Seventh International Conference on Electromagnetic Compatibility, 1990

28-31 Aug 1990

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Displaying Results 1 - 25 of 55
  • A simple model of intermodulation spectra for use on a personal computer

    Publication Year: 1990, Page(s):99 - 102
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (156 KB)

    The authors describe initial work undertaken to characterise, from an EMC point of view, the RF environment in highly cluttered industrial site environments where a large number of radio systems may be present. The initial work involves bringing together existing methods and implementing these methods in an efficient manner on a personal computer. Further work involving calibration of the model ag... View full abstract»

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  • Simulation of transmission line discontinuities for transient analysis in high speed systems

    Publication Year: 1990, Page(s):132 - 136
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (316 KB)

    The authors present methods to simulate transmission line discontinuities in the time-domain. The simulation procedures are distinguished by methods that describe discontinuities. To describe the behaviour of discontinuities, a quasi-static approach by lumped elements is used as well as a description by scattering parameters. The latter represents the general approach for the computation of discon... View full abstract»

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  • A mathematical model of concentrically loaded coaxial structures and its EMC applications

    Publication Year: 1990, Page(s):91 - 98
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (436 KB)

    Computer programs have been developed at Bristol University for modelling boxed microstrip lines. Modules from these programs have been modified and extended to produce a program which can model any uniform, symmetric, coaxial system that has multiple concentric dielectrics. The program has also been extended to model losses through the use of complex permeability and permittivity values for the d... View full abstract»

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  • A simplified low-cost materials approach to shielding in EMC applications

    Publication Year: 1990, Page(s):58 - 61
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (232 KB)

    With the advent of conductive polymers, it now appears feasible to take the basic concept of polymer concrete and make a conductive polymer concrete with tailored levels of electrical conductivity. In fact, preliminary conceptual studies point to the real possibility of arriving at a superconducting polymer concrete through the synergism achievable by the various components making up the composite... View full abstract»

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  • The vehicle body as an electromagnetic shield-numerical simulation for emission and susceptibility studies

    Publication Year: 1990, Page(s):125 - 131
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (428 KB)

    In understanding EMC in vehicles it is necessary to review briefly the external and internal environment. The external environment is either a test environment or an environment typical of road conditions. Examples of the former are EMC compliance tests in screened or anechoic rooms. The internal environment of the car can be described as a leaky metal cavity loaded with a variety of materials, e.... View full abstract»

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  • Analysis of an asymmetric TEM-cell for immunity testing

    Publication Year: 1990, Page(s):157 - 161
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (252 KB)

    An asymmetric TEM-cell is analyzed in terms of field uniformity, bandwidth and characteristic impedance. Measured values are compared with calculated values. If optimally designed, an asymmetric TEM-cell is an attractive alternative to a symmetric TEM-cell View full abstract»

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  • The development of EMC measurement from GPO to Radio Agency

    Publication Year: 1990, Page(s):87 - 90
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (224 KB)

    The author examines the history and technological advance of EMC measurement, with particular reference to the Post Office Radio Service and the evolution into the Radiocommunications Agency of the DTI. The topics covered include the use of early receiving equipment within the Radio Service and its subsequent development. Further discussion postulates on future trends as a direct result of technol... View full abstract»

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  • The Masterclass-teaching EMC in industry

    Publication Year: 1990, Page(s):243 - 247
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (256 KB)

    To raise the awareness and technical ability of design engineers, Rolls-Royce and Associates (RRA) has started an in-house teaching programme to propagate the considerable experience existing within the Company. The lecture programme is based on this experience and the knowledge of senior engineers within the Company and is called the Masterclass. The author looks at the various technical needs of... View full abstract»

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  • Observation of electromagnetic coupling and power flow in printed circuits

    Publication Year: 1990, Page(s):50 - 57
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (340 KB)

    The performance of electronic equipment is determined by the distribution of electromagnetic power in the equipment. This depends on the location and electrical parameters of the sources of power and the physical configuration and material properties of the equipment. The true distribution of power often deviates from that intended in the design, and this deviation increases with frequency. FACET ... View full abstract»

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  • Semi-anechoic chamber site attenuation calculations [EM waves]

    Publication Year: 1990, Page(s):109 - 113
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (220 KB)

    The reflectivity of an absorber-covered surface depends on the angle of incidence and the polarization as well as the frequency of the incident electromagnetic wave. The problem of calculating all of the angles involved in multiple reflection paths can be simplified by using the method of images. The author shows how the angles can be computed in a straightforward fashion using images. In addition... View full abstract»

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  • Computer aided design for radio-frequency interference reduction

    Publication Year: 1990, Page(s):140 - 143
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (272 KB)

    Describes the requirements for a computer aided design (CAD) package to predict radiated emissions from electronic equipment and to aid their reduction. Input for the package is obtained from a suite of CAD tools covering electrical and mechanical aspects of electronic equipment design. An electromagnetic solver using a method of moments technique is described and its current performance is indica... View full abstract»

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  • Remarks to the solution of EMC-problems on printed-circuit-boards

    Publication Year: 1990, Page(s):68 - 72
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (288 KB)

    The author gives a survey of the PCB design process under EMC constraints. For a better understanding of the PCB design process with respect to EMC problems the standard design process is discussed first. Based on this discussion an alternate design process including EMC problems is defined. For this approach the PCB design problems are classified first. After this discussion the present state of ... View full abstract»

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  • Helmholtz coils for EMI immunity testing: stretching the uniform field area

    Publication Year: 1990, Page(s):169 - 172
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (224 KB)

    Helmholtz coils are used to establish known, uniform magnetic fields for calibrating magnetic field sensors, for EMI immunity testing, for magnetic bioeffects research, etc. But in the past, it has been assumed that only very small devices could be tested. The paper provides information leading to an understanding of the size of the uniform field region and how to trade off field uniformity for in... View full abstract»

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  • Undergraduate student projects on determining demodulation RFI statistics for operational amplifiers

    Publication Year: 1990, Page(s):253 - 260
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (336 KB)

    A team of five undergraduate Electrical Engineering students under the supervision of a graduate student have measured RFI effects in an inverting operational amplifier (op amp) circuit with a voltage gain equal to ten for two sets of input and feedback resistor values. For the first case, the input resistor R1 is 10 kΩ, and the feedback resistor R2 is 100 kΩ. For the second case, R1 i... View full abstract»

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  • A novel technique for damping site attenuation resonances in shielded semi-anechoic rooms

    Publication Year: 1990, Page(s):119 - 124
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (248 KB)

    Presents a simple and economical technique for suppressing resonance problems in shielded semi-anechoic rooms (SSARs). The work described is an application to an SSAR of a technique developed by Dawson and Marvin for small shielded enclosures. It consists of putting lossy dielectric blocks at well-selected positions where the electric fields of the problem-causing resonant modes show up a maximum.... View full abstract»

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  • The GTEM cell concept; applications of this new EMC test environment to radiated emission and susceptibility measurements

    Publication Year: 1990, Page(s):152 - 156
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (264 KB)

    The use of a TEM-cell anechoic chamber hybrid, the GTEM cell for EMI testing, is discussed. The hybrid chamber may be used for both susceptibility and radiated emission testing and is well suited for time domain as well as continuous wave (CW) measurements. The chamber has extremely broadband characteristics, with a usable frequency range from DC to GHz (~18 GHz). The TEM mode is used to simulate ... View full abstract»

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  • Measurement and testing method for large telecommunications systems

    Publication Year: 1990, Page(s):79 - 86
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (548 KB)

    Large telecommunication systems are assembled from independently operating sub-units and no two systems are identical. Each sub-unit has its own characteristic emission signature; these sub-units are coupled together with a multitude of differing cable types (screened and unscreened), and the whole system has an emission characteristic occupying a very wide frequency spectrum. Limitations within e... View full abstract»

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  • Seventh International Conference on Electromagnetic Compatibility (Conf. Publ. No.326)

    Publication Year: 1990
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (52 KB)

    The following topics were dealt with: electromagnetic compatibility; standards; regulations; telecommunication cables; EMI screening; circuit EMC and design; shielding materials; EMC measurement and testing; enclosures; radiated emission modelling; field tests; aircraft RFI; immunity testing; EMC education; case studies; marine EMC; EMP lightning View full abstract»

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  • Instrumentation configurations for the performance of EMP test procedures

    Publication Year: 1990, Page(s):301 - 307
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (536 KB)

    The authors briefly review the details associated with EMP hardness test procedures in MIL-STD-188-125 (draft) and MIL-STD-461C/462. These tests are important to nuclear weapon effects engineers because they simulate the stress of an electromagnetic pulse which a military electronics system will experience. Included are details of the equipment configurations for the tests, a discussion of the are... View full abstract»

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  • EMP ship trial, planning, execution and result

    Publication Year: 1990, Page(s):308 - 317
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (368 KB)

    Electronic equipment fitted in naval vessels is extremely vulnerable to the effects of an electromagnetic pulse (EMP). The authors discuss briefly the theory of the generation of EMP, ship platform hardening techniques, conducting a ship EMP audit prior to an EMP trial, conducting an EMP ship trial, results obtained and concluding with the making of recommendations on how improvements can be made ... View full abstract»

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  • A university postgraduate course in EMC

    Publication Year: 1990, Page(s):240 - 242
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (184 KB)

    In preparation for the forthcoming EC legislation, UK electronics and electrical industries and industries whose products incorporate electrical or electronic elements will need a much higher level of expertise in electromagnetic compatibility than is currently available. The main objective of the MSc course described is to produce engineers whose knowledge of EMC will enable them to make importan... View full abstract»

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  • Technical rationale behind the proposed ANSI electrostatic discharge standard

    Publication Year: 1990, Page(s):10 - 15
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (384 KB)

    The American National Standards Institute (ANSI) is creating an ESD standard which provides guidance on electrostatic discharge testing procedures for electronic equipment using air discharge and contact discharge methodologies. The ANSI document contains material that has been ignored by other ESD standards and the authors who are ANSI committee members describe the issues which they feel should ... View full abstract»

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  • Screening performances of triaxial cables with optimum braided shields

    Publication Year: 1990, Page(s):24 - 29
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (264 KB)

    The author investigates the shielding effectiveness of triaxial cables employing optimum designs for braids in their inner and outer shields. This is done by calculating the time and frequency domain responses of inner-most line to the fields induced on the shield of the outer line. For most optimised braids, transfer admittance is in the same order of transfer impedance and thus both of these par... View full abstract»

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  • An equivalent circuit model for arbitrarily-shaped metallisation areas on printed circuit boards

    Publication Year: 1990, Page(s):42 - 49
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (376 KB)

    The author describes an equivalent circuit model which has been developed to predict the electrical behaviour of large or irregularly shaped areas of metallisation on printed circuit boards. An understanding of the behaviour of such areas can be vital in achieving successful implementation of RF circuit designs. The underlying theory for the model is described briefly, and steps taken to ensure th... View full abstract»

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  • Effective lightning protection

    Publication Year: 1990, Page(s):287 - 293
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (272 KB)

    The author presents the lightning protection problems both in general terms and as a technical evaluation. He shows the importance of both the requirements of the protection units and their placing in a typical installation. A thorough understanding of lightning protection requirements is developed, removing the misconceptions that currently exist within the electrical industry regarding protectio... View full abstract»

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