Results 131 to 140 of about 3,338 (308)

Tunable Extraordinary Optical Transmission in the Long‐Wavelength Infrared Range Using Electrostatic MEMS Actuation

Advanced Materials Technologies, EarlyView.
A MEMS‐integrated metamaterial filter enables continuous, low‐voltage spectral tuning in the long‐wavelength infrared (LWIR). The device employs extraordinary optical transmission in a dual suspended metasurface stack, where electrostatic actuation precisely controls the intermembrane air gap.
Oleg Bannik, Fedor Kovalev, Michal Zawierta, Dilusha Silva, Lorenzo Faraone, Ilya Shadrivov, Mariusz Martyniuk   +6 more
wiley   +1 more source

Rattling effect mechanism on the temperature stability of low-sintered Ca1–x(Li1/2Eu1/2)xWO4 microwave dielectric ceramics for dielectric resonant antenna applications

Journal of Materiomics
The low dielectric constant (εr < 15) is the key to improving the signal transmission speed of microwave communication devices. However, the resonant frequency temperature coefficient (τf) of most low-εr microwave dielectric ceramics is usually negative.
Qingfeng Li, Jie Li, Ying Tang, Huaicheng Xiang, Di Zhou, Kaixin Song, Liang Fang   +6 more
doaj   +1 more source

Study of broadband dielectric resonator antennas

, 2005
This article briefly reviews broadband design techniques in dielectric resonator antennas (DRAs). The attentions focus on a type of DRAs that can offer multi-resonant frequencies and these frequencies can be mergered into a broad ...
Tayeb A Denidni, Abdel R Sebak, Qinjiang Rao   +2 more
core  

Numerical analysis of Dielectric resonator antennas

, 1998
International audienceA numerical analysis of various dielectric resonator antennas (DRAs): simple (singleelement) and complex shape configurations (stacked and embedded resonators) withdifferent excitations (dipole, coaxial probe, slot‐coupled ...
Sangiovanni, A., Pichot, Christian, Dauvignac, Jean-Yves   +2 more
core   +1 more source

Coupling of Er3+ ions and Plasmonic Modes in Vertical Nanocavities for Spectral Broadening in Telecom Bands

Advanced Materials Technologies, EarlyView.
Left: Illustration of the glass & nanostructures system and the NIR emission at 1.5 µm, where the colored spheres represent the Er3+ ions within the doped glass. Right: Representation of the Stark splitting of the 4I13/2 and 4I15/2 manifolds of the Er3+, illustrating how the plasmonic modes facilitate the emission from the broader Stark manifold ...
Gaston Lozano Calderón, Víctor Anthony García Rivera, Stéphan Cagnon, Souleymane Toubou Bah, Younès Messaddeq, Euclydes Marega Junior   +5 more
wiley   +1 more source

Biodegradable Wireless Soil Urea Sensor Using Metamaterial Perfect Absorber for Distributed Deployment in Precision Agriculture

Advanced Materials Technologies, EarlyView.
In this study, we propose a biodegradable wireless soil urea sensor for precision agriculture. The sensor's electromagnetic response varies depending on the urea concentration, allowing the measurement of relative soil urea concentrations by analyzing the time‐transient electromagnetic response.
Yu Tanaami, Ken Sakabe, Tetsuya Yarimizo, Yasutaka Murakami, Tetsuo Kan, Hiroaki Onoe   +5 more
wiley   +1 more source

Superparamagnetic nano-biocomposites for application as dielectric resonator antennas

, 2017
There is a growing global interest for the development of green technologies that allow the use of products with less damage to environment, as well as for maximum and sustainable use of natural resources.
de Oliveira, Diego Lomonaco Vasconcelos, MELE, Giuseppe Agostino, Rocha da Silva, Lucas Renan, Camargo, Isabelle de Andrade, Mazzetto, Selma Elaine, Mele, Giuseppe, da Silva, Lucas Renan Rocha, Silva Agostini, Deuber Lincon da [UNESP], Rosa, Derval dos Santos, Vasconcelos de Oliveira, Diego Lomonaco, Agostini, Deuber Lincon da Silva, Andrade Camargo, Isabelle de, Almeida Fechine, Pierre Basilio, Denardin, Juliano Casagrande, Silva Agostini, Deuber Lincon da, Fechine, Pierre Basílio Almeida, Santos Rosa, Derval dos, Silva, Andre Leandro da, da Silva, André Leandro   +18 more
core   +1 more source

The Evolution of Aerosol Jet Printing, A Review: Enhancing Material Versatility and Improvements for Next‐Generation Applications

Advanced Materials Technologies, EarlyView.
Aerosol Jet Printing (AJP) has emerged as a versatile additive manufacturing technique for high‐resolution, conformal, and multi‐material printing. This review highlights advances in printable materials, substrate compatibility, post‐processing, characterization, and process innovations, while critically discussing current challenges and future ...
Chandrachur Chatterjee, Rocco Lupoi, Michael J. Gibbons   +2 more
wiley   +1 more source

The extended resonant modal theory and its applications

IET Microwaves, Antennas & Propagation
The authors extend the resonant modal theory (RMT) developed previously for a metal object to an arbitrary source region consisting of metals, dielectrics, or a combination of both.
Ruqi Xiao, Wen Geyi, Guo Yang, Wen Wu
doaj   +1 more source

Thickness‐Dependent Infrared Emissivity of Ultrathin Freestanding MoSiN Nanocomposite Membranes

Advanced Optical Materials, EarlyView.
ABSTRACT Metals and dielectrics show opposite trends in thickness‐dependent infrared emissivity: metallic films exhibit a rise in emissivity below a critical thickness, while dielectric films show a corresponding decline. For applications demanding both high emissivity and mechanical strength in membranes with nanoscale thickness, combining these ...
Reethu Sebastian, Amrid Amnache, Nadi Braidy, Luc G. Fréchette   +3 more
wiley   +1 more source