The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
It is well known that wideband electromagnetic noise is caused by ESD (electro-static discharge) events. Especially, the micro gap ESD of less than 1 kV produces the impulsive electromagnetic noise up to GHz bandwidth. The ESD noise is menace to cause malfunction of high-tech electrical equipment and systems. Then, the impulsive electromagnetic noise caused by the ESD was examined to clear the radiation...
This paper presents a calibration method allowing to quantify the quality of the electromagnetic field generated in a reverberation chamber. The method requires only to measure the reflection coefficient of an antenna (i.e. S11) for different stirring conditions (i.e. different positions of a mode stirrer for a mechanically stirred chamber). The proposed method requiring a simple measurement setup...
Undesired EM radiation generated by wired systems using a PLC transmission, for example, can be a source of EM pollution and bring an annoying problem of electromagnetic compatibility. The evaluation of these near-field radiation is therefore of interest. In this paper, we propose a simplified approach of electromagnetic fields in order to adequately estimate the EM radiation emitted by the wired...
This paper presents an analytical method to determine the electric field inside an enclosure with an aperture from a thin wire as an efficient source outside the enclosure. In this regard, the wire is divided into multiple segments as discrete plane wave (far-field) sources. These sources radiate and excite the enclosure through the aperture which can be modeled by Robinson's formulation. Finally...
During operation of high-voltage direct current (HVDC) power cables heat is generated in the inner conductor and the insulation. As a result, a thermal breakdown may occur if more heat is generated than can be dissipated. The electric field stress due to space charges accumulating in the insulations superimposes the geometric electric field due to the applied voltage in the cable. In this work, the...
The level of electromagnetic radiation (EMR) exposure increases day by day as natural consequences of technological developments. In recent years, the increasing use of cellular systems has made it necessary to measure and evaluate EMR originating from base stations. In this study, broadband and band selective electric field strength (E) measurements were taken at four different times in order to...
Technological improvements and dense use of wireless systems has led to an increase in exposed electromagnetic radiation (EMR) levels in recent years. The effects of these EMRs on the population have not been completely characterized despite intense research on this topic. For this reason accurate evaluation of EMR levels in the environment have become essential. Therefore, this study aims to determine...
This study deals with the polarization and depolarization currents of linear/nonlinear double-layered composites, and sets out to explore interface polarization and depolarization characteristics. The linear layer is pure low density polyethylene (LDPE) matrix. The nonlinear barrier layer is prepared by adding nanofillers (ZnO and SiC) to LDPE with different concentrations. Experimental results show...
A gel is used as the encapsulant of a power device. But there are a lot of uncertain points about the electrical properties of the gel. We have investigated the time series measurement of electric field distributions in propylene carbonate that was a dielectric liquid with large Kerr constant. The propylene carbonate dissolves polymethyl methacrylate resin and becomes gelatinous. It was considered...
We report a unique highly-linear, low-complexity, selectable slope, optical electric field frequency discriminator (FD) filter as novel phase-modulated/frequency-modulated-tointensity- modulated (PM/FM-to-IM) converter. We refer to this FD as Sin-Sin2 FD filter. Here, we review its different aspects, including its (i) surprisingly simple device design, (ii) excellent linearity performance, and (iii)...
The risk of malfunction of cardiac implant due to the influence of external electromagnetic field has been highlighted by the 2013/35/EU European Directive, which classified implanted workers as workers at particular risk. We propose in this study a new method to test in vitro cardiac implants with an electric field of 50 Hz. The exposure system was designed using numerical simulations and does not...
A telecommunication equipment and information technical equipment usually produce unintentional electromagnetic fields. Information from a video display unit could be reconstructed by intercepting such emissions at a distance. The testing methods and countermeasure methods have been discussed and those standardizations have been published at ITU-T SG5 WP2, and ITU-T K.115: Mitigation methods against...
The nature of the Power Line Communication (PLC) equipment is complex because it is considered as an information equipment for Electro-Magnetic Compatibility (EMC) standardization, but it is used to inject High-Frequency (HF) and Very High Frequency (VHF) frequency signals on the existing power network which is not designed to guide these frequencies. This PLC system issue leads to some difficulty...
This paper presents a simulation methodology for efficient investigation of human exposure to low-frequency (1 Hz to 10 MHz) electromagnetic fields generated by automotive electrical systems such as wireless power transfer (WPT) systems. The main stages of the modeling process are discussed. A simulation approach based on the combination of computationally efficient methods such as surface integral...
The novel volume integral equation (VIE) method was developed for an accurate analysis of low frequency (LF) electromagnetic (EM) fields induced inside human body voxel model. To improve stability of LF solutions, we introduced two sets of unknowns: electric voluminous currents and surface charges defined on interfaces between different materials. At low frequencies, an efficient version of VIE was...
Now designers of acoustic sensors pay special attention on piezoelectric resonators with lateral electric field. The advantage of such resonators is the fact that their parameters depend on the change in mechanical and electrical properties of object under study. For example, one can develop the gas sensor by placing near free side of resonator the film, properties of which are changed due to presence...
This paper presents the main results of a thesis work dedicated to the Specific Absorption Rate (SAR) risks in High-Frequency (HF), Very High-Frequency (VHF) and Ultra High-Frequency (UHF) frequency bands. The main goal of this thesis is to enhance SAR method validation of radio military exposure near high power antennas. It will permit to reduce cost and delay of SAR validation and quantify the actual...
CMUT efficiency depends on a high electric field over a thin vacuum gap and a dielectric isolation layer. Ideally this high electric field should only exist over the vibrating membrane of the CMUT, but electrical connections between the membranes usually pass over thin dielectric isolation layers (Fig. 1). The resulting high fields on the isolation layer cause charging, dielectric breakdown and reduces...
In numerical electromagnetic simulations of nondestructive testing methods, single and multilayer CAD models of woven glass and carbon fiber composites are analyzed to find intentionally introduced material defects. The models are excited by plane waves up to frequencies of 650 GHz (submillimeter wavelength) and by Gaussian pulses of 5 ps duration. The transmitted and reflected electric field patterns...
For electromagnetic interaction analysis in power electronics, the study and the design of Near-Field integrated magnetic antennas are presented. An antenna model is developed and compared to experimental data. The modeling and the performances of the prototype is discussed in function of the source position and the antenna design.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.