National Symposium on Electromagnetic Compatibility

23-25 May 1989

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Displaying Results 1 - 25 of 87
  • IEEE 1989 National Symposium on Electromagnetic Compatability (Cat. No.89CH2736-7)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (191 KB)
    Freely Available from IEEE
  • Effect of flush mounted turntables on site attenuation

    Publication Year: 1989, Page(s):163 - 165
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    When performing various electromagnetic emissions tests, rotation of the equipment under test is often accomplished by the use of turntables. The increasing use of flush mounted metal turntables, instead of above-ground nonmetallic turntables, leads to the problem of how to characterize the interface between the metallic turntable and the ground plane. Several different approaches are used to addr... View full abstract»

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  • An SHF/EHF field-to-wire coupling model enhancement to IEMCAP

    Publication Year: 1989, Page(s):131 - 136
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A description is given of a field-to-wire coupling model enhancement to the Intrasystem Electromagnetic Compatibility Analysis Program (IEMCAP), along with a comparison of the enhanced and previous versions of IEMCAP. The previous model incorporates a bounding algorithm based on transmission line theory. High frequencies or large distances above the ground plane cause the transmission line model t... View full abstract»

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  • Experiences in building an open area test site

    Publication Year: 1989, Page(s):157 - 162
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The author discusses experience gained from the construction of an open-area test site (OATS) in an urban area with high ambient radiofrequency wave levels. It is shown that a high-quality site (as determined by site attenuation measurements) can be achieved by adhering to basic design practices and using conservative design practices when uncertain. The design approach taken to minimize site anom... View full abstract»

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  • A rigorous model to compute the radiation from printed circuit boards

    Publication Year: 1989, Page(s):127 - 130
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A mixed (scalar and vector) potential surface integral equation formulation, originally developed for microstrip antennas by Mosig and Gardiol (1982), is used to compute the radiated emission from printed circuit traces that involve right-angular bends and gap discontinuities. Computed results for a gap-excited trace configuration loaded by a short circuit or an open circuit indicate good agreemen... View full abstract»

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  • Source selection techniques for EMP direct drive simulation

    Publication Year: 1989, Page(s):93 - 96
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Theoretical development of the multiport injection simulation technique proved that simulation would be exact if the proper multisource excitation was applied at the terminals of the cable. Experiments were performed to demonstrate the accuracy of the approximate Thevenin equivalent source injection technique. Judgement of the accuracy of the approximate technique was based on overlays of the inje... View full abstract»

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  • Computation of intermodulation and interference in telecommand due to the ranging signal of the ESA multi purpose tracking system: lack of degradation

    Publication Year: 1989, Page(s):437 - 441
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    The performance of the European Space Agency (ESA) spacecraft telecommand subsystem due to simultaneous ranging is analyzed. The use of the ESA multipurpose tracking system, which represents an improved version of the deep space tracking system, is assumed. Numerical results show that the telecommand bit error rate degradation is negligible and that the frequency optimization proposed by T.M. Nguy... View full abstract»

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  • Radiated emission measurement procedures at an open-area test site

    Publication Year: 1989, Page(s):151 - 156
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Some typical measurement procedures used to perform radiated emission measurements at an open-area test site are discussed. Topics covered include examples of test equipment used, some aspects of emission maximization, equipment under test (EUT) activity during tests, and the minimum set of measurements required to assure compliance. Also discussed are some methods used to distinguish emissions fr... View full abstract»

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  • Test procedure development for automotive conducted susceptibility and conducted emissions

    Publication Year: 1989, Page(s):263 - 270
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Current work on electromagnetic compatibility (EMC) requirements for automotive electronic and electrical components has necessitated the development of certain test procedures and specifications for EMC testing within General Motors. In order to support this effort, a study was performed to characterize the internal electromagnetic environment of the automobile. The authors describe the conducted... View full abstract»

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  • Modelling interference properties of SMPS DC power distribution buses

    Publication Year: 1989, Page(s):119 - 126
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    The potential for a switched-mode power supply (SMPS) DC distribution bus to create electromagnetic interference (EMI) is examined using the SPICE circuit analysis program. Attaching a SMPS to a long length of transmission line essentially places a time changing load across that line. This generates reflections on the line that result in short periods over which the line voltage can change by a si... View full abstract»

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  • Effects of corrosion on the electrical properties of conducted finishes for EMI shielding

    Publication Year: 1989, Page(s):46 - 51
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A variety of combinations of fingerstock materials both before and after exposure to an accelerated atmospheric corrosion environment was tested. The following materials/finishes were tested during this study: 304 stainless steel, passivated, MIL STD QQ-P-35B; 1010 steel, electroplated bright tin, 0.0003 in. nominal coating thickness, ASTM B545; 1010 steel, electroplated nickel 0.0005 in. nominal ... View full abstract»

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  • A method for interlaboratory stripline susceptibility test calibration

    Publication Year: 1989, Page(s):90 - 92
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    A method is presented for correlating susceptibility tests between two different electromagnetic compatibility (EMC) laboratories using stripline antenna test methods by utilizing similar test antennas. A controlled test antenna is used along with swept frequency techniques to gather data rapidly which are then used to correlate results from two or more laboratories or to locate and eliminate the ... View full abstract»

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  • Detuning free-standing towers at MF frequencies

