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This paper deals with the numerical evaluation of the magnetic field produced by a wireless power transfer (WPT) system in an electrical vehicle (EV) made by carbon-fiber (CF) laminates that are modeled as homogeneous anisotropic layers. The numerically calculated magnetic field generated by a 7.7 kW WPT system operating at 85 kHz has been compared with the reference levels of the ICNIRP guidelines...
In this article, a surface mounted device (SMD) common-mode choke (CMC) required for unshielded-twisted-pair automotive communication systems (like 100Base-T1) is characterized in detail regarding its high-frequency filtering characteristics. Firstly, the S-parameters and mixed-mode S-parameters of the mentioned choke were measured using a 4-port vector network analyzer in a frequency range of 1 MHz...
In power electronics applications, high frequency models for cables are necessary to understand EMI issues in pulsewidth modulation drives. This paper shows the approach developed at the French Institute of Technology (IRT) Saint-Exupery, in order to take account of the frequency dependency of unshielded power cables per-unit-length parameters for EMC simulations. Fast, predictive models are compared...
An original ElectroMagnetic simulation methodology based on the hybridization of deterministic and statistical models is proposed to study wireless signal propagation inside a train. The coupling between the EM methods is performed with the Kron's networks formalism to significantly optimize the compromise between simulations accuracy and computation resources. The proposed hybrid model offers promising...
One important objective of the electromagnetic compatibility (EMC) studies is to make the products compliant with the EMC requirement of the customers or the standards. However, all the EMC compliance verifications are applied before the delivery of final products. Will the product still be EMC compliant during the lifetime? If not, what is the risk of non-compliance with EMC requirements, and how...
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...
This paper proposes the methods of high intensity radiated field (HIRF) testing for civil aircraft. It introduces how to eliminate the background noise and select the frequency list for HIRF testing at first. Then, the method of LLSC calibration and LLSC test is proposed along with an automatic test system of LLSC testing. After that, how to design a mode stirrer and validate the performances of it...
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...
At mass coverage of populous urban areas by wireless communications services the microcellular structure of cellular radio networks and tendency of further reduction of its sites are occur. However, the widely used empirical radio wave propagation models (Okumura-Hata, COST231-Hata, COST231-Walfish-Ikegami, Lee, etc.), as a rule, are defined for propagation on distances between mobile and base stations...
The electrical behavior of a cavity with arbitrary shape, lossy walls and lossy filling material, which is excited by electrically small current elements, is represented by a novel broadband Foster-type circuit based on the eigenmodes of the cavity. This model is inherently stable in the time domain and allows the simulation of arbitrary nonlinear loads with a commercial circuit simulator. The convergence...
A new adaptive terahertz absorbing screen providing a reflection coefficient lower than −10 dB in the frequency range 0.6–2.2 THz and with total thickness around 70 μm is proposed. The designed Salisbury screen, backed by a perfect electric conducting plate, consists of a first graphene layer as lossy sheet and two spacers made of polyethylene terephthalate (PET), separated by a tunable graphene/SiO2...
This paper presents an accurate and efficient time-domain approach for analyzing the coupling of transient electromagnetic fields into cable systems with arbitrary linear networks at terminations. Some nonlinear elements in termination circuits are also considered. The approach is based on hybridization of three different methods. First, the discontinuous Galerkin time domain (DGTD) method is used...
This work demonstrates in a theoretical manner how to free certain bandwidths for low frequency communication systems, in an electromagnetically polluted environment by canceling spectral lines of a present disturbance signal. In many cases electromagnetic interference (EMI) is system-intrinsic and the designers have influence on some of its parameters. In case of a combination of switched mode power...
We present EMI simulations of a silicon carbide MOSFET traction inverter. The simulations are based on a transient circuit simulation and frequency domain simulations of different 3D geometry models. In a first step, an equivalent circuit is derived from parts of the geometry model and combined with an analytical model of the MOSFETs and an equivalent circuit model of the DC link capacitor. The results...
This paper presents a metamodel based on the sparse polynomial chaos approach, well adapted to high-dimensional uncertainty quantification problems, applied for the analysis of crosstalk in printed circuit board microstrip traces. It enables to estimate, with a low computational cost compared to Monte Carlo (MC) simulation, statistical quantities and provides a sensitivity analysis of the crosstalk...
The purpose of this work is to establish a numerical framework capable of generating simulation data with the same statistical properties as the represented electrical reverberation chamber (ERC). While an ERC whose resonating volume is geometrically varied produces randomly distributed fields, a numerical simulation is a deterministic system. However, the statistical distributions of electrical fields...
In the first part of this paper the results of measurements on the shields of signaling cables are presented. This meant measuring the shield's inner and outer surface impedances in the function of frequency and current as well. These impedances used to define the inner screening factor, which describes the effectiveness of the screening on given frequency, or on given current. The second part of...
Modelling of complex wave sources is an important topic in several scientific and engineering communities. In the context of electromagnetic compatibility, the complexity of field emissions from extended and broadband planar sources allows for the use of statistical methods to characterise the development of far field interferences from near field scanning at planes parallel to the source. We review...
In this study, RLCG method is used to estimate a low voltage transmission line for twisted overhead and underground low voltage distribution cables. This model is applied for cables with different types, different sections and lengths taking account the capacitive and the inductive coupling. SPICE determination of transmission characteristics and cables crosstalk are validated throughout physical...
This paper presents an original wide-band method (from 1 MHz to 1 GHz in the paper) for the electromagnetic (EM) characterization of a Ni-Zn ferrite tile. The method requires the S-parameter measurements of a TEM structure (a stripline cell in this paper) without and with the sample under test (SUT). In parallel, the experiment is faithfully reproduced by simulation through the FDTD method for both...
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