Results 31 to 40 of about 10,241 (239)

A Comparative Study and Analysis of Layered-Beam and Single-Beam Metamaterial Structures: Transmissibility Bandgap Development

open access: yesApplied Sciences, 2022
Recently, layered-beam metamaterial structures have been gaining popularity in a variety of engineering applications including energy harvesting and vibration isolation.
Winner Anigbogu, Hamzeh Bardaweel
doaj   +1 more source

Reconfigurable Photonic Metamaterials [PDF]

open access: yesNano Letters, 2011
We introduce mechanically reconfigurable photonic metamaterials (RPMs) as a flexible platform for realizing metamaterial devices with reversible and large-range tunable characteristics in the optical part of the spectrum. Here we illustrate this concept for a temperature-driven RPM exhibiting reversible relative transmission changes of up to 50%.
Ou, Jun-Yu   +3 more
openaire   +4 more sources

Actively electromagnetic modulation of IHI-shaped terahertz metamaterial with high-efficiency switching characteristic

open access: yesResults in Physics, 2019
We present terahertz (THz) metamaterial with multi-configurations, which are composed of H-shaped, II-shaped, and IHI-shaped configurations, respectively.
Xiao Zhang, Yu-Sheng Lin
doaj   +1 more source

Perfect Metamaterial Absorber [PDF]

open access: yesPhysical Review Letters, 2008
We present the design for an absorbing metamaterial element with near unity absorbance. Our structure consists of two metamaterial resonators that couple separately to electric and magnetic fields so as to absorb all incident radiation within a single unit cell layer. We fabricate, characterize, and analyze a metamaterial absorber with a slightly lower
Landy, N. I.   +4 more
openaire   +3 more sources

Metamaterial Based Circular Disc Patch Antenna Miniaturization

open access: yesAdvanced Electromagnetics, 2018
A novel metamaterial structure has been proposed for its operation at 2.4 GHz. A circular disc patch antenna resonating at dual band frequency with 2.4 GHz and 3.36 GHz has been designed using full field solver CST MWS tool and the loading effect of the ...
V. Kumar, Y. Wu
doaj   +1 more source

Highly tunable low frequency metamaterial cavity for vibration localization

open access: yesScientific Reports, 2022
Metamaterial cavity has gathered much attention recently due to its capability of localizing vibration energy. Despite the active research, however, there are still big technical challenges not solved yet.
Hong Woo Park   +4 more
doaj   +1 more source

Coding Metamaterials, Digital Metamaterials and Programming Metamaterials

open access: yes, 2014
As artificial structures, metamaterials are usually described by macroscopic effective medium parameters, which are named as "analog metamaterials". Here, we propose "digital metamaterials" in two steps. Firstly, we present "coding metamaterials" that are composed of only two kinds of unit cells with 0 and phase responses, which we name as "0" and ...
Cui, Tie Jun   +4 more
openaire   +2 more sources

Estimating number of group targets arranged in linear array via forward‐backward matrix pencil method

open access: yesIET Radar, Sonar & Navigation, 2023
An efficient number estimation method is proposed for target detection by using the forward‐backward matrix pencil method. Compared with the traditional parameter estimation methods, the proposed method can work well even for sparse signals.
Xiyuan Sun   +6 more
doaj   +1 more source

A Health Data Map-Based Ensemble of Deep Domain Adaptation Under Inhomogeneous Operating Conditions for Fault Diagnosis of a Planetary Gearbox

open access: yesIEEE Access, 2021
A deep learning model trained under a specific operating condition of the gearbox often experiences an overfitting problem, which makes it impossible to diagnose faults under different operating conditions.
Jong Moon Ha, Byeng D. Youn
doaj   +1 more source

Microwave modes of ambidextrous helices

open access: yesScientific Reports
This work presents an investigation into the electromagnetic properties of ambidextrous helices, structures composed of equal numbers of left- and right-handed turns, operating in the gigahertz frequency range.
J. Gudge-Brooke   +4 more
doaj   +1 more source

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