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The following topics were dealt with: EMC management; man-made noise; ultrawideband EMC; EMC measurements; EM interference control; spectrum management; spectrum measurement; high power electromagnetics; computational electromagnetics; reverberation chambers; signal integrity; electromagnetic product safety; and electromagnetic solvers
European industry is becoming more outspoken on the need for improving market surveillance and, in some cases, industry has refused to accept higher product standards if market surveillance is not drastically improved (L. Ettarp and H. Lund, 2000). This paper examines a model for a well run safety and EMC market surveillance plan. Some key issues, which come up with regard to the new model, are also...
The use of technologically advanced lighting is increasing with the demand for better energy efficiency. Unfortunately, technological developments in the lighting industry are also increasing the incidence of interference from lighting appliances. This paper examines lighting interferences and compares them with EMC requirements and test results from electrical lighting and similar equipment Also,...
A required junior-level course on electromagnetic compatibility and signal integrity has been added to our computer engineering curriculum. The goal of the course is to prepare our students for further study in high-speed design and to provide them with a competitive advantage in the marketplace. The course is, of necessity, a compromise between coverage of electromagnetics theory and the breadth...
Since the advent of motor vehicles, spark ignited internal combustion engines have been used. While the technology involved has changed significantly since the advent, the end goal is to ignite the fuel in the combustion chamber to produce power. This paper examines various ignition systems, their electromagnetic noise characteristic and reception performance as it pertains to these ignition systems
A procedure is presented to simulate the complete automobile radio system, from antenna to speaker. The method involves generating reduced order models of all relevant components and interactions, which are then linked together in a time-domain system solver. To illustrate the usefulness of this simulation capability in vehicle-level system design a novel algorithm for automated computer rating of...
A diode detector consisting of a zero-bias Schottky diode connected to an electrically short dipole is a configuration commonly encountered in electric field measurement applications, e.g. wideband electric field probes. This circuit is described analytically by nonlinear differential equations, due to a nonlinear diode resistance. This problem is solved here using a novel linear-nonlinear analytical...
New analytical expressions are proposed for the prediction of the frequency dependence of the characteristic odd-mode impedance of differential interconnects. The classical microwave definition is reviewed as well as analytical formulations available in literature. A two dimensional finite difference frequency domain method is applied to compare the results and check the accuracy of the proposed expressions
Clock signal paths are often routed near other signal strips over a ground plane. These situations generate configurations of strips involving coupled microstrip sections interacting with non coupled microstrip sections, and generating transitions between coupled and uncoupled microstrip sections that heavily modify the propagations of both clock and information signals. These transitions usually...
Aim of this paper is the validation in both frequency and time domain of the procedure to extract fully H-Spice compatible equivalent circuits of structures on printed circuit boards. The procedure is initiated by standard measurement of scattering parameters between 40 MHz to 20 GH. After the extraction of the equivalent circuit, the computed scattering parameters are compared with those measured...
The performances of a twisted wire pairs (TWP) cable above ground are analysed in order to predict the internal propagation. To take into account the nonuniformity produced by the twists, the TWP line is discretized into sections of parallel wire transmission line (TL) whose different electrical parameters are derived analysing the different TWP cross-sections by the finite element method (FEM). The...
In this paper, the failures which are induced by radio-frequency interference (RFI) in switched capacitor (SC) circuits are investigated and the key role which is played by the distortion of MOS switches in the on state is highlighted. Such a distortion mechanism is analyzed in detail and a new simple analytical model which enables one to predict RFI-induced errors in SC circuits is proposed. The...
The possible effects of spread-spectrum-clock interference on wideband radiocommunication services have been investigated in relation to the interference that would be caused by unmodulated clock signals. The study includes radio systems like digital video broadcast terrestrial (DVB-T) and wideband CDMA (W-CDMA) mobile radiocommunication. The results of the investigation show that the increase of...
This paper describes the temperature distribution analysis of lambda/4 type EM-absorber using resistive film when high electric power is injected to the absorber. For the temperature analysis, FDTD method is used to analyze electromagnetics and SIMPLE (semi-implicit method for pressure linked equations) method is used for calculation of heat transport and air convection enabling to analyze local heat...
A large absorption of the electromagnetic wave achieves using periodically layered materials with low loss. Our FDTD calculation demonstrates the sharp absorption at discrete frequencies for TM and TE polarizations. These frequencies are called absorbing peak frequencies, which are determined by the characteristic equations related to the transversal resonance in the cross section of the composite...
The paper presents a study of the coupling between an external field and a metallic enclosure with a long aperture in the frequency range which includes several box resonances. A reverberation chamber is considered as a field generation structure. A customized FDTD code is used to calculate the current induced by the external field in a loop placed inside the enclosure. In order to simulate the reverberation...
Finite difference time domain (FDTD) methods were employed to develop the complete mechanical structure (complex) of the half-wavelength experimental dipole models used to conduct this research. This paper examines how the phantom shell dielectric boundary affects the specific absorption rate (SAR) for simulations based on experimental system validation measurement protocols and the resultant calculations...
On July 10th 2003 the Federal Communication Commission adopted changes to Part 68(a) of the Commissions rules governing hearing aid compatible telephones in Report and Order 01-309. Specifically this R&O addressed wireless handsets. The main thrust of the action was to address exemption of HAC requirements for digital wireless phones that had been in place since 1988 hearing aid compatibility...
Measuring loop antennas used in the frequency band below 30 MHz have been generally calibrated with the standard field method, where a standard loop antenna generates a well-defined magnetic field at an antenna under calibration. However, it is very difficult to evaluate the strength of the generated field with great accuracy. To cope with this problem, the present paper newly develops a calculable...
This study proposed a modified phase center and pattern matching (PCPM) method to reduce antenna factor (AF) variations of Bilog between different geometries of standard site method (SSM). For frequencies below 300 MHz, mutual coupling may have an effect on the results of original PCPM, thereby enlarging AF variations of Bilog. Therefore, a modified PCPM was applied with the results showing that AF...
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