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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)
    Freely Available from IEEE
  • 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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  • 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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  • 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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  • Semi-automatic measured statistics for demodulation RFI in inverting operational amplifier circuits with and without suppression capacitors

    Publication Year: 1989, Page(s):418 - 425
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    A description is given of an investigation to determine statistical variations for radio frequency interference (RFI) demodulation responses in operational amplifier (op amp) circuits. 50% amplitude-modulated (AM) RF signals were injected into the op amp signal input terminal to produce undesired demodulated responses at a 1 kHz AM frequency. The RF frequency was varied over the range 0.1 to 400 M... 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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  • 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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  • 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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  • Shielding effectiveness measurements for an SHF/EHF field-to-wire coupling model

    Publication Year: 1989, Page(s):414 - 417
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The Intrasystem Electromagnetic Compatibility Analysis Program (IEMCAP) is a widely used code for electromagnetic compatibility (EMC) modeling. IEMCAP includes a coupling model for an external field incident on a wire over a ground plane (field-to-wire model). To expand the capability of IEMCAP in the SHF/EHF region, the frequency range of the field-to-wire model was increased to 40 GHz. Since the... View full abstract»

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  • Excitation of aircraft for hardness surveillance using the aircraft's own HF antenna

    Publication Year: 1989, Page(s):87 - 89
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A technique is reported for testing the electromagnetic radiation hardening of aircraft. The electromagnetic excitation of the aircraft is accomplished by driving the aircraft's high-frequency (HF) antenna at the fundamental resonant frequency of the aircraft. Surface magnetic fields in the range of 1 to 10 mA/m were easily produced with 15 W of RF power. In addition to exciting the fundamental re... View full abstract»

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  • Performance of wire mesh gaskets with air-inflatable core

    Publication Year: 1989, Page(s):36 - 39
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Results are presented from tests of a prototype wire-mesh electromagnetic interference (EMI) gasket with an inflatable core. The gasket is constructed of several layers of wire mesh woven around an air-inflatable rubber core. The wire mesh is made of tin-coated copper-clad steel. It is noted that all testing was performed in an environmentally controlled area. The purpose was to examine the core m... 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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  • 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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  • 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 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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  • Stress loading test facility

    Publication Year: 1989, Page(s):410 - 413
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The need to conduct realistic, efficient EMC system tests on large command, control, communications, and intelligence (C3I) systems has led to the development of a stress loading facility (SLF) by the US Army Electronic Proving Ground at Fort Huachuca, Arizona. The SLF is a low-power, radio-frequency (RF), hardware simulation facility for testing the response of electronic equipment to ... View full abstract»

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  • Measuring the shielding effectiveness of superconductive composites

    Publication Year: 1989, Page(s):380 - 382
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The results are presented of a preliminary investigation into the measuring of shielding effectiveness of YBa2Cu3O 7-x both as a composite and as a monolithic material. A flanged coaxial test fixture was selected to measure the shielding. The composite samples showed little or no shielding. The monolithic sample showed substantially less shielding than predicted. P... View full abstract»

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  • The effect of dipole coupled impedances on open field range calibration

    Publication Year: 1989, Page(s):16 - 18
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The half-wave dipole is the fundamental antenna used in the calibration of open-field test sites. Coupling among the antennas and their images causes a change in antenna center impedance, resulting in a correction of several decibels in the site attenuation model. A derivation of the method of calculating the effect of the coupled impedances is given along with a discussion of the correlations bet... View full abstract»

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  • R2SPG-a new technique for measuring upset susceptibility thresholds of large systems

    Publication Year: 1989, Page(s):83 - 86
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    An in-situ system-level upset test technique has been developed that uses a random repetitive square wave pulse generator (R2SPG) as a broadband simulator. In the proposed technique current is inductively coupled to cables or cable bundles and is easily controllable from amplitudes of 10 mA to 16 A peak-to-peak. The waveform is a broadband transient that approximates a damped square wav... View full abstract»

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  • Application of the optical black-hole principle to the estimation of shielding effectiveness to radio frequency energy

    Publication Year: 1989, Page(s):33 - 35
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The interior of a typical shielded enclosure is usually densely filled with interconnected electronic subassemblies each contained within its own shielded container and pretested to have a specified shielding effectiveness in a free-space environment. The problem of estimating the overall shielding effectiveness when these subassemblies are placed inside the shielded enclosure is discussed. An opt... 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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  • 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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  • 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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  • 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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  • 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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