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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)
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  • A new thrust in radar EMC design for the twenty first century

    Publication Year: 1989, Page(s):240 - 247
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A review is presented of the technical requirements of MIL-STD-469 (Radar Engineering Design Requirements-Electromagnetic Compatibility), and the Radar Spectrum Engineering Criteria (RSEC) of the National Telecommunications and Information Administration (NTIA) both of which are intended to restrict the radiated emissions spectra of defense radars to enhance electromagnetic compatibility, with oth... View full abstract»

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  • Automated cable coupling analysis software for EMC prediction

    Publication Year: 1989, Page(s):294 - 298
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Electromagnetic (EM) coupling between cables containing shielded twisted pairs can cause system degradation, i.e., powerline noise induced onto cables used for communication. Software that uses mathematical models of differential- and common-mode coupling between shielded twisted pairs is described. The differential-mode coupling model is derived from Ampere's law and the Biot-Savart law. The comm... 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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  • Congruence of low voltage power main transient designs

    Publication Year: 1989, Page(s):285 - 293
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    It is argued that the conditions and problems for high-voltage protection in the 1920s to 1940s are similar to those prevailing today for low-voltage (under 1000 V RMS) power system transient protection. Data are now being collected beyond voltage crest values vs. occurrence rate such as: waveshape epoch, rate of rise, ringing periods, energy, and energy spectral density. Protection design is comp... View full abstract»

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  • Combining automated monitoring with a national licensing database for radio spectrum enforcement

    Publication Year: 1989, Page(s):228 - 233
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The Canadian National Licensing Database and Radio Frequency Allocation Plan are used with a specialized culling computer program to generate a list of frequencies to be monitored. This list consists of unassigned frequencies within a geographic area. These frequencies are then loaded into an automated monitoring system which obtains occupancy data under computer control. The onboard computer in t... View full abstract»

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  • The new SAE J1816 for measurements of narrowband electromagnetic emissions from land vehicles

    Publication Year: 1989, Page(s):279 - 284
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The Society of Automotive Engineers (SAE) procedure J1816 `Performance Levels and Methods of Measurement of Electromagnetic Radiation from Vehicles and Devices, Narrowband, 10 kHz to 1000 MHz' is summarized in total and the essential parts of the measurement methods and limits are described specifically. Its contents are listed, and the reasoning behind the methods is explained. The performance le... View full abstract»

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  • Lightning protection testing of the E-6 wing tip antenna pod/HF probe

    Publication Year: 1989, Page(s):59 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    A brief summary is presented of lightning tests conducted on the US Navy E-6 aircraft wing tip antenna pod/HF probe in accordance with MIL-STD-1757 to demonstrate compliance with MIL-B-5087B lightning protection requirements. The tests were conducted on a 22 ft full-sized electrically representative model of the pod/HF probe. Three types of tests were conducted. Long arc attachment tests (MIL-STD-... 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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  • A novel differential mode rejection network for conducted emissions diagnostics

    Publication Year: 1989, Page(s):223 - 227
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A differential mode rejection network (DMRN), a device which separates common mode noise from differential mode noise in a line impedance stabilization network (LISN)-based conducted emissions setup, is described. Although it is not a filter, its function is analogous to that of a filter. The DMRN filters out differential mode, and passes common mode unfiltered. The differential mode is attenuated... View full abstract»

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  • Survey of conducted transients in the electrical system of a passenger automobile

    Publication Year: 1989, Page(s):271 - 278
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    As part of an effort to develop automotive electromagnetic compatibility (EMC) test procedures for evaluating conducted emissions and conducted susceptibility at the component level, an extensive survey of the electrical transients was conducted at various locations within the electrical/electronic system of a late-model automobile. Simultaneous measurements were made at selected potential sources... 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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  • 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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  • 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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  • 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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  • 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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  • Simulating open area test site emission measurements based on data obtained in a novel broadband TEM cell

    Publication Year: 1989, Page(s):171 - 177
    Cited by:  Papers (30)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    A type of electromagnetic compatibility (EMC) test chamber for both radiated emission and susceptibility measurements is discussed. The design is essentially a transverse electromagnetic cell (TEM-cell) anechoic-chamber hybrid. A steady input power generates an almost constant field (better than +/-4 dB) anywhere in the recommended test volume from DC to frequencies exceeding 1 GHz. Susceptibility... View full abstract»

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  • Progress in the development of HEMP protection standards for C3I facilities

    Publication Year: 1989, Page(s):52 - 53
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    A brief summary is presented of US Department of Defense (DOD) efforts for standardizing a high electromagnetic pulse (HEMP) radiation hardening approach for critical fixed ground-based command, control, and communication and intelligence (FGBC3I) facilities. The approach adopted by DOD for hardening FGBC3I facilities is called the low-risk hardening approach. This approach r... 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 (1)
    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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  • 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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  • Modeling of electromechanical and electromagnetic disturbances in DC motors

    Publication Year: 1989, Page(s):258 - 262
    Cited by:  Papers (5)
    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 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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  • The effects of ground screen termination on OATS site attenuation

    Publication Year: 1989, Page(s):166 - 170
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A description is given of a 10-m open-area test site (OATS) for measuring radiated electromagnetic emissions from computing devices. The test site, located in southeastern Minnesota, is described. Its performance is analyzed by comparing horizontal and vertical site attenuation measured at the site to a theoretical model. The impact of the ground screen is examined by analyzing site attenuation da... 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 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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