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Electromagnetic Compatibility, IEEE Transactions on

Issue 2 • Date May 1975

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Displaying Results 1 - 17 of 17
  • Table of contents

    Publication Year: 1975 , Page(s): c1
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  • IEEE Electromagnetic Compatibility Group

    Publication Year: 1975 , Page(s): c2
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  • A Method of Detecting Significant Sources of Intermodulation Interference

    Publication Year: 1975 , Page(s): 47 - 50
    Cited by:  Papers (7)
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    A method of detecting significant sources of ship topside intermodulation is presented which represents a major extension in capability and ease of use. The method involves a two-frequency test procedure and the use of elementary direction finding techniques. Deliberate concentration on interfering signals of the high order is the basis of the method. A computational scheme is presented which permits the determination of the lowest intermodulation product or order contributing to a given interfering signal. View full abstract»

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  • Power Line Conducted Interference Measurement Differences Using U. S. and CISPR Line Impedance Stabilization Networks

    Publication Year: 1975 , Page(s): 50 - 53
    Cited by:  Papers (1)
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    Measurements of power line conducted interference are commonly made on commercial equipment throughout the world using line impedance stabilization network (LISN's) in accordance with industrial and governmental procedures. Procedures in the United States applying to the 0.15-30 MHz frequency range specify an LISN that presents a frequency-dependent RF impedance to the equipment under test (EUT) whereas other national practices specify as LISN having an invariant 150-ohm impedance. This paper explores the expected measurement differences resulting from use of the two LISN's for power line interference measurements. Calculated difference factors, which depend on the EUT power line RF-input impedance, are developed. The factors have utility in assessing expected conducted interference levels in one LISN measurement configuration, given the interference levels and impedance parameters of the other. Measurement differences, in addition to those introduced by the LISN, which are attributed to variations in specified field strength meter parameters (i. e., detector, bandwidth, mechanical time constants, etc.) are beyond the scope of this paper. View full abstract»

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  • Ignition Noise Measurements in the VHF/UHF Bands

    Publication Year: 1975 , Page(s): 54 - 64
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1709 KB)  

    In the operational use of mobile communication terminals, it may often be unavoidable to park them in a location where they would be subject to ignition noise due to local traffic. This type of noise causes errors in digital systems. Since it is impossible to define a general model for impulsive noise, one must measure the necessary statistical paramaters to be used for calculating its effect on a communication link. Although these parameters vary for different types of links, peak amplitude distribution, time distribution, and duration of impulses at various amplitude levels should be known. In this paper noise amplitude distribution (NAD) measurements carried out on the VHF/UHF bands for ignition noise are explained. The information derived from the NAD is the peak amplitude distribution of the impulses; in addition, the average repetition frequency of the impulses is also obtained. An analytical expression is found for the probability density function of the idealized NAD. View full abstract»

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  • Effects of Impulsive Noise on Phase-Locked Loop FM Demodulator

    Publication Year: 1975 , Page(s): 65 - 71
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    The effects of impulsive noise on phase-locked loop (PLL) FM demodulators is investigated. The PLL FM demodulator used for the experiments is basically a second order loop employing an active filter. The impulsive noise used for this work is ignition noise. Impulse response of the receiver is investigated and the PLL FM demodulator is digitally simulated. The response of the receiver employing the PLL FM demodulator used in the ground terminal to an input signal consisting of unmodulated carrier and impulses is investigated experimentally. The system margin is fouind to be degraded by about 10 dB. View full abstract»

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  • Shielding Effectiveness of Braided-Wire Shields

    Publication Year: 1975 , Page(s): 71 - 77
    Cited by:  Papers (44)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2261 KB)  

    An analysis of the shielding effectiveness of braidedwire shields is made using the parameters of the woven wire and the theory of electromagnetic coupling through small irises. The coupling through the rhombic-shaped holes in the braid is approximated by using the electric and magnetic polarizabilities of elliptical holes of the same width and length as the rhombus. The analysis develops the transfer impedance and the mutual capacitance of the shield. The transfer impedance is calculated and plotted for shields of different optical coverages. The variation of mutual capacitance and mutual inductance with the weave angle of the braid are examined. View full abstract»

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  • Analysis of Airborne VHF Incidental Noise over Metropolitan Areas-Part II: Horizontal Dipole Antenna

    Publication Year: 1975 , Page(s): 77 - 84
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    Computation of the incidental, quasi-peak electric field intensity detected by an airborne, tuned, horizontal dipole antenna has been performed using a symmetrical representation of measured, surface man-made incidental radio noise data and the radiation field integral for the observed power at a height, h, above the surface. The derived electric field intensity as a function of observer altitude is compared with the results of four sets of measurements obtained over central Tokyo by Ishida for heights lying between 0.3 and 3 km. The comparisons reveal that the dependence upon altitude of the predicted quasi-peak electric field strength agrees with the observed trends and, further, that the measured and predicted field intensities display an average difference of less than 0.7 dB. These results and experimental comparisons for a tuned, airborne, horizontal dipole antenna complement the experimental confirmations of a comparable analysis previously reported for vertical, tuned, airborne dipole and monopole antennas. View full abstract»

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  • Numerical Analysis of a Transmission Line EMP Simulator

    Publication Year: 1975 , Page(s): 85 - 92
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1073 KB)  