    Publication Year: 1989, Page(s):431 - 436
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Many commercial AM broadcast antennas must maintain a directional pattern to avoid interference with other stations on the same frequency. Scattering of the station's signal can lead to field strengths in excess of those stipulated by the station's licence; free-standing towers scatter the signal effectively if the tower height is comparable to the quarter-wavelength. In the paper, means of suppre... View full abstract»

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  • EMC and the 20-meter band

    Publication Year: 1989, Page(s):248 - 251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Most of the complaints of interference from amateur radio operation in the United States and Canada involve only a few of the many bands authorized to this radio service. The bands most commonly involved are the popular DX bands at wavelengths of 15 and 20 m. The interference from these bands is almost entirely common-mode on the house wiring due to the close correspondence of wiring to resonant l... View full abstract»

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  • Measured effectiveness of a toroid choke in reducing common-mode current

    Publication Year: 1989, Page(s):208 - 210
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    After a brief discussion of the origin of common-mode currents in interconnect cables, the author discusses the theoretical basis for the effectiveness of common-mode chokes for reducing the common-mode current while leaving the desired differential-mode current undiminished. A method for measuring their actual effectiveness is presented along with measured values for a typical commercial unit. Fo... View full abstract»

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  • The graphical attenuation calculation methodology

    Publication Year: 1989, Page(s):299 - 302
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A graphical technique for predicting the attenuation of a filter is described. The method centers around impedance paper and the use of several simple identities and is capable of solving for the attenuation of any multisection filter. The advantage of the method is that it gives the engineer intuitive insight into the operation of the filter, and possibilities for improvement. The weakness of the... View full abstract»

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  • HardSys-applying expert system techniques to electromagnetic hardening

    Publication Year: 1989, Page(s):383 - 385
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The application of expert-system techniques to the electromagnetic hardening domain is briefly described with regard to a prototype named HardSys, written in Prolog and containing a subset of the domain knowledge. In this system the domain knowledge is partitioned into four electromagnetic hardening considerations: the ambient field; the shielding effectiveness; the system susceptibility; and the ... View full abstract»

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  • The feature of harmonic in time domain and the harmonic impedance coefficient ZFn of network

    Publication Year: 1989, Page(s):337 - 342
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    When the harmonic current of nonlinear electric equipment is injected into a network, a disturbance is formed. According to the IEC/TC-77(EMC) and other standards for power systems and plants, the disturbance's degree can be expressed by the network harmonic voltage, resulting from the harmonic current injected into the network from electric equipment. It can also be expressed by Un<... View full abstract»

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  • New circuit modeling of operational amplifiers

    Publication Year: 1989, Page(s):143 - 150
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    A description is given of the design of two macromodels for the 741 operational amplifier to be used for computer code simulation of electromagnetic interference (EMI) effects. These macromodels are designed with the ability to work outside the nominal frequency bandwidth of the real circuit in order to simulate the consequences of small and large amplitude signals representing EMI effects. The de... View full abstract»

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  • Multiconductor cable coupling parameters

    Publication Year: 1989, Page(s):101 - 107
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    Experimental results obtained on a set of simple multiconductor cables with external electromagnetic shields are presented. The purpose of the experiment was to investigate the relationship between the internal cable geometry and the electromagnetic pulse coupling the cables. A set of five cables was selected for this investigation. The cables had an increasing number of internal conductors, from ... View full abstract»

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  • An energy analysis of the EMP damped sinusoid

    Publication Year: 1989, Page(s):54 - 58
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The susceptibility of a circuit to damage from an electromagnetic pulse (EMP) such as lightning or nuclear EMP is often tested by driving the circuit with an exponentially damped sine wave. The energy content of this function is derived in the time and frequency domains for both resistive and resonant loads, leading to a method of specifying the cutoff frequency of lowpass filters so as to limit t... View full abstract»

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  • Modeling of electromechanical and electromagnetic disturbances in DC motors

    Publication Year: 1989, Page(s):258 - 262
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Electromechanical and electromagnetic disturbances produced by DC motors were modeled using a dynamic electrical network representation that includes a representation of the changing circuit configuration due to the commutation. With this technique the instantaneous current and voltage of each of the armature coils of the motor are computed as is the instantaneous electromagnetic torque developed ... View full abstract»

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  • Radiated emission measurements in completely absorber-lined anechoic chambers without groundplanes

    Publication Year: 1989, Page(s):390 - 393
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A technique is presented for radiated-emission tests in completely absorber-lined chambers which are equipped with floor absorbers instead of groundplanes. Data measured in a completely absorber-lined chamber can be converted to open-site equivalents with an accuracy of ±0.5 dB (30-1000 MHz) by applying the conversion factors given. The great advantage of this technique is that tests are pe... View full abstract»

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  • Modeling of electrostatic fields in solid propellants using finite element techniques

    Publication Year: 1989, Page(s):113 - 118
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Features of solid propellants that make them particularly susceptible to electrostatic discharges are described. Since the use of finite-element techniques has proven to be the most satisfactory approach to determining electrostatic fields inside complicated solid propellant geometries, the authors' emphasis is placed on ways to obtain accurate results, on the accuracy of the results using special... View full abstract»

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  • The improvement of the resonance in RFI chamber

    Publication Year: 1989, Page(s):400 - 405
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Reported improvements in resonances observed in a semianechoic radio frequency interference (RFI) measurement chamber are discussed. Due to the chamber's construction details and antenna placement, for 90 MHz measurements one point within the chamber had decreased electric-field intensity while another point showed the opposite. After lining the chamber's ceiling and for walls with about 13000 fer... View full abstract»

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