Advanced searches left 3/3

Metamaterial - Springer Nature

Summarized by Plex Scholar
Last Updated: 15 May 2022

* If you want to update the article please login/register

Tunable dissipation in elastic metamaterials via methodic reconfiguration of inertant mechanical networks

Due to their unique capabilities in the field of wave propagation and control, Elastic metamaterials have developed transformative solutions to applications in structural mechanics. By a free wave propagation scheme, waves that are not driven at a specific frequency are calculated for locally resonant flexural beams with six inertant networks representative of the design spectrum, i. e. , waves that are not driven at a specific frequency. The selection of the inertant network, coupled with appropriate damping installation within the host structure or the resonating substructure can be modified to produce a prompt damped response that is best suited for a specific application based on the frequency range of interest.

Source link: https://doi.org/10.1007/s11012-022-01482-z


E-shape metamaterials embedded implantable antenna for ISM-band biomedical applications

Purpose This paper introduces a compact antenna based on two separate metamaterial resonators, the E-shape resonators, and the interdigital resonators, which are suitable for biomedical implant applications. The implantable antennas feature two layers of substrate; the lower layer contains MTM resonators and the upper layer, which includes the superstrate layer. The specific absorption rates of the proposed antennas were also determined in the layer model in order to determine electromagnetic energy leakage to human tissues. Conclusion The proposed antennas' findings are valid and safe for biomedical applications and human body protection, as measured by SARs.

Source link: https://doi.org/10.1007/s42600-021-00191-y


High-sensitivity detection of trace imidacloprid and tetracycline hydrochloride by multi-frequency resonance metamaterials

Terahertz metamaterial is one of the most common detection techniques with high sensitivity by increasing the interaction between light and matter. In THz MMs, the low and high-frequency resonant modes coexisted, but imidacloprid's experimental sensitivity of imidacloprid up to 0. 1 ng could only be detected under HFRM. THz MMs, a multi-frequency resonator, can be useful for the high-sensitivity detection of trace pesticide residues in agricultural products.

Source link: https://doi.org/10.1007/s11694-022-01314-4


Triple-band terahertz metamaterial absorber using surface structure of two metallic split rings of same-size connected by a non-centrally-placed metallic strip

This patterned surface structure is made of two similar-sized gold split rings connected by a gold strip, which is marginally deviated from the geometric center, resulting in unequal dimensions on the left and right sides of the surface structure. The number of absorption peaks and the resonance frequencies of these peaks can be adjusted by changing the connecting gold strip's deviation position and the parameters of the two gold split rings. The number of absorption peaks will change as a result of the center position, and three resonance absorption peaks will be achieved. In addition, the two gold split rings' width and length will alter the resonance frequencies of the three absorption peaks.

Source link: https://doi.org/10.1007/s11082-022-03753-1


Recent advances in radio-frequency negative dielectric metamaterials by designing heterogeneous composites

Material characteristics such as determining the response of materials to electromagnetic waves or electrical field are usually positive, and the dielectric constant is one of the basic physical parameters for materials, determining the response of materials to electromagnetic waves or electrical field. The negative dielectric property has risen to the forefront of research as a critical component for the production of metamaterials with unique and unusual electromagnetic characteristics not present in naturally occurring materials, such as negative refraction, perfect difficulties, and reverse Doppler effect. We investigated the most recent advances in negative dielectric technology built in several heterogeneous composites, including metal composites, carbon composites, ceramic composites, and polymer. In addition, the problem is unsolved and perspectives on negative dielectric property have been presented; we hope to shed some light on the process of negative dielectric property as well as its relationship with the material composition and microstructure; Graphical abstract Negative dielectric constant is regarded as a supernormal result, and advances in negative dielectric property fabricated in certain heterogeneous composites have been lauded.

Source link: https://doi.org/10.1007/s42114-022-00479-2


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

The copper resonator at one side is mounted on a FR4 substrate, with the copper resonator at one end, as shown by two square rings and one circular split ring on one side. The two square rings are linked together around the split ring's split gap, while two split semicircles are also attached together near the split gaps. Likewise, a different series of unit cells provides a similar response to the unit cell as compared to numerical simulation performed in CST microwave studio and verified by measurement. Circuit simulation is performed in ADS by comparing S_21 obtained in ADS with the same as CST, and it's modelled for the new MTM unit cell in Advanced Design System software, and circuit validation is achieved. A test antenna is designed to record the MTM's behavior over it.

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


Digital Light Processing 3D-Printed Ceramic Metamaterials for Electromagnetic Wave Absorption

Abstract The use of 3D printing for fabricating electromagnetic wave-absorbing metamaterials has attracted a lot of attention. This paper describes a novel ultraviolet-curable polysiloxane precursor for digital light processing 3D printing to produce ceramic parts with intricate geometry, no cracks, and linear shrinkage. Even under high temperatures, the corresponding ceramic metamaterials can be made with DLP printing and subsequent pyrolysis process, resulting in a low reflection coefficient and a wide effective absorption bandwidth in the X-band.

Source link: https://doi.org/10.1007/s40820-022-00865-x


Metamaterial Loaded Endfire Circularly Polarized High-Gain Microstrip Patch Antenna for L Band Frequency Applications

The antenna's range is increased by truncating the ground plane, and circular polarization is achieved by inserting two diagonally placed plus-shaped slots in the radiator. Using a new wideband metamaterial electronic bandgap structure embedded underneath the antenna, the estimated gain of the fabricated antenna has increase by 7. 3 dBi. The incorporation of this metamaterial is also changing the omnidirectional pattern to the endfire radiation. Using a full-wave electromagnetic simulator, the simulation and analysis of the proposed wideband circularly polarized antenna and metamaterial can be carried out. The antenna's prototype is constructed and tested.

Source link: https://doi.org/10.1007/s40998-022-00501-9


Design of Bio-implantable Antenna Using Metamaterial Substrate

For biotelemetry application, a compact microstrip patch antenna is developed using metamaterial-based split-ring resonators. At which the return loss is 31 dB and 18. 5 dB respectively within the skin, Antennas resonating frequency is 2. 45 GHz and 5. 75 GHz. For validation of results, antenna performances are tested within a vitro solution of skin mimicking fluid. This small-scale miniaturized implantable antenna is suitable for biomedical applications.

Source link: https://doi.org/10.1007/s11277-021-09414-y

* 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