    A theoretical model is defined for an electromagnetic pulse (EMP) simulator for testing EMP effects on high altitude satellites. The simulator is composed of three flat-plate transmission line sections. The first and third sections are tapered to accommodate, respectively, a generator and a terminating resistor. This problem is analyzed in the frequency domain over those frequency components which are known to contribute most significantly to a typical EMP waveform. The analysis uses a numerical technique to solve the basic problem of an unknown current distribution on a curved, tapered strip, excited by a known electric field. The unknown current is solved by the method of moments, using triangular basis functions. As a check, input impedances are computed for the triangular dipole, showing good agreement with experimental results. For the transmission line simulator, computed input impedance, VSWR, power dissipated in the terminating resistor, and the power lost to radiation are presented as a function of frequency. The computed current distributions are used to calculate the electric fields between and immediately beyond the parallel plates. Although a considerable portion of power is converted to radiation at the higher frequencies, it is shown that at least within the working volume the electric field maintains a reasonably constant level. View full abstract»

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  • Interaction of Electromagnetic Transient Radiation with Biological Materials

    Publication Year: 1975 , Page(s): 93 - 97
    Cited by:  Papers (8)
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    The transmission characteristics of transient electromagnetic pulses in biological material are studied using a plane wave pulse incident normally on a semi-infinite layer model. With the dispersion properties of complex tissue dielectric constants taken into account, the steady state transfer function was examined as a function of frequency. Integral solutions for the transmitted field of a Gaussian pulse were obtained through Fourier transformation. The transmitted waveforms inside muscle were determined numerically for various depths pertinent to biological situations. The results suggest that incident pulse experiences severe reflection at the airtissue interface and, shorter pulses are transmitted more readily than longer ones. For an incident pulse of 50 kV/m and 1 us in pulsewidth, the transmitted amplitude is 221 V/m. View full abstract»

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  • The Electromagnetic Field Very near to a Monopole

    Publication Year: 1975 , Page(s): 97 - 105
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1407 KB)  

    The near-zone field components 27¿¿ | H¿ (¿;z) |, 27¿¿ | E¿(¿;z) | and 2(¿/ß) | Ez(¿;z) | are determined numerically for a monopole of length h and radius a erected vertically over a perfectly conducting half-space of infinite extent. Curves are supplied for the field under the following conditions: (a) ßh = ¿/2, ¿ = 2 ln (2h/a) = 8.531, a/¿0 = 7.022 × 10-3, 1.01 ¿ ¿/a ¿ 100, 0 ¿ z ¿ h; (b) ßh = ¿,¿ = 9.917, 1.01 ¿ ¿/a = 100, 0 ¿ z ¿ h. Here ß = 2¿/¿0 is the free-space propagation constant. Unit voltage is applied to the base of the monopole by means of a coaxial cable having a characteristic impedance of Zc = 50 ohms. View full abstract»

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  • Range-Doppler Resolution of Electromagnetic Walsh Waves in Radar

    Publication Year: 1975 , Page(s): 106 - 111
    Cited by:  Papers (1)  |  Patents (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2117 KB)  

    A number of papers have appeared during recent years about electromagnetic waves produced by antenna currents with the time variation of Walsh functions rather than that of sinusodial functions. Experimental transmitters and receivers for such waves have been developed. There are a variety of effects of Walsh waves that do not exist for sinusoidal waves or are so obscure that they are generally not recognized. This makes a discussion of these effects difficult for the nonspecialist. The range-Doppler resolution in radar lends itself more readily to a discussion, since Walsh waves bring in this case not a new effect, but only a substantial improvement of a well-known one. It is shown that our present technology should permit an improvement of about one order of magnitude in the Doppler resolution by using carriers derived from Walsh or other two-valued functions rather than sinusoidal functions. The theoretical improvement of the relative range resolution is substantially greater since it no longer depends upon the duration of the modulating signal but upon the period of the carrier and the switching time of the carrier. The absolute range measurement is not changed. View full abstract»

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  • On the Identification of Linear Dyadic Invariant Systems

    Publication Year: 1975 , Page(s): 111 - 117
    Cited by:  Papers (5)
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    This paper draws attention to the fact that there is a one-to-one correspondence between the theory of linear time-invariant systems and linear dyadic invariant systems. It then proceeds to extend the use of random processes in conjunction with spectral analysis technique to identifying multiple input-multiple output dyadic systems. Emphasis is placed upon the role played by coherence functions in measuring the goodness of the identification. View full abstract»

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  • Contributors

    Publication Year: 1975 , Page(s): 117 - 119
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  • Membership Application Electromagnetic Compatibility Group

    Publication Year: 1975 , Page(s): 119-a
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  • G-EMC Policy

    Publication Year: 1975 , Page(s): 119-b
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  • Institutional listings

    Publication Year: 1975 , Page(s): 119c
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Aims & Scope

IEEE Transactions on Electromagnetic Capability publishes original and significant contributions related to all disciplines of electromagnetic compatibility (EMC) and relevant methods to predict, assess and prevent electromagnetic interference (EMI) and increase device/product immunity.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Professor Farhad Rachidi
Swiss Federal Institute of Technology (EPFL)
EMC Laboratory
CH-1015 Lausanne
Switzerland
Phone: +41 (0) 21 693 26 20 (direct)
+41 (0) 21 693 26 61 (secretariat)
Fax: +41 (0) 21 693 46 62
Email: Farhad.Rachidi@epfl.ch
url: http://emc.epfl.ch