Sébastien Lalléchère

Safran (France)

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Blaise Ravelo

Nanjing University of Information Science and Technology

Pierre Bonnet

Centre National de la Recherche Scientifique

Fayu Wan

Nanjing University of Information Science and Technology

Dragan Poljak

University of Split

Khalil El Khamlichi Drissi

Institut Pascal

Françoise Paladian

Institut Pascal

Wenceslas Rahajandraibe

Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

Stéphane Girard

Centre Inria de l'Université Grenoble Alpes

AŠ

Anna Šušnjara

University of Split

SŠ

S. Šesnić

University of Split

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Clermont Auvergne

Institut Pascal

Clermont Université

Nanjing University of Information Science and Technology

University of Split

Universidad Blas Pascal

Sigma Clermont

Safran (France)

Université de Bourgogne

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Exploring order reduction clustering methods for uncertainty quantification of electromagnetic composite structures

Institution of Engineering and Technology eBooks (2021)

Sébastien Lalléchère

Chapter Contents: 9.1 Introduction 9.2 Statement of the problem 9.2.1 Random composition of composite 9.2.2 Uncertainty propagation: MC as golden standard and optimal sampling using SROM 9.3 Assessing stochastic shielding properties with MC and SROM 9.3.1 PoC descriptions (test cases) 9.3.2 Test case #1: EM attenuation through semi-infinite composite material with normal incidence plane wave 9.3.3 Test case #2: Composite material SE via full-wave time domain models 9.4 Conclusion References

10.1049/sbew552e_ch9

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Stochastic Dosimetry Applied to Transcranial Magnetic Stimulation Analysis

Mario Cvetković Anna Šušnjara Dragan Poljak Sébastien Lalléchère Khalil El Khamlichi Drissi

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Kron‐Branin modeling of symmetric star tree interconnect

International Journal of Circuit Theory and Applications (2018)

Zhifei Xu Blaise Ravelo Olivier Maurice Sébastien Lalléchère Fayu Wan

Summary An analytical modeling method of symmetric tree interconnect is developed in this paper. The tree topology is composed of multibranch distributed interconnects of printed circuit board (PCB). The interconnects are constituted by elementary transmission line (TL) defined by its characteristic impedance and propagation constant. The star symmetric tree model is built with the Kron‐Branin (KB) formalism elaborated with the graph topology. Reduction method allowing to simplify the graph from single‐input multiple‐output (SIMO) to single‐input single‐output (SISO) circuit is used. The interconnect tree branch currents are determined from the reduced SISO structure. The symmetric tree S‐parameter and access and transfer impedance models are expressed in function of constituting elementary TL parameters with the KB formalism. The particular behaviors of short‐circuit and open‐ended star tree are investigated versus the tree number of output branches. The developed KB model effectiveness is validated with microstrip star tree designed and simulated with a 3D electromagnetic computational and electronic circuit designer commercial tool. Three different proofs of concept (POC) of star trees comprised of three‐output, four‐output, and five‐output branches are computed. The simulated reflection and transmission coefficients from DC to 5 GHz are in good agreement with the KB models. The proposed model is potentially useful for the PCB complex interconnect modeling and signal integrity analysis.

Star (game theory)

Star network

Tree (set theory)

Formalism (music)

Tree network

10.1002/cta.2575

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Parametric Geometrical Study of OOO-Microstrip Circuit with Dual-Band Bandpass NGD Behavior

Radioengineering (2021)

Ru‐Yuan Yang Fayu Wan Jamel Nebhen Sébastien Lalléchère Blaise Ravelo

This paper introduces a bandpass (BP) NGD circuit design engineering.The developed circuit is designed and implemented using distributed microstrip technology and operates with outstanding dual-band bandpass NGD performance added with low attenuation.The BP NGD topology presents an innovative geometrical shape represented by an OOO (triple O) structure composed of multi-parameter parallel transmission lines (TLs) based elements.The OOO type NGD circuit is mainly composed of different physical length TLs and two identical coupled lines (CLs).Then extensive parameter NGD analyses are elaborated to investigate on the influences of each physical size of OOO circuit on the NGD performances.Through the difference of physical length of transmission line, the delay can be adjusted.Through the results of simulation and measurement, it can be seen that the center frequency points are about 0.75 GHz and 1.46 GHz respectively, and the time delay is about -1.83 ns and -2.6 ns respectively.

