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Metamaterial - DOAJ

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Last Updated: 15 May 2022

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Hybrid machine-learning and finite-element design for flexible metamaterial wings

Despite a large variety of natural phenomena and the extreme complexity of modeling wing-air interactions, no comprehensive study of wing patterning and flight dynamics has yet to be achieved yet. Consequently, the creation of a pattern for artificially flexible wings is complicated. The resulting balance between the rigidity of metamaterial "veins" and the flexibility of the wing base was achieved by means of a low-cost fused deposition modeling 3D printer from a single commercially available thermoplastic polyurethane.

Source link: https://doi.org/10.1016/j.matdes.2022.110709


High-FOM Temperature Sensing Based on Hg-EIT-Like Liquid Metamaterial Unit

A key feature of modern Internet of Things is high-performance temperature sensing. This paper develops and experimentally investigates an Hg-EIT-like metamaterial unit block for high figure-of-merit temperature senssing applications by combining the high-quality factor component of a EIT-like metamaterial unit and the high temperature-sensitivity of liquid metals.

Source link: https://doi.org/10.3390/nano12091395


Modified Coptic Cross Shaped Split-Ring Resonator Based Negative Permittivity Metamaterial for Quad Band Satellite Applications with High Effective Medium Ratio

This research paper details the development of a modified Coptic cross-shaped split ring resonator based metamaterial with a negative permittivity and refractive index with a permeability of nearly zero. 0. 074 0. 074 0. 074, 0. 074 mm, the unit cell that was made on a FR-4 substrate with a thickness of 1. 6 mm has an electrical dimension of 0. 074 0. 074. 0. 074 0. 074 mm; the wavelength is measured at a frequency of 2. 02 GHz. Through the introduction of MATLAB code, the computer simulation technology microwave studio was used to determine the scattering parameters and their desired medium properties, i. e. , permittivity, permeability, and refractive index, which was also determined based on NRW method. To verify simulation results, the lumped component based equivalent circuit model is used. The simulation results show that the simulation result using CST and high-frequency structure simulator simulator, equivalent circuit model result using advanced design system simulator and measurement results match each other better.

Source link: https://doi.org/10.3390/ma15093389


Research on Low-Frequency Noise Control of Automobiles Based on Acoustic Metamaterial

The overall noise level in the vehicle is gradually reduced with the transition of vehicle electrification's trend. The actual vehicle test findings show that after attaching the acoustic metamaterial, the low-frequency noise levels in the front and rear of the vehicle's noise levels were reduced by 2. 0 dB and 2. 3 dB, respectively, while the interior noise quality was improved. In addition, the driver and passengers report that there is a relatively low-frequency roar in the car, and that the peak frequency is the primary reason for the low-frequency roar. The low-frequency roar is caused by the low-frequency vibration of the tailgate sheet metal, not related to the acoustic cavity mode, according to the results, which reveal that the low-frequency roar is caused by the low-frequency vibration of the tailgate sheet metal. Facing the problem of the low-frequency roar radiated into the car by the wind of the tailgate sheet metal parts, based on the local resonance band gap theory, we created a model to minimize the 35 Hz vibration of the tailgate sheet metal parts and maintain the characteristics of lightweight and miniaturization. It has been found that the structure can indeed reduce the 35 Hz noise in the car and the peak value of the tailgate sheet metal vibration by attaching the acoustic metamaterial to the tailgate and conducting CAE simulation of the entire vehicle.

Source link: https://doi.org/10.3390/ma15093261


GENERAL EQUATION FOR DIRECTED ELECTROMAGNETIC WAVE PROPAGATION IN 1D METAMATERIAL: PROJECTING OPERATOR METHOD

We investigate a boundary regime for 1D wave propagation in a metamaterial medium with simultaneously negative dielectric permittivity and magnetic permeability. We use a projecting operator approach to the Maxwell scheme in the time domain, which allows the linear propagation problem to be divided into subspaces of directed waves for the interaction of a given material with general dispersion. We also discuss and investigate singular solitary wave solutions of the system as a limitless elliptic device related to some boundary regimes.

Source link: https://doi.org/10.17466/TQ2016/20.2/B


Tunable plasmon-induced transparency with coupled L-shape graphene metamaterial

Using the coupled mode theory, the PIT effect's physical characteristics are investigated. The optical switch's performance is evaluated by various parameters, including the geometric size, Fermi level, and polarization angle. The maximum polarization extinction ratio can reach 11. 34 dB with a narrow Fermi level. With a modulation depth of 97. 3%, the highest multiple switching result is achieved, with a promising result in terahertz optical switches.

Source link: https://doi.org/10.1016/j.rinp.2022.105537


Gap coupled symmetric split ring resonator based near zero index ENG metamaterial for gain improvement of monopole antenna

Abstract exposition This paper is a summary of a symmetric split ring resonator based metamaterial that has three similarities of transmission coefficients covering S, C, and X-bands, with epsilon negative and near-zero index values. The two square rings are coupled around the split gap in the outer ring's split, while two split semicircles are also attached near the split gaps. Hence, a different set of unit cells provides a similar response to the unit cell as compared to numerical simulation conducted in CST microwave studio and verified by measurement. Circuit validation is carried out by comparing S21 obtained in ADS to the same as CST, and the equivalent circuit is built for the forthcoming MTM unit cell in Advanced Design System software, and circuit validation is achieved. A test antenna is designed to record the effect of the MTM over it.

Source link: https://doi.org/10.1038/s41598-022-11029-7


Switchable Metamaterial With Terahertz Buffering and Absorbing Performance

The slow light effect with group delay up to 3. 5 ps is achieved by introducing the electromagnetically induced transparency behavior based on simple strip pairs. When vanadium dioxide is present in the insulator state, the remarkable delay can be observed as the incident pulse propagates through the designed structure. 1. 04 THz is reported at 1. 04 THz once the vanadium dioxide film is adjusted to the metallic state, the metamaterial is changed to a terahertz absorber, and the maximum absorption rate of 94% is reported at 1. 04 THz. The switching process is explored by examining the electric field and power loss distributions, as well as the impedance matching scheme.

Source link: https://doi.org/10.1109/JPHOT.2021.3107533


Design of a Transparent Metamaterial Cross Polarization Converter With Large Incident Angle Range

In recent years, the metamaterial has been a widely used and effective tool in the electromagnetic polarization conversion process. The cross-polarization-converter simulation was conducted using the ANSYS HFSS, and the Floquet port and master slave boundary condition were set in the software.

Source link: https://doi.org/10.1109/JPHOT.2021.3107359

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions