Scheduled System Maintenance:
On May 6th, single article purchases and IEEE account management will be unavailable from 8:00 AM - 12:00 PM ET (12:00 - 16:00 UTC). We apologize for the inconvenience.
By Topic

Electromagnetic Compatibility, IEEE Transactions on

Issue 4 • Date Nov. 1995

Filter Results

Displaying Results 1 - 17 of 17
  • Comments on "Shielding effectiveness of conductive polymers

    Publication Year: 1995
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (69 KB)  

    The authors comment that K. Naishadham (see ibid., vol.34, no.1, p.47-50, 1992) calculated the plane-wave shielding effectiveness of conductive polymers as a function of frequency. As indicated, a comparison to the measured result of the DC conductivity indicates that the microwave conductivity at room temperature is within a small percentage of the DC result, and therefore can be used for a wide frequency range. The conductivity of the polymers is given by /spl sigma/=2/spl pi/f/sub 0//spl epsiv//sub 0//spl epsiv/" and is assumed invariant for all frequencies. Based on the invariability of polymers' conductivity for all frequencies, they calculated the shielding effectiveness of the polymers. Discrepancies are found by comparing these figures to those of Naishadham. It is concluded that shielding effectiveness calculated by Naishadham was done under the assumption of frequency-invariant /spl epsiv/" instead of /spl sigma/. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive absorbing boundary conditions in finite-difference time domain applications for EMC simulations

    Publication Year: 1995 , Page(s): 580 - 583
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    A special adaptation of the Liao's (1984) absorbing boundary condition (ABC) is presented to optimize the solution of a class of EMI/EMC problems when using the finite-difference time domain (FDTD) method. The Liao ABC is constructed on a per-cell basis to accommodate the most likely direction of incidence on the mesh terminating boundary. Numerical results are presented to demonstrate the validity of the formulation and the improvements over traditional ABC applications View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A finite-element time-domain method using prism elements for microwave cavities

    Publication Year: 1995 , Page(s): 519 - 527
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (628 KB)  

    A finite-element time-domain (FETD) method for solving Maxwell's equations was developed by combining prism-based edge elements with central differencing in the time domain. This method solves for the electric field as a vector function of space and time in finite cylindrical cavity geometries of arbitrary geometry. Two stability analyses of this method are performed using the growth factor technique and the Z-transform. Furthermore, the computational complexity of the present approach is also investigated, This method has been implemented and its validity tested by studying the resonant frequencies of various microwave cavities View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bounds on aperture coupling from radar and other EM pulses

    Publication Year: 1995 , Page(s): 543 - 546
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    Bounds on the energy that can be transmitted through an aperture have been calculated for a rectangular RF pulse, a damped-sine pulse and an inverse exponential pulse. The bound obtained for the penetration of the rectangular RF (radar) pulse is shown to be the sum of two terms; the first representing the energy that would be transmitted if the pulse was monochromatic and the second representing a correction for the distribution of frequencies that results from the finite duration of the pulse View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Linear two-wire transmission line coupling to an external electromagnetic field. I. Theory

    Publication Year: 1995 , Page(s): 559 - 566
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1336 KB)  

    The telegrapher's equations have been derived electrodynamically for the transmission line of two linear parallel conductors separated by a dielectric layer and excited by an electromagnetic field. The line coupling to a plane electromagnetic wave is illustrated for an arbitrary orientation of Poynting's vector and various polarization angles. The results are compared with the ones of other papers. The role of the magnetic field, while exciting the line, is clarified. The equations obtained in the paper are solved analytically in the case of the line excitation source being an electromagnetic pulse of arbitrary form View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the prediction of digital circuit susceptibility to radiated EMI

    Publication Year: 1995 , Page(s): 528 - 535
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (776 KB)  

    The effects of radiated radio-frequency interference (RFI) on the operation of digital systems are studied by simulating the response of simple logic circuits to incident plane waves. The simulation is accomplished by combining a linear electromagnetic moment-method model of the wire structure with a nonlinear circuit model of the solid-state components. The complete model is analyzed in the linear and nonlinear regimes as an example. It is shown how a circuit simulator, such as SPICE, can be used in the analysis of an arbitrary wire network loaded with logic circuits, by the process of representing the linear wire network as a lumped-element N-port π network and interfacing it to the nonlinear circuit simulator. Examples are given that demonstrate the occurrence of both static and dynamic failures under various RFI-field excitations and wire structure geometries. The prediction methods presented in this paper, can be used by EMC engineers to assess the likelihood of failures in RFI-exposed digital systems, View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electromagnetic absorption in the human head from experimental 6-GHz handheld transceivers

    Publication Year: 1995 , Page(s): 547 - 558
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1208 KB)  

    We have used a new millimeter-resolution MRI-based model of the human body to calculate the electromagnetic absorption in the head and neck for three experimental Yagi antennas suggested for handheld transceivers of a proposed 6-GHz personal communication network (PCN) system. The SAR distributions are obtained with a resolution of 1.974×1.974×1.5 mm for transceivers that are held against the ears and tilted forward by 33°. The finite-difference time-domain technique is used to calculate the EM fields and SARs for the transceiver, antenna, and head and neck coupled region that is divided into 158×84×188 or nearly 2.5 million cells. The highlights of the numerical calculations are verified by means of a head-shaped experimental model made of tissue-equivalent materials simulating the electrical properties (εr,σ) of the skull, brain, muscle, eyes, and ears developed for use at 6 GHz. Because of the proximity to the antenna, the highest SARs are obtained for the upper part of the ear. For a planned radiated power of 0.6 W, the peak SARs averaged over any 1 g of tissue defined as a tissue volume in the shape of a cube are on the order of 0.5-1.0 W/kg for two of the proposed antennas and considerably higher (2.06 W/kg) for the third antenna using a narrower off-axis reflector. Low SARs for the first two antennas are likely due to the shielding provided by the relatively wider strip reflector plates used for these antennas View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electromagnetic field coupling to a line of finite length: theory and fast iterative solutions in frequency and time domains

    Publication Year: 1995 , Page(s): 509 - 518
    Cited by:  Papers (50)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (736 KB)  

    A system of integral-differential equations for evaluating currents and voltages induced by external electromagnetic fields on a finite-length horizontal wire above a perfectly conducting ground is derived under the thin wire approximation. Based on perturbation theory, an iterative procedure is proposed to solve the derived coupling equations, where the zeroth iteration term is determined by using the transmission line (TL) approximation. The method can be applied both in the frequency and in the time domains. The proposed iterative procedure converges rapidly to the exact analytical solution for the case of an infinite line, and to the NEC solution for a line of finite length. Moreover, with only one iteration, an excellent approximation to the exact solution can be obtained. The method is applied to assess the validity of the TL approximation for plane wave coupling to an overhead line of finite length. It is shown that the resulting errors for the early-time response are generally higher than those corresponding to infinite lines View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A simplified approach to determine the amplitude of the transient voltage induced on a cable bundle

    Publication Year: 1995 , Page(s): 497 - 504
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB)  

    Studies the transient response of a multiconductor transmission line, by using the formalism of multiple reflections. This often requires an experimental characterization of the cable bundle that becomes tedious for a large number of conductors, In order to reduce the experimental task, the authors bring two simplifications: the first one is based on the approximation of totally degenerate modes, the second one on the approximation of semi-degenerate modes, Then, some experiments with real bundles have been achieved to validate these simplifications View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of a cyclic contact resistance test device

    Publication Year: 1995 , Page(s): 596 - 599
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    The design and operation of a cyclic contact resistance test device for electromagnetic gasket materials is described. The device and associated instrumentation provide unique capabilities to measure electrical contact resistance for up to ten gasketed test assemblies as a function of make-and-break cyclic loading of the contacts. Resistance results for a custom gasketed contact design demonstrates that the test method is sensitive to both materials and lubrication used in the contact joint. The gasket cycler test system was designed and constructed to simulate the closure forces and mating action encountered by EMI gaskets in shielded facility access doors, hatchways, and cover panels View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Penetration of a low-frequency E-wave into a conducting circular cylinder

    Publication Year: 1995 , Page(s): 536 - 542
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    We study the progressive penetration of current in a good conductor as the penetration depth a increases. More specifically, we perform this task for the canonical problem of a circular cylinder immersed in a low-frequency incident E-wave. The material of the cylinder is a nonmagnetic good conductor, and we examine the evolution of quantities such as the fields at the surface and the radiative losses. Particular attention is devoted to the limits δ→0 (which corresponds to a perfect conductor) and δ→∞ (which leads to the cylinder becoming transparent) View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transient field coupling and crosstalk in lossy lines with arbitrary loads

    Publication Year: 1995 , Page(s): 599 - 606
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (716 KB)  

    We extend the transient scattering analysis of a lossy multiconductor transmission line to the evaluation of the interference produced by a field illuminating the line. The external interference is described by suitable voltage wave sources that are readily computed in the time domain and do not affect the structure of the transient scattering equations. The proposed formulation fully exploits the advantages of the transient analysis based on the line matched scattering parameters, dealing effectively with low-loss lines and helping the understanding of the interference mechanism through the physical interpretation of the results. The simplicity and efficiency of our approach is evidenced by means of a numerical example of the external interferences on a realistic nonlinearly loaded highly mismatched 3-conductor interconnect View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electromagnetic pulse signal representation using orthonormal Laguerre sequences

    Publication Year: 1995 , Page(s): 592 - 595
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    The notion of representing discrete-time electromagnetic pulse (EMP) signals using orthonormal Laguerre sequences is introduced. The motivation for doing so is that EMP signals and Laguerre sequences are both characterized by decaying exponentials. It is shown a that very efficient Laguerre representation of EMP signals is possible using this approach View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the contribution of the electromagnetic field components in field-to-transmission line interaction

    Publication Year: 1995 , Page(s): 505 - 508
    Cited by:  Papers (37)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    Based on the transmission line approximation, three different equivalent formulations have been proposed for evaluating the interaction between an external electromagnetic field and a transmission line, The difference among these “coupling” formulations, which are summarized for the case of a lossless line, lies essentially in the representation of the source terms as a function of the external electromagnetic field components. The authors show that the contribution of a given electromagnetic field component is different depending on the particular adopted formulation, To show that, the three formulations are employed to calculate the voltages induced on an overhead line by a nearby lightning strike, and the contribution to the induced voltage of the various electromagnetic field components explicitly appearing in each formulation is emphasized. The authors conclude that it is misleading to speak about the contribution of a given electromagnetic field component to the total induced voltages without first specifying the coupling formulation one is using View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • RF interference effects on PIN photodiodes

    Publication Year: 1995 , Page(s): 589 - 592
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    RFI effects on PIN diodes were studied experimentally for various light powers. It is shown that by operating a diode in a photovoltaic mode it is much more susceptible to RFI than by operating it in a photoconductive mode. The RF-frequency and RF-power dependences of the interference effect are illustrated. A method of predicting the combined effects of light illumination and RFI is suggested. Methods of avoiding this interference are discussed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Principles of quasistatic magnetic shielding with cylindrical and spherical shields

    Publication Year: 1995 , Page(s): 574 - 579
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    The basic principles that underlie materials-based quasistatic magnetic shielding are described. Shielding mechanisms are identified and shown in specific examples that involve long cylindrical and spherical shield geometries. Analytic results are given both for shields that enclose the shielded region and for shields that enclose the source. The two configurations are reciprocal in the sense that identical shields have identical shielding factors for a uniform externally applied field and for a dipole source within the shield. Flux shunting and induced current shielding mechanisms are each described quantitatively and qualitatively in shielding situations where only one mechanism is involved. Situations where the mechanisms are simultaneously involved are then analyzed, and the relevances of the descriptions that involve only one mechanism are identified as regimes within the general descriptions View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the leakage radiation from a circumferentially-slotted cylinder and its application to the EMI produced by TEM-coaxial rotary joints

    Publication Year: 1995 , Page(s): 583 - 589
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (756 KB)  

    The amount of leakage radiation, as well as the radiation pattern and its gain, produced by a complete 360° circumferential-narrow gap cut in a coaxial cable carrying a TEM mode is determined. Leakage levels for such a typical cable of approximately 26% are predicted to occur for gaps as small as about 0.0074λ. The former is substantiated by measurement on a ⅞" diameter coaxial cable of 50 Ω characteristic impedance operating at 2 GHz. Estimates of the EMI levels produced by typical coaxial choked-rotary joints (where the chokes significantly decrease the gap leakage) operating at high power levels are then given View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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