By Topic

Electromagnetic Compatibility, IEEE Transactions on

Issue 2 • Date May 1978

Filter Results

Displaying Results 1 - 22 of 22
  • Table of contents

    Publication Year: 1978 , Page(s): c1
    Save to Project icon | Request Permissions | PDF file iconPDF (848 KB)  
    Freely Available from IEEE
  • IEEE Electromagnetic Compatibility Society

    Publication Year: 1978 , Page(s): c2
    Save to Project icon | Request Permissions | PDF file iconPDF (190 KB)  
    Freely Available from IEEE
  • A Technique for Determination of Filter Insertion Loss as a Function of Arbitrary Generator and Load Impedances

    Publication Year: 1978 , Page(s): 273 - 278
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1034 KB)  

    Insertion loss is derived in terms of generator impedance, load impedance, and filter open-circuit and short-circuit impedances. This expression contains a difference term which places great weight on the accuracy with which filter impedances are measured. It is shown that the use of this difference term can be avoided by introducing the filter insertion loss in a circuit with known generator and load impedances. The resulting exact expression contains terms which are easily measurable with sufficient accuracy to provide reliable insertionloss values for the filter for any combination of generator and load impedances. Also shown is a simplified approximate expression for insertion loss which is applicable in a filter attenuation band. A discussion of experimental verification of the expressions is followed by curves showing application of the approximate insertion-loss expression to a particular filter. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of Nonlinearly Loaded Multiport Antenna Structures Over an Imperfect Ground Plane Using the Volterra-Series Method

    Publication Year: 1978 , Page(s): 278 - 287
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1415 KB)  

    Volterra-series analysis is applied to nonlinearly loaded antennas over an imperfect ground plane. The nature of the imperfect ground can be taken into account either exactly by the Sommerfeld formulation or approximately by the reflection-coefficient method. After the electromagnetic-field problem is reduced to a network problem by application of the method of moments, the distributed nonlinear loads are approximated by lumped loads. The nonlinear network problem is then solved using the Volterra technique. A procedure for obtaining a time-domain solution from the frequencydomain solution without using the fast Fourier transform technique is demonstrated. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Two Parallel Terminated Conductors in External Fields

    Publication Year: 1978 , Page(s): 288 - 296
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1402 KB)  

    New equations are derived for voltage and current on two parallel conductors terminated with arbitrary impedances and immersed in external fields. By examining several pertinent static boundary-value problems, it is shown that the source terms of the equations can be split into two parts; one part is directly proportional to the transverse components of the magnetic and electric fields of the incident wave, and the other part is attributable to the unequal size of the two conductors. It is also shown that only one two-dimensional static boundaryvalue problem need be solved for the determination of the coefficients and source terms in the new equations. Detailed calculations are given for two parallel terminated cylinders. Some simple examples are worked out, and the results based on the new equations are contrasted with those derived from the conventional theory. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Shielding Theory of Enclosures with Apertures

    Publication Year: 1978 , Page(s): 296 - 305
    Cited by:  Papers (50)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1555 KB)  

    This paper develops the theory of EM radiation from metallic enclosures with apertures, excited by an internal source at frequencies below the fundamental resonance of the enclosure. The enclosure with an aperture is analyzed from two different points of view: as a cavity with a small aperture in a wall, and as a waveguide section short-circuited at one end and open at the other. Rectangular geometries are used throughout, since these are by far the most commonly encountered in practical enclosures and cabinets. Using the corresponding dyadic Green's functions, the fields generated inside the enclosure by some simple sources are determined. The fields radiated through small apertures in a cavity are determined using Bethe's theory of diffraction by small holes. The radiation from an open waveguide is calculated with the help of field-equivalence theorems, with assumptions applicable to the case of evanescent waves. The final step is to derive expressions for the " insertion loss" of the shield, defined as the ratio of the field strength at a point external to the shield, before and after the insertion of the enclosure. To do so, the effect of the shield upon the input impedance of the antenna is analyzed, and expressions obtained for the applicable cases. The resulting insertion-loss expressions are numerically evaluated for some representative cases, and graphically compared with a series of measurements performed to obtain experimental confirmation. Very good agreement is obtained in all cases, establishing the validity of the analysis. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some Aspects of Valid EMC Testing of Missiles

    Publication Year: 1978 , Page(s): 306 - 313
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1236 KB)  

    Integral-equation and numerical techniques are used to determine guidelines in valid electromagnetic compatibility (EMC) testing of missiles. Both thin-wire and body-of-revolution modeling are used. Investigated are two primary aspects. 1) If a near-zone source is used rather than plane-wave incidence, how far must the source be for valid simulation, and 2) how significant is the presence of the rocket exhaust (or plume) in determining subsystem response, and need it be included for valid EMC testing? The simulation validity conclusions reached for the models without apertures apply directly as well to the real-life body with apertures. Numerical results are given over the frequency range of 50-200 MHz to help establish guidelines on testing validity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Technical Considerations for Establishing Requirements Pertaining to Broad-Band EMI from Data-Processing Equipment and Office Machines

    Publication Year: 1978 , Page(s): 313 - 320
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1715 KB)  

    This paper extends the scope of earlier narrow-band work to include control of broad-band emission sources which can exist independently of, or in conjunction with, narrow-band sources in electronic data-processing (EDP) and office-machine (OM) equipment (products). While both narrow-band and broad-band noise sources have the potential for RF interference with communication services, our experience with broad-band problems has shown this class of sources to be much less significant than the low incidence of actual narrow-band component EDP interference problems examined in the initial paper [1]. Limits are discussed considering the empirical data base and need for international harmonization of interference requirements View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Spectrum-Amplitude Approximation for Slowly Varying Nonlinear Frequency-Modulated Pulses of Long Duration

    Publication Year: 1978 , Page(s): 320 - 327
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1945 KB)  

    A spectrum-amplitude approximation is derived for slowly varying amplitude-modulated and nonlinearly frequencymodulated pulses of long duration (by "long duration" we mean, essentially, "containing many oscillations"-perhaps thousandsirrespective of the absolute length of the pulse in seconds). The derivation consists of the application of Parseval's theorem to the waveform of interest, approximated by a sequence of linearly frequencymodulated pulses of constant amplitude. It is found that successful application of the approximation depends on the individual pulses being long enough for the changing frequency so that there is little overlap between the spectrum of one segment and that of another. Actual application of the technique can be made with a nominal average frequency from each segment. The technique is demonstrated on an experimental pulse of approximately 20 000 oscillations varying from 500 MHz down to 13 MHz in 960, ¿s. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Three-Dimensional Finite-Difference Solution of the External Response of an Aircraft to a Complex Transient EM Environment: Part I-The Method and Its Implementation

    Publication Year: 1978 , Page(s): 328 - 333
    Cited by:  Papers (45)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1056 KB)  

    Experimental charge and current measurements have recently been performed on an aircraft when it was exposed to the transient electromagnetic fi'eld of an electromagnetic pulse (EMP) simulator. These new data allow a test of the predictive capabilities of the three-dimensional finite-difference method for realistic aircraft simulator test problems. In the paper, the workings of the threedimensional finite-difference method and its required inputs and sensitivity to variations in the inputs are discussed in sufficient detail to enable others to employ the method. A companion paper compares the experimental measurements to predictions for a large variety of measurement locations. Agreement is shown to be good for all major response measurements and satisfactory for a number of other measurements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Three-Dimensional Finite-Difference Solution of the External Response of an Aircraft to a Complex Transient EM Environment: Part II-Comparison of Predictions and Measurements

    Publication Year: 1978 , Page(s): 333 - 341
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1172 KB)  

    Experimental charge and current measurements have recently been performed on an aircraft when it was exposed to the transient electromagnetic field of an electromagnetic-pulse (EMP) simulator. These new data allow a test of the predictive capabilities of the three-dimensional finite-difference method for realistic aircraft aircraftsimulator-test problems. Comparisons made between measurements and predictions show that the three-dimensional finite-difference technique provides reasonably accurate predictions for the induced currents and charges on a complex object responding to an applied transient electromagnetic field in the presence of a lossy earth. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Field-Strength Measurements of Microwave-Oven Leakage at 915 MHz

    Publication Year: 1978 , Page(s): 341 - 346
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1740 KB)  

