Enhanced transmission efficiency of magneto-inductive wave propagating in non-homogeneous 2-D magnetic metamaterial array

Le, Thi Hong Hiep; Pham, Thanh Son; Khuyen, Bui Xuan; Tung, Bui Son; Ngo, Quang Minh; Hiền, Nguyễn Thị; Nguyen, Thai Minh; Vu, Dinh Lam

doi:10.1088/1402-4896/ac4a3a

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…In a superlens system where the thickness and the refractive of the lens are D and -1, respectively, the light transmitted through the lens converges to a secondary focal point located at a distance of 2D from the source. The introduction of the superlens theory has enabled the focusing of light into sub-wavelength regions, which surpasses the conventional limits of optical resolution in traditional lenses, catalyzing revolutionary advancements in fields such as optical imaging, biomedical sciences, and nanotechnology [15][16][17][18][19][20]. It is important to note that in the current EMM-enhanced WPT system, the EMM functions as a lens with a negative permeability for magnetic field regulation, thus enhancing the overall performance of the WPT system.…”

Section: Introductionmentioning

confidence: 99%

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Zhang,

Wang,

Wang

et al. 2023

Phys. Scr.

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It is a significant challenge to construct reconfigurable electromagnetic metamaterials that can precisely manipulate broadband megahertz electromagnetic waves. Herein, we report a reconfigurable electromagnetic metamaterial (REMM) composed of a two-dimensional periodic array of spiral copper-clad unit cells, each paralleled with a micro-tunable capacitor, which has nearly linear voltage-controlled properties. Moreover, the on-board integrated sample-and-hold modules, linked to all the REMM unit cells, are activated sequentially to perform precise voltage regulation of micro-tunable capacitors for controlling the electromagnetic properties of each unit cell. The experiment results demonstrate that the REMM sample has a maximum frequency adjustment range of 2.1 MHz, ranging from 8.7 MHz to 10.9 MHz with less than 0.1 MHz adjustment step. Furthermore, in a wireless power transfer system, the proposed REMM can achieve the desirable magnetic-field manipulation by precisely adjusting the permeability distribution compared with the traditional metamaterial slab merely capable of full-negative permeability. As a result, the power transfer efficiency (PTE) can be increased from 9.53% to 11.51% (1.69% for the case without the metamaterial slab), and approximately 3.5-fold improvement (from 0.28% to 0.98%) can be achieved when coils are misaligned. This work lays the foundation for the control of electromagnetic waves through using broadband and precise reconfiguration of megahertz electromagnetic metamaterials.

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Section: Introductionmentioning

confidence: 99%

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Zhang,

Wang,

Wang

et al. 2023

Phys. Scr.

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“…Examples of such unique properties include negative refractive index [4], inverse Doppler effect [5], cloaking [6], and electromagnetically-induced transparency (EIT) [7]. The ability to manipulate the resonance properties of each element in the metamaterial structure or to modify the interconnections between these elements allows us precise control over the resultant properties of metamaterial [8][9][10][11]. This facilitates the tailoring of the material's behavior according to the specific requirements and desires of the designer.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial Perfect Absorbers for Controlling Bandwidth: Single-Peak/Multiple-Peaks/Tailored-Band/Broadband

Zheng,

Pham,

Chen

et al. 2023

Crystals

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Metamaterial absorbers have garnered significant interest due to their unique electromagnetic properties, which facilitate the efficient absorption of electromagnetic radiation in a specific frequency range or multiple frequency ranges. The metamaterial absorbers are designed based on artificially engineered structures that enable tailored absorption properties. These structures might include multiple resonances or incorporate electrical resistive components to achieve broadband absorption. This review paper provides a comprehensive analysis of the progress made in the field of the bandwidth of metamaterial absorbers, encompassing the underlying design principles, key performance characteristics, diverse applications, and perspectives for further research. The paper draws to a conclusion by outlining the potential future directions for further advancements in this exciting area of research, and highlighting the challenges that need to be addressed for the widespread adoption of metamaterial absorbers.

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Wide-incident-angle, polarization-independent broadband-absorption metastructure without external resistive elements by using a trapezoidal structure

Pham,

Zheng,

Chen

et al. 2024

Sci Rep

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The absorption of electromagnetic waves in a broadband frequency range with polarization insensitivity and incidence-angle independence is greatly needed in modern technology applications. Many structures based on metamaterials have been suggested for addressing these requirements; these structures were complex multilayer structures or used special materials or external electric components, such as resistive ones. In this paper, we present a metasurface structure that was fabricated simply by employing the standard printed-circuit-board technique but provides a high absorption above 90% in a broadband frequency range from 12.35 to 14.65 GHz. The metasurface consisted of structural unit cells of 4 symmetric substructures assembled with a metallic bar pattern, which induced broadband absorption by using a planar resistive interaction in the pattern without a real resistive component. The analysis, simulation, and measurement results showed that the metasurface was also polarization insensitive and still maintained an absorption above 90% at incident angles up to 45°. The suggested metasurface plays a role in the fundamental design and can also be used to design absorbers at different frequency ranges. Furthermore, further enhancement of the absorption performance is achieved by improved design and fabrication.

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Enhanced transmission efficiency of magneto-inductive wave propagating in non-homogeneous 2-D magnetic metamaterial array

Cited by 5 publications

References 43 publications

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Metamaterial Perfect Absorbers for Controlling Bandwidth: Single-Peak/Multiple-Peaks/Tailored-Band/Broadband

Wide-incident-angle, polarization-independent broadband-absorption metastructure without external resistive elements by using a trapezoidal structure

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