periodic antennas, as well as dipole antennas in the 50-MHz to 1-GHz frequency range. The results are in the form of contour maps of ... View full abstract»

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  • An investigation into the scattering and radiation characteristic of RF-absorbers

    Publication Year: 1988, Page(s):99 - 105
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (318 KB)

    The attenuation and radiation characteristics of a pyramidal absorber are studied, both analytically and experimentally, including bulk-parameter data for commercially available, measured samples. Absorber attenuation is modeled as a plane wave incident on a layered medium with a varying complex permittivity. Attenuation experiments performed in a TEM cell confirm the validity of this approach. Th... View full abstract»

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  • Numerical investigations on pulse coupling to single and multiple conductor systems

    Publication Year: 1988, Page(s):112 - 117
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB)

    Pulse coupling to single- and multiple-conductor systems is investigated by means of numerical field calculations for excitation by a plane electromagnetic pulse field. The effects on a single wire are calculated first, and the difference between a short-circuit and open-circuit line is illustrated. For two systems of parallel lines of different lengths, some typical coupling effects are shown and... View full abstract»

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  • Multiconductor cable response dependency on propagation modes

    Publication Year: 1988, Page(s):118 - 123
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (470 KB)

    A theoretical and experimental study of the response of shielded multiconductor cables to external transient fields is presented. A relationship between propagation modes and peak voltage response of the conductors is established. Experimental observation of the propagation modes on a multiconductor cable proved difficult with traditional transform techniques. Therefore, a maximum entropy spectral... View full abstract»

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  • Radiation from a transmission line carrying current of an arbitrary waveform

    Publication Year: 1988, Page(s):124 - 129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (321 KB)

    The radiation from a finite-length transmission line in which a current of arbitrary waveform is flowing is examined. This phenomenon can be considered to be the opposite of the coupling of a wave of an arbitrary waveform to the line. By representing both phenomena in the form of a three-pair-terminal network, the radiation problem can be examined using the circuit concept. An expression for the r... View full abstract»

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  • Susceptibility of cables in shielded environment to external excitations

    Publication Year: 1988, Page(s):130 - 133
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB)

    An approach to the analysis of cables in a shielded environment is presented. Electromagnetic sources exterior to this environment excite at least one of the cables. The formulation of this problem uses Fourier series to approximate the waveform of the unknown currents excited on each cable. The Fourier coefficients are determined by enforcing an appropriate boundary condition. The coupling among ... View full abstract»

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  • A new approach to electromagnetic coupling

    Publication Year: 1988, Page(s):140 - 144
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (330 KB)

    A method used to calculate the spatial distribution of currents within conducting structures of complicated shapes, as well as the near and far electric and magnetic fields around them, is presented. The structure is divided into segments that are modeled as prolate spheroids. A solution that is analytical and has a predictable behavior, yet can be easily implemented in computer code, is found for... View full abstract»

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  • Frequency assignment for land mobiles in large urban areas

    Publication Year: 1988, Page(s):145 - 150
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (533 KB)

    Using the frequency assignment model of M.C. Delfour and G.A. DeCouvreur (see IEEE Trans. on Electromagn. Compatibility 1987), recent developments which further increases the capacity of the underlying assignment grid, incorporate a predetermined distribution of single-user and multiuser frequencies, and handle gaps in the band are presented. The method is applied to the present user distribution ... View full abstract»

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  • Decongesting Navy non-tactical VHF band usage

    Publication Year: 1988, Page(s):151 - 157
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB)

    To alleviate worsening electromagnetic interference (EMI) due to congestion in the 138-150.8 MHz band, in 1982 the US Navy launched an engineering effort to realign systematically its Navy and USMC users in major geographic areas where it operates. The band is allocated to fixed, mobile, and radio navigation satellite services, but the military services use the band primarily for nontactical mobil... View full abstract»

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  • An effective frequency assignment technique for solving problems subject to multiple constraints

    Publication Year: 1988, Page(s):158 - 163
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A technique that has been used for solving large-scale frequency assignment problems involving multiple constraints is described. The model has a modular construction that enables it to be adapted to a variety of assignment problems. The major contribution is an effective procedure for exploiting all of the assignment constraints to define a sequence in which the assignment requests should be proc... View full abstract»

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  • Fields radiated by electrostatic discharges

    Publication Year: 1988, Page(s):179 - 183
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (235 KB)

    The problem of electrostatic discharge (ESD) radiated fields problem is examined, both theoretically and experimentally. Measurements indicate that the electric fields can be quite significant (>150 V/m at a distance of 1.5 m), particularly for relatively low-voltage sparks (<6 kV). A theoretical dipole model for the ESD spark is developed to compute the radiated fields. The agreement between theo... View full abstract»

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  • Test procedure and specifications for component susceptibility to electrostatic discharges

    Publication Year: 1988, Page(s):190 - 195
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A component-level electrostatic discharge (ESD) test procedure and specifications, developed to provide a means for early evaluation of ESD compatibility of electronic systems, is presented. The steps taken in the development of the ESD component procedure and specifications are reviewed. Three discharge methods and the variables associated with them are discussed. Conclusions are presented based ... View full abstract»

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  • Standardization of electrostatic discharge testing

    Publication Year: 1988, Page(s):196 - 199
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (246 KB)

    An overview is given of the activities and directions of the various worldwide committees working on the electrostatic discharge (ESD) phenomena. The current technical issues, position, and documentation status are discussed for each committee. The technical aspects of the work done to date, as well as its resolution or discrepancies, are presented.<> View full abstract»

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