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Electromagnetic Compatibility, 1989., IEEE 1989 National Symposium on

Date 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
  • 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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  • Calculation of energy in transient overvoltages

    Publication Year: 1989, Page(s):217 - 222
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    It is argued that the calculation of the energy in a transient overvoltage using the time integral of V2(t)/Z, where Z has the default value of 50 Ω and the voltage, V(t), is that between the hot conductor in the AC line and ground, is inaccurate. A quantitative error analysis is presented that uses an artificial AC line networ... 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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  • Effects of cable and peripheral placement on radiated emissions

    Publication Year: 1989, Page(s):351 - 356
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A number of antenna geometries are examined for radiation resistance and input reactance. More importantly, the effects of apparently small changes are evaluated to determine the frequency dependence of the equipment under test antennas. The models given are evaluated for frequencies up to 100 MHz; this the region where most cable-related effects are observed. The geometries considered are normali... View full abstract»

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  • The effect of duty cycle on SMPS common mode emissions: theory and experiment

    Publication Year: 1989, Page(s):211 - 216
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The theoretical time- and frequency-domain waveforms of common-mode conducted emissions are derived for a switched mode power supply (SMPS) of arbitrary duty cycle. The dependence of common-mode emissions on duty cycle and switching frequency is derived, modeled, and verified through experimental data. A special fly-back converter was built to isolate the switching transistor heat-sink parasitic c... View full abstract»

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  • Assessment methodology for radio frequency effects (RFE)

    Publication Year: 1989, Page(s):137 - 142
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The concept of radio frequency interference (RFI) is expanded to include RF damage or radiofrequency effects (RFEs). An assessment methodology was developed to predict the RF power density incident on a system that would cause upset or damage to the system electronics. This RFE assessment methodology is based on a modified version of the methodology used for electromagnetic pulse assessments. In t... View full abstract»

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  • Cross-talk and ringing on a multilayer PCB

    Publication Year: 1989, Page(s):347 - 350
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A description is given of a new release of Greenfield, a family of analog simulation software tools that simulate the behavior of multilayer printed-circuit boards (PCBs) under high-speed switching conditions. Per unit length inductance, capacitance and resistance matrices-for systems of coupled multiconductor microstrips and striplines-are produced by the two-dimensional Green's function boundary... 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 (6)  |  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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  • Wideband RF-leakage test method for cables

    Publication Year: 1989, Page(s):367 - 372
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Electromagnetic leakage from coaxial cables, (i.e. shielding effectiveness of coaxial cables) was successfully measured as an absolute value over a frequency range from 4 GHz to 18 GHz using a simple, compact test system composed of parabolic cylinder reflector antennas. In combination with a regular vector network analyzer and high-frequency power amplifier, this system allows shield-effectivenes... 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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  • Electrostatic discharge research at the University of Ottawa

    Publication Year: 1989, Page(s):343 - 346
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    An experimental system developed at the University of Ottawa to measure the fields radiated by the electrostatic discharge (ESD) spark is described. Its key features are a Tektronix 7912HB transient digitizer with 750 MHz single-shot bandwidth for voltage measurement, and a broadband time-domain electric-field sensor. The system is modeled in four parts: (1) a source of charge, (2) a spark gap, (3... 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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  • Thermo-optic designs for microwave and millimeter-wave electric-field probes

    Publication Year: 1989, Page(s):7 - 11
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Various thermooptic designs are considered for electric-field probes for the approximate frequency range of 1-110 GHz. The designs are all based on using an optically sensed thermometer to measure the temperature rise of a resistive material in an electric field. Calculations of the sensitivities of the different designs, measurement results for the most easily fabricated design, and a discussion ... View full abstract»

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  • Open area EM field measurements for radiation hazard purposes

    Publication Year: 1989, Page(s):178 - 181
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    Data are presented from the measurement of electromagnetic (EM) radiation pollution for radiation hazard assessment. The measurement data are compared to international standards. regulations, and laws. Special attention was devoted to the measurement of the EM fields near hospitals. It is felt that the effect of field levels currently allowed for the Italian population could be, in some cases, ver... View full abstract»

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  • Criteria and designs for surge couplers and back-filters

    Publication Year: 1989, Page(s):202 - 207
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A review is presented of the principal areas in which surge coupling and filtering problems exist. It is proposed that each coupling mode be described in terms of the displacement of every line in the system with respect to ground. Rules are developed for specifying and designing surge coupling configurations, so that different surge test equipment can produce the same test results for a given pie... View full abstract»

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  • A method for examining failed (shorted) transient voltage suppressors to determine the destructive pulse characteristics

    Publication Year: 1989, Page(s):108 - 112
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A method is described for estimating the characteristics of pulses which were destroying transient voltage suppression (TVS) devices onboard the B-52 bomber aircraft. The method relies entirely on an analysis of the physical damage done to serviceable TVS devices in the laboratory under controlled conditions. A photographic record was made and then compared to the field-damaged and laboratory-dama... View full abstract»

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  • An innovative method for quantifying spectrum use

    Publication Year: 1989, Page(s):234 - 239
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A method is presented for quantifying and graphically portraying the extent of use of a frequency band by existing radiocommunication systems. The spectrum use factor quantifies the resources used in a frequency band at a specific location and is defined as the fraction of the total spectrum resources in a frequency band used by existing radiocommunication systems. A computer model calculates the ... View full abstract»

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  • Electromagnetic characterization of three RF leak detectors

    Publication Year: 1989, Page(s):363 - 366
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Three electromagnetic leak detectors have been evaluated as quantitative hardness surveillance tools. The leak detectors included a low-frequency (150 kHz) twin-loop system that measured shielding effectiveness according to the MIL-STD-285 definition, a unit that used skin current injection and a ferrite coil sensor, and a transmitter/receiver that operated in the UHF range (462 MHz). First, the e... 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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  • Overlapping dyadic drift

    Publication Year: 1989, Page(s):252 - 257
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The discrete Walsh transform is defined over a finite interval and produces undesirable blocking effects in digital image processing. It is shown how significant improvement can be obtained in eliminating the blocking problem by introducing the overlapping matrix Q and its false inverse Q¯ for dyadic drift Walsh functions. This is applied to a two-dimensional overlapping sequency filter and a... 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 U... 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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  • Electrical stability during vibration and electromagnetic pulse survivability of silver-plated glass bead filled EMI shielding gaskets

    Publication Year: 1989, Page(s):40 - 45
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Commercial sources of conductive silicone gaskets for electromagnetic interference (EMI) shielding filled with silver-plated glass microspheres were highly stable under conditions of severe vibration and intense simulated electromagnetic pulse (EMP). The results are in contrast to data published by C.H. Kuist (1977) and may demonstrate a considerable advancement in EMI gasket and conductive filler... View full abstract»

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  • Corporate EMC programs

    Publication Year: 1989, Page(s):320 - 325
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The author presents ideas on how to set up a corporate electromagnetic compatibility (EMC) program. Corporate interactions with the US Federal Communications Commission (FCC) regarding product emission limits and certification are briefly reviewed. Emphasis is on the impact an EMC program will have on a corporation, the complete process flow resulting in proper product designs, and how it interrel... View full abstract»

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