Center frequency

10.13164/re.2021.0304

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Citations (13)

FDTD/FVTD Methods and Hybrid Schemes Applied to Reverberation Chambers Studies

ESASP (2006)

Sébastien Lalléchère Stéphane Girard R. Vernet

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Stochastic post-processing of the deterministic boundary element modelling of the transient electric field from GPR dipole antenna propagating through lower half-space

International Journal of Computational Methods and Experimental Measurements (2017)

Dragan Poljak S. Šesnić Sébastien Lalléchère Khalil El Khamlichi Drissi

The paper deals with time domain-deterministic stochastic assessment of a transient electric field generated by a ground penetrating radar (GPR) dipole antenna and transmitted into a lower half-space.The deterministic time domain formulation is based on the space-time Hallen integral equation for half-space problems.The Hallen equation is solved via the Galerkin-Bubnov variant of the Indirect Boundary Element Method (GB-IBEM) and the space-time current distribution along the dipole antenna is obtained, thus providing the field calculation.The field transmitted into the lower medium is obtained by solving the corresponding field integrals.As GPR systems are subjected to a rather complex environment, some input parameters, for example the antenna height over ground or earth properties, are partly or entirely unknown and, therefore, a simple stochastic collocation (SC) method is used to properly access relevant statistics about GPR time responses.The SC approach also aids in the assessment of corresponding confidence intervals from the set of obtained numerical results.The expansion of statistical output in terms of mean and variance over a polynomial basis, via the SC method, is shown to be a robust and efficient approach providing a satisfactory convergence rate.

Transient (computer programming)

Ground-Penetrating Radar

10.2495/cmem-v5-n5-678-685

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Citations (1)

Quantifying Uncertainties Strength from Electromagnetic Stochastic Simulations

Springer eBooks (2013)

Basile Jannet Pierre Bonnet Sébastien Lalléchère B. Pecqueux

10.1007/978-1-4614-9500-0_1

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On the investigation of contactless bandpass NGD control with microstrip patch-based circuit

Journal of Electromagnetic Waves and Applications (2020)

Lili Wu Fayu Wan Wenceslas Rahajandraibe Sébastien Lalléchère Blaise Ravelo

This paper presents an investigation on innovative bandpass negative group delay (NGD) control. The bandpass NGD theory is elaborated with patch antenna-based circuit input impedance. The S-matrix and group delay (GD) models are expressed in function of the circuit geometrical parameters. To validate the no-contact electromagnetic coupling bandpass NGD control, proof of concept is designed, fabricated and tested. The bandpass NGD behavior is in good agreement between theoretical model, EM full wave simulation and measurement, which shows NGD center frequency, 2.2 GHz, value, −0.67 ns and insertion loss, −2.93 dB, and reflection loss, −11.39 dB. It is also demonstrated that the NGD parameters vary in function of the metallic sheet-patch distance increased progressively from 0 to 26 cm.

Center frequency

10.1080/09205071.2020.1791740

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Electromagnetic Characterization of Nanomaterials: Preliminary Study of 60 GHz Millimetre Wave Li-NGD Circuit in Microstrip Technology

Fayu Wan Xiaoyu Huang Samuel Ngoho Kishore Ajay Kumar Ayyala Preeti Thakur

This book chapter describes a circuit investigation on millimetre wave negative group delay (NGD) function. The main specifications of unfamiliar bandpass (BP) NGD function are defined. The topological description of the li-topology to be exploited in the chapter is developed. The design method of millimetre wave NGD li-circuit is described. Proof of concept (PoC) of microstrip circuits designed on alumina dielectric substrate is introduced. Then, simulations with commercial tool which are presented to highlight the design feasibility of 60 GHz NGD centre frequency PoC are discussed. Then, parametric study with respect to the physical and geometrical parameters of li-circuit on the BP-NGD performance as NGD value, NGD centre frequency and NGD bandwidth is proposed.

Millimetre wave

10.1007/978-981-16-6819-7_12

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On some applications of stochastic collocation method in computational electromagnetics: Applications in ground penetrating radar, bioelectromagnetics, grounding systems and buried lines

Dragan Poljak S. Šesnić MARIO CVETKOVIĆ Sébastien Lalléchère Khalil El Khamlichi Drissi

The paper reviews the use of deterministic-stochastic models some areas of computational electromagnetics where there is an uncertainty in the input data set, i.e. where some properties of a system are partly or entirely unknown. In such problems a simple stochastic collocation (SC) method is used to properly assess relevant statistics about given responses. The SC approach also provides the assessment of corresponding confidence intervals in the set of obtained numerical results. The expansion of statistical output in terms of mean and variance over a polynomial basis, via SC method, is shown to be robust and efficient approach providing a satisfactory convergence rate. Some illustrative computational examples featuring the specific applications in ground penetrating radar (GPR), human exposure to electromagnetic fields, buried lines and grounding systems are also given in the paper.

Collocation (remote sensing)

Ground-Penetrating Radar

Bioelectromagnetics

Electromagnetics

Polynomial Chaos

10.1109/softcom.2016.7772167

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Citations (6)