Results 71 to 80 of about 570,053 (282)

Efficient 3D Image Reconstruction for Near-Field Microwave Imaging Using Dynamic Metasurface Antenna

IEEE Access, 2022
In this paper, rapid reconstruction of a three-dimensional (3D) image of a scene for near-field microwave imaging using a dynamic metasurface antenna (DMA) is addressed.
A. Molaei, Vasiliki Skouroliakou, V. Fusco, O. Yurduseven   +3 more
semanticscholar   +1 more source

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Reconfigurable Intelligent Surfaces for Wireless Communications: Principles, Challenges, and Opportunities

, 2020
Recently there has been a flurry of research on the use of reconfigurable intelligent surfaces (RIS) in wireless networks to create smart radio environments.
ElMossallamy, Mohamed A., Han, Zhu, Li, Geoffrey Ye, Seddik, Karim G., Song, Lingyang, Zhang, Hongliang   +5 more
core  

Multifunctional Cascaded Metamaterials: Integrated Transmitarrays

, 2016
Control of electromagnetic waves using engineered materials is very important in a wide range of applications, therefore there is always a continuous need for new and more efficient solutions. Known natural and artificial materials and surfaces provide a
Asadchy, Viktar S., Elsakka, Amr A., Faniayeu, Ihar A., Tcvetkova, Svetlana N., Tretyakov, Sergei A.   +4 more
core   +1 more source

High Performance Metasurface Antennas

, 2020
Recently, metasurfaces (MSs) have received tremendous attention because their electromagnetic properties can be controlled at will. Generally, metasurface with hyperbolic phase distributions, namely, focusing metasurface, can be used to design high-gain antennas.
Haisheng, Hou,, Haipeng, Li,, Guangming, Wang,, Tong, Cai,, Xiangjun, Gao,, Wenlong, Guo,   +5 more
openaire   +3 more sources

Terahertz Chiral Metamaterials Enabling Broadband Polarization Conversion Using Polarization Guiding Effect

Advanced Materials Technologies, EarlyView.
A broadband terahertz polarization rotator consisting of twistingly stacked silicon–air metagratings is designed based on the polarization guiding effect and experimentally shown to achieve 90° linear polarization rotation for both TE and TM incidences.
Yun‐Seok Choi, Tae Gwan Park, Antoinette J. Taylor, Hou‐Tong Chen, Abul K. Azad   +4 more
wiley   +1 more source

A high efficiency wideband co‐polarised metalens antenna

IET Microwaves, Antennas & Propagation
The traditional co‐polarised metasurface achieves 360° phase coverage only at the resonant frequency but not full phase coverage across a wide bandwidth. This paper proposes a multilayer structure metasurface, which composes of five layers of metal patch
JiaJun Liang, Zhao Wu, Long Li, YanHu Huang   +3 more
doaj   +1 more source

AI-Assisted Metasurface Antennas Design/Optimization and Performance Enhancement Techniques: A Comprehensive Survey

IEEE Access
Metasurface optimization employing evolutionary algorithms (EAs) for forward design and machine learning (ML) for inverse design has emerged as a rapidly developing field that uses artificial intelligence (AI) to design and optimize metasurface antenna ...
Mohamed Hamza Boulaich, Said Ohamouddou, Mohammed Ali Ennasar, Abdellatif El Afia   +3 more
doaj   +1 more source

Brewster quasi bound states in the continuum in all-dielectric metasurfaces from single magnetic-dipole resonance meta-atoms

, 2019
Bound states in the continuum (BICs) are ubiquitous in many areas of physics, attracting especial interest for their ability to confine waves with infinite lifetimes.
Abujetas, Diego R., Barreda, Angela, Geffrin, Jean-Michel, Litman, Amelie, Moreno, Fernando, Saenz, Juan J., Sanchez-Gil, Jose A.   +6 more
core   +3 more sources

Mechanically pattern reconfigurable antenna using metasurface

IET Microwaves, Antennas & Propagation, 2015
A radiation pattern reconfigurable antenna designed using metasurface (MS) is proposed in this study. The pattern reconfigurable metasurfaced (PaRMS) antenna is composed of a planar semi‐circular MS placed directly atop of a planar circular patch antenna with a diameter of 70 mm (1.2 λ 0
Cheung, SW, Yuk, TIT, ZHU, H
openaire   +3 more sources