Topological trivial and nontrivial properties in electromagnetic metamaterials

Reviews in Physics, Journal Year: 2025, Volume and Issue: unknown, P. 100104 - 100104

Published: Jan. 1, 2025

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Composite structure design for broadband metamaterial absorption: Integrated nonlinearity and enhanced performance using lumped resistors

Journal of Applied Physics, Journal Year: 2025, Volume and Issue: 137(9)

Published: March 4, 2025

A new ultrathin and broadband metamaterial absorber featuring four integrated lumped resistors is presented examined. The design incorporates nonlinearity to enhance the absorber's performance. This achieves absorption, maintaining absorption levels above 90% across 1.33–3.57 GHz frequency range. demonstrates simultaneous negative permittivity permeability, with bandwidths of approximately 670 MHz in L-band around 1.57 S-band, resulting a total bandwidth 2.24 GHz. fractional an impressive 91%, exceeding previously reported absorbers. Furthermore, remarkably thin, at 0.097 λ, lowest frequency. absorber, its fourfold symmetry, insensitive polarization angles up 180° maintains stable 40° for both TE TM modes. Validation using advanced system software shows close agreement computer simulation technology results. In summary, proposed FoM value 1.68 effective medium ratio 9.09, highly desirable, offering significant performance benefits, including high efficiency, broad operational bandwidth, minimal thickness, making it suitable applications. Finally, was manufactured tested validate offers flexible adaptable solution various fields. It finds applications radar systems, satellite wireless communications, environmental sensing monitoring, stealth technology, IoT smart devices.

Language: Английский

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A tunable electromagnetic wave absorber for uniform reflection modulation in broadband

Journal of Applied Physics, Journal Year: 2025, Volume and Issue: 137(12)

Published: March 24, 2025

The development of broadband, tunable electromagnetic wave absorbers with stable reflectivity is crucial for real-time reconfigurable applications, particularly in radar systems. Conventional often rely on absorption band shifts, which may lead to non-uniform profiles. A broadband absorber based wideband unit configuration proposed, enables real-time, uniform control broad frequency range from 4 18 GHz (relative bandwