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Affichage de 741 à 750 sur 16387

Article dans une revue

Topological Berry Antenna on a Silicon Chip for Terahertz Wireless Communication

Sonu Kumar, Ridong Jia, Yi Ji Tan, Thomas Caiwei Tan, Pascal Szriftgiser, G Arun Kumar, Guillaume Ducournau, Arokiaswami Alphones, Ranjan Singh

Nonzero Berry curvature is central to the existence of topological edge states in electronic and photonic valley-Hall systems. While manipulating the Berry curvature in condensed matter systems is challenging, valley-Hall topological photonics offer unprecedented control, where the broken spatial...

Advanced Photonics Research, In press, ⟨10.1002/adpr.202500123⟩. ⟨hal-05131748⟩

Article dans une revue

Low-Profile Quad-Band AMC-Backed Antenna for Gain Enhancement

Z. Mordi, Z. Hamouda, M. Lagha, Pierre Laly, Tuami Lasri

The article details the design and performance of a compact, quad-band antenna that uses an artificial magnetic conductor to significantly enhance its gain for wireless applications. Topics include the antenna's structure and operating principle, the critical role of parametric studies in...

Microwave journal, 2025, 68 (8), pp.133. ⟨hal-05495690⟩

Article dans une revue

Influence of passivation, doping and geometrical parameters on the avalanche breakdown of GaN SBDs

B. Orfao, R A Peña, B G Vasallo, S Pérez, J Mateos, T González

The breakdown of GaN-based Schottky barrier diodes associated with impact ionization events initiated by electrons injected by tunneling is physically analyzed by means of a Monte Carlo simulator self-consistently coupled with a two-dimensional solution of the Poisson equation. Simulations of a...

Journal of Computational Electronics, 2025, 24, pp.189. ⟨10.1007/s10825-025-02430-2⟩. ⟨hal-05376884⟩

Article dans une revue

Strategies to achieve efficiencies of over 19% for organic solar cells

Xingchi Xiao, Malika Chalh, Zhi Rong Loh, Esther Mbina, Tao Xu, Roger C. Hiorns, Yujia Li, Maloy Das, Kekeli N'Konou, Leonard W T Ng

Organic solar cells are a promising system for generating clean energy. Recent advancements, particularly in non-fullerene acceptors such as Y6 and its derivatives, along with the development of innovative polymer donors, have significantly enhanced the power conversion efficiency of organic solar...

Cell Reports Physical Science, 2025, 6 (1), pp.102390. ⟨10.1016/j.xcrp.2024.102390⟩. ⟨hal-04932307⟩

Article dans une revue

Using Synapse Saturation in Spiking Neural Networks for Wake Up Receivers in Internet of Things Networks

Guillaume Marthe, Claire Goursaud, Laurent Clavier

Energy consumption remains a predominant constraint in numerous Internet of Things (IoT) applications, as microcontrollers typically exhibit excessively high power consumption. To address this issue, novel circuit designs have been introduced, and the utilization of spiking neurons and analog...

IEEE Internet of Things Journal, 2025, pp.1-1. ⟨10.1109/JIOT.2025.3599668⟩. ⟨hal-05229337⟩

Communication dans un congrès

A Tensor-Based Modulation Scheme with Hybrid Optimization for Unsourced Random Access

Ala Baccar, Alexis Decurninge, Sofiane Kharbech, Rima Khouja, Eric Pierre Simon, Joumana Farah

<div><p>This paper extends the idea of tensor-based modulation (TBM) for unsourced random access by introducing a new small sub-constellation, enabling a hybrid continuous-discrete optimization approach on the tensor factors. This approach enhances the detection process and extends the...

EUSIPCO 2025, Sep 2025, Palerme (Italie), Italy. ⟨hal-05136805⟩

Article dans une revue

Drying Behavior of Flax Stems at Different Degrees of Dew Retting Under Simulated Rainfall: Implications for Smart Agriculture and Sensor Development

Ali Reda, Lionel Buchaillot, Steve Arscott

Dew retting of flax stems is a key agricultural process which facilitates fiber extraction from parent stems. If sensors are to be developed to monitor the degree of retting for optimal fiber extraction, then stem characteristics such as water uptake and loss need to be accurately known. Here, the...

Agriculture, 2025, 15 (4), pp.395. ⟨10.3390/agriculture15040395⟩. ⟨hal-04960263⟩

Communication dans un congrès

Effect of High Temperature RF Stress on the Trapping Behavior of Carbon Doped AlN/GaN/AlGaN HEMTs

Lyes Ben-Hammou, François Grandpierron, Elodie Carneiro, Katir Harrouche, Etienne Okada, Gilles Patriarche, Farid Medjdoub

This study investigates the impact of short-term hightemperature operating life (HTOL) reliability testing on the trapping behavior and power performance of carbon-doped AlN/GaN/AlGaN High Electron Mobility Transistors (HEMTs). HTOL stress can lead to significant degradation in key performance...

2025 IEEE International Reliability Physics Symposium (IRPS 2025), Mar 2025, Monterey, CA, United States. ⟨10.1109/irps48204.2025.10983377⟩. ⟨hal-05344709⟩

Communication dans un congrès

Lentille de Luneburg pour les ondes de gravité

Svetlana Kuznetsova, Matteo Mazzotti, Vinicius Fonseca Dal Poggetto, Vincent Pagneux, Miguel Onorato, Marco Miniaci

Dans cet exposé, la focalisation des ondes de surface à l'aide d'une lentille de Luneburg composée de piliers immergés de hauteur uniforme est étudiée numériquement. La conception de cette lentille repose sur la dérivation et la résolution numérique des équations 3D du potentiel de...

CFA 2025 - 17e Congrès Français d'Acoustique, Société Française d'Acoustique (SFA), Apr 2025, Paris, France. ⟨hal-05366167⟩

Communication dans un congrès

Design and fabrication of bioinspired selfsimilar and non-self-similar metamaterials

Marco Miniaci

Hierarchical structures with constituents organized across multiple length scales are commonly found in natural materials such as bones, shells, and spider silk. These materials exhibit remarkable quasi-static mechanical properties, including high specific strength, stiffness, and toughness....

CFA 2025 - 17e Congrès Français d'Acoustique, Société Française d'Acoustique (SFA), Apr 2025, Paris, France. ⟨hal-05366170⟩