ISSN:0894-3370    

DOI:10.1002/jnm.1660040302

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractThe transmission‐line modelling (TLM) method is applied to problems in electromagnetic compatibility (EMC). Simulated results for a field‐to‐wire coupling problem are presented, together with comparisons with experimental results. The comparisons confirm the validity of the model and its accuracy. The effects on resonances and field profiles, of placing a measurement dipole antenna inside a screened room are investigated. The resonant structure inside an unlined screened room and the same room when lined with radiation‐absorbing material are investigated using a TLM model. The results confirm that the model developed can be used for the characterization of the entire EMC test envi

ISSN:0894-3370    

DOI:10.1002/jnm.1660040303

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractTwo computer programs DOTIG1 and DOTIG2 were developed to calculate, in the time‐domain, the interaction of transient electromagnetic pulses (EMP) with perfect electric conductor structures modelled by thin wires (DOTIG1) or patches (DOTIG2). DOTIG1 uses the electric field integral equation and DOTIG2 the magnetic field integral equation. Briefly described below are the numerical procedures used to develop both programs and some results that show their characteristic

ISSN:0894-3370    

DOI:10.1002/jnm.1660040304

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractCalculation of the electromagnetic field diffracted by an aperture situated in a perfectly conducting ground plane can be made through the well‐known theory of polarizabilities. However, simple expressions are only obtained under conditions which are not often fulfilled in electromagnetic compatibility problems since, for example, the disturbing field incident on the aperture must be considered as a uniform one. Furthermore, if the aperture is loaded by a low conducting material, available approximate formulas are only valid for a small circular hole. In this paper, we present a numerical approach based on the determination of the equivalent magnetic current distributed on the surface of the aperture. This distribution is the solution of an integral equation solved by the method of moments. This formulation allows us to take the surface impedance of a loading material and the contact resistance between this material and the rim into account. The validation of the computer code is shown by comparing computed and analytical results on some typical examples. Few applications are also describe

ISSN:0894-3370    

DOI:10.1111/j.1365-2834.1996.tb00045.x

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractKnowledge of the electromagnetic field distribution inside electronic enclosures due to incident fields is of interest to EMC design engineers. In this paper, a three‐dimensional formulation of the finite element method was developed to solve the electromagnetic field distribution inside metal enclosures with apertures. The formulation was developed using a three‐component vector magnetic potential and a scalar electric potential. The displacement current as well as the conduction current term was included. The region of interest was discretized using eight‐node isoparametric hexahedrons and the potential functions were defined using linear first‐order basis functions. The penetration of a steady‐state electromagnetic field through an aperture into a simple cavity was analysed with the 3‐D

ISSN:0894-3370    

DOI:10.1002/jnm.1660040306

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper presents a time‐domain method to calculate electromagnetic plane wave induced surges on overhead multiconductor transmission lines. By means of some particular line impulse responses, the method takes into account the distributed nature of the coupling with plane wave radiated fields. A comparison of measured plane‐wave induced voltages reported in the literature and calculated voltages shows a very close agreem

ISSN:0894-3370    

DOI:10.1002/jnm.1660040307

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractStudies on the propagation of picosecond pulses in coupled microstrip line interconnections on silicon integrated circuit substrates are presented. The effects of conductor and dielectric losses in the transmission line on the distortion, delay and attenuation of picosecond pulses are studied in detail. A direct comparison is made with the propagation characteristics of interconnects using ordinary metals and high‐temperature superconductors such as YBa2Cu3O7. The results generally show the advantages of using high‐temperature superconductor tracks on low‐loss integrated circuit substrates such as GaAs. However, even in this case, geometrical dispersion can cause distortion on the pulses and it is therefore an important factor to be consi

ISSN:0894-3370    

DOI:10.1002/jnm.1660040308

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractCross‐talk and pulse distortion in high‐speed digital circuits have long been major design considerations. With the present trend towards increased speed and packing density the commonly used TEM approximation is no longer capable of producing sufficiently accurate results. In this contribution, the finite‐difference time‐ domain technique incorporating a novel means of launching the pulses is used to provide a rigorous three‐ dimensional simulation of cross‐talk on high‐speed digital circuits. This includes the often‐neglected effects of higher‐order modes and surface waves. Results are presented for pulses propagating along a single track and for coupling between two and three tracks using square, gaussian and raised cosine pulse excitation functions. The results are shown to be in good agreement with other

ISSN:0894-3370    

DOI:10.1002/jnm.1660040309

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractThe electromagnetic radiation from electronic systems is formulated in terms of an integral equation for the electric and the equivalent magnetic current density, which is numerically solved by the method of moments. The electromagnetic coupling to conducting thin wires, thin plates, and aperture fitted cabinets is taken into account by appropriate operator equations.In order to solve the integral equation of electrically large conducting structures, suitable basis functions are needed to minimize the computation time. B‐spline functions of the second and third degree are used as a basis in the moment method, which lead to a decrease of the computation time.A second way to decrease the computation time is given by the possibility of determining which parts of the structure of a printed circuit board (PCB) have to be considered and which parts can be neglected. Examples show that the influence of near source conducting areas to the radiated emissions is strong. It will be shown that this influence depends on the geometrical symmetry, the shape, and the distance of the scattering bod

ISSN:0894-3370    

DOI:10.1002/jnm.1660040310

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper presents an annotated bibliography of numerical modelling in electromagnetic compatibility with emphasis on coupled transmission lines. Although the papers cited generally appeared in the open literature between 1980 and 1990, very useful works prior to that period are covered.

ISSN:0894-3370    

DOI:10.1002/jnm.1660040311

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY