Nicolas Chavannes

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This paper presents preliminary evaluation of the hybrid parallelization of the Finite-Difference Time-Domain (FDTD) method based on Open Computing Language (OpenCL) and the Message Passing Interface (MPI). Due to the portability of OpenCL, developed code targets not only distributed shared memory computer clusters based on multi-core central processing(More)
In this paper, we describe a specifically designed patch antenna that can be used as the basis antenna element of a clinical phased-array head and neck hyperthermia applicator. Using electromagnetic simulations we optimized the dimensions of a probe-fed patch antenna design for operation at 433 MHz. By several optimization steps we could converge to a(More)
In this paper we evaluate the usability and performance of Open Computing Language (OpenCL) targeted for implementation of the Finite-Difference Time-Domain (FDTD) method. The simulation speed was compared to implementations based on alternative techniques of parallel processor programming. Moreover, the portability of OpenCL FDTD code between modern(More)
1. Introduction Simulations have become an integral part of a product design workflow, as devices are becoming more complex and development cycles are shrinking to be more competitive and meet market demand. In the last two decades, the capabilities of electromagnetic simulation techniques have vastly expanded to simulate increasingly more realistic and(More)
The absorption of electromagnetic fields in the hand is investigated over the 900-3700-MHz frequency range. This enables the determination of the envelope of the peak spatial specific absorption rate in the hand. It also provides a basis for deriving measurement procedures for evaluating compliance of wireless devices with specific absorption rate limits in(More)
A complete framework to model linear (Drude, Debye, Lorentz) and nonlinear (Kerr, Raman) dispersion effects with the finite-difference time-domain (FDTD) method in electromagnetics (EM) has been developed. Subcell smoothing for all material effects has been developed and implemented. The challenges that this poses to FDTD such as stability conditions that(More)
A novel method is proposed to treat thin conductive (TC) sheets of arbitrary three-dimensional shape and curvature with the electromagnetic (EM) finite-difference time-domain (FDTD) algorithm without the need to resolve the sheet thickness spatially. It is shown that due their physical properties. TC sheets can be modeled without introducing additional(More)
This article demonstrates the capability of using the finite-differences time-domain (FDTD) method as simulation tool for optimizing the design of an antenna. The FDTD simulation method is locally enhanced with subcell modeling technique, which incorporates a-priori known field behavior in (1) curved material interfaces and (2) strong field gradients near(More)
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