    Measurements of electric field strength of microwave emissions from microwave ovens in the 915-MHz industrial-scientificmedical (ISM) band are reported. Field strengths were determined at 10 and 1000 ft under laboratory conditions and in the vicinity of two large condominium buildings, containing 385 ovens, in Ft. Lauderdale, Florida. Monitoring equipment consisted of dipole and log-periodic antennas feeding the input of a spectrum analyzer which was interfaced to a minicomputer system for automatic data acquisition and analysis. Under controlled conditions, the tested oven produced maximum field strengths of 123.5 dBuV/m and 81.0 dB,uV/m at distances of 10 and 1000 ft, respectively. Fields as high as 79.0 dBuVm were observed at the Florida location, approximately 500 ft from the buildings. Additional measurements were made of band occupancy and the effects of load placement in the oven, orientation of the oven, and polarization of the emerging fields. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Statistical Correlation Between Conducted Voltages on the Powerline and Those Measured with a Line-Impedance Stabilization Network

    Publication Year: 1978 , Page(s): 346 - 349
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (674 KB)  

    In measurements of physical parameters, it is not always possible to obtain consistent results because of the dependence on and interaction of a significantly uncontrolled variable element in the measurement. For consistent results to be obtained, the variation in the element may be eliminated by replacing the element with a simulated representative constant. Measurement of conducted powerline noise from electric/ electronic equipment is subject to such variation. Conducted-noise measurement procedures used in the United States, and also internationally, typically employ line-impedance stabilization networks (LISN's) which, in theory, eliminate the effects of variations in the ac power-distribution-network impedance on the measurement. The LISN is designed to be representative of the actual power-distribution- network impedance presented to equipment connected to the network. The LISN and power-network impedances are both frequency variant. Power-network impedances can assume a wide range of values at a fixed frequency, whereas the LISN impedance, assuming that any line-impedance effects are small, is a single value. This paper explores the correlation between conducted noise voltages measured in a LISN configuration and the actual noise voltages expected to be impressed on the power distribution system. The analysis is conducted at 1 MHz. The paper analytically relates the impedances of the LISN, power distribution system, and equipment. A LISN of the type used in the United States is used in the development; however, the concept and procedure presented is applicable to any LISN, frequency, and equipment. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Low-Frequency Shielding Properties of Conducting Cylindrical Shells of Arbitrary Cross Section

    Publication Year: 1978 , Page(s): 349 - 351
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (452 KB)  

    The shielding properties of general, two dimensional, finitely conducting shells with vanishingly thin walls are analyzed by the integral-equation method. For the circular cylinder case, a field plot throughout the shield interior reveals that, at the 'no shielding' frequencies found by Schieber, fields are attenuated greatly, except near the center. The influence of slots in the shell walls is also assessed for both circular and rectangular cylinders. Due to focusing effects, the field at the shield center is even stronger than the incident field at certain resonant frequencies for the slotted cylindrical shells. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Error Probability of a Binary Signal Perturbed by Intersymbol Interference and Impulsive Atomopheric Noise

    Publication Year: 1978 , Page(s): 352 - 353
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (319 KB)  

    This paper analyzes the performance of baseband polar signals in the presence of impulsive atmospheric noise and intersymbol interference (ISI). Different levels of ISI have been considered to make the analysis more meaningful. Possible explanations for the results are offered. A comparison has also been made with the system operating in Gaussian noise. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Correction to "Current and Charge Densities Induced on the Surface of a Prolate Spheroid Illuminated by a Plane Wave Electromagnetic Field"

    Publication Year: 1978 , Page(s): 354 - 355
    Save to Project icon | Request Permissions | PDF file iconPDF (159 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Correction to "Sensors for Electromagnetic Pulse Measurements Both Inside and Away from Nuclear Source Regions"

    Publication Year: 1978 , Page(s): 355
    Save to Project icon | Request Permissions | PDF file iconPDF (80 KB)  
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Contributors

    Publication Year: 1978 , Page(s): 356 - 358
    Save to Project icon | Request Permissions | PDF file iconPDF (2564 KB)  
    Freely Available from IEEE
  • An invitation to Membership

    Publication Year: 1978
    Save to Project icon | Request Permissions | PDF file iconPDF (112 KB)  
    Freely Available from IEEE
  • IEEE Conference Publications of Interest in Stock

    Publication Year: 1978 , Page(s): 358-b
    Save to Project icon | Request Permissions | PDF file iconPDF (117 KB)  
    Freely Available from IEEE
  • EMC Society Policy

    Publication Year: 1978 , Page(s): 358-c
    Save to Project icon | Request Permissions | PDF file iconPDF (149 KB)  
    Freely Available from IEEE
  • Institutional listings

    Publication Year: 1978 , Page(s): 358d
    Save to Project icon | Request Permissions | PDF file iconPDF (790 KB)  
    Freely Available from IEEE

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