Results 71 to 80 of about 639,513 (288)

Ka-Band metalens antenna empowered by physics-assisted particle swarm optimization (PA-PSO) algorithm

Opto-Electronic Science
Design of multiple-feed lens antennas requires multivariate and multi-objective optimization processes, which can be accelerated by PSO algorithms. However, the PSO algorithm often fails to achieve optimal results with limited computation resources since
Shibin Jiang, Wenjun Deng, Zhanshan Wang, Xinbin Cheng, Din Ping Tsai, Yuzhi Shi, Weiming Zhu   +6 more
doaj   +1 more source

Slim Luneburg lens for antenna applications

Optics Express, 2011
Luneburg lens is a marvellous optical lens but is extremely difficult to be applied in any practical antenna system due to its large spherical shape. In this paper, we propose a transformation that reduces the profile of the original Luneburg lens without affecting its unique properties.
Angela, Demetriadou, Yang, Hao
openaire   +2 more sources

Pressure‐Assisted Dimensional Transformation of 2D Hydrogenated Borophene into 0D Boron Quantum Dots

Advanced Functional Materials, EarlyView.
Hydrogenated borophene (HB) is transformed into distinct boron nanostructures through a solvent‐free thermal process. Under flowing nitrogen, hydrogen escape promotes reconstruction into B2O3 nanoplatelets, whereas hydrogen‐induced pressure under sealed conditions facilitates fragmentation into boron quantum dots.
Ozden Gunes Yildiz, Ramin Yazdaanpanah, Yongfeng Guo, Pouriya Naziri, Sachin Kulkarni, Martina Mercurio, Maria Cristina Larciprete, Ilaria Fratoddi, Paul Simon, Wan‐Lu Li, Koray Aydin, Umut Aydemir   +11 more
wiley   +1 more source

Modal Analysis of Light Propagation, Polarization and Diffraction by Cholesteric Liquid Crystal Layers

Advanced Functional Materials, EarlyView.
The analysis of optical eigenmodes in chiral liquid crystal with perpendicular or tilted helical axis, and their correspondence with the external medium, leads to an intuitive understanding of the angle and wavelength dependency of transmissive and reflective diffraction.
Ke Xu, Pouya Nosratkhah, Le Zhou, Shengzhu Yi, Giorgio Manzoni, Kristiaan Neyts   +5 more
wiley   +1 more source

Performance Enhancement of Microstrip Patch Antenna using Metamaterial-Based Lens for 5G Applications

Pakistan Journal of Engineering & Technology
The rapid growth of 5G networks requires compact and high-performance antennas. Microstrip patch antennas (MPAs) are popular due to their low profile and light weight.
Zainab Taufeeq, Ilsa Rehman, Marwa Gul, Bilal Ur Rehman, Humayun Shahid, Kifayatullah Bangash, Sadiq Ali, Muhammad Amir   +7 more
doaj   +1 more source

Anisotropic Phonon Dynamics and Directional Transport in Actinide Van der Waals Semiconductor Uranium Triselenide

Advanced Functional Materials, EarlyView.
USe3 is introduced as an actinide van der Waals semiconductor that mirrors the quasi‐one‐dimensional physics of transition‐metal trichalcogenides. Polarization‐resolved Raman spectroscopy on exfoliated flakes maps strong in‐plane phonon anisotropy and strain‐tunable mode shifts.
Aljoscha Söll, Valentino Jadriško, Sourav Dey, Nassima Benchtaber, Kalyan Sarkar, Borna Radatović, Jan Luxa, Fedor Lipilin, Kseniia Mosina, Vojtěch Kundrát, Jakub Zalesak, Jana Vejpravová, Martin Žáček, Szymon J. Zelewski, Nikolas Antonatos, Christoph Gadermaier, José J. Baldoví, Zdeněk Sofer   +17 more
wiley   +1 more source

Comparison of fabric and embroidered dipole antennas

, 2013
Flexible antennas are an important component for wearable wireless devices of the future. A comparison between fabric and embroidered dipole antennas is performed to evaluate the suitability of different conductors as building blocks of textile antennas.
Fumeaux, I., Kaufmann, T., Fumeaux, C.
core  

Metal-Only Additive-Manufactured Geodesic Lens Antennas for the mmWave Band

This paper evaluates the suitability of additive manufacturing, with AlSi10Mg using the Laser Powder-Bed Fusion (LPBF) technique, for geodesic lens antennas.
Chen, Qiao,, Clendinning, Sarah,, Rico-Fernández, J.,, Castillo Tapia, Pilar,, Quevedo-Teruel, Oscar,   +4 more
core   +1 more source

Physical Optics Applied to Parallel-Plate Lens Antennas

IEEE Open Journal of Antennas and Propagation
The Physical Optics (PO) method is used to derive simplified expressions to compute the radiation electric fields of planar graded-index and geodesic lenses based on a parallel-plate waveguide (PPW) implementation.
Francisco Mesa, Mingzheng Chen, Pilar Castillo-Tapia, Oscar Quevedo-Teruel   +3 more
doaj   +1 more source

CO2‐to‐CO Conversion in a Gas‐Fed, Zero‐Gap, PEM Electrolyzer Enabled by Polycations and Nitrogen‐Doped Carbon‐Supported Cobalt Nanoparticles

Advanced Functional Materials, EarlyView.
A gas‐fed, zero‐gap, PEM CO2 electrolyzer is realized by incorporating PDDA+ ions onto the carbonaceous Co/N‐C electrocatalyst, with gaseous H2 and CO2 fed into the anode and cathode, respectively. Operating without an aqueous electrolyte, the system sustains a peak FECO of 65.1% at 100 mA cm−2. ABSTRACT Electrochemical carbon dioxide reduction (ECO2R)
Yuen Leong Chow, Hsi‐Wen Wu, Aimin Li, Yalou Guo, Duhong Chen, Jie Zhang, Paul A. Webley   +6 more
wiley   +1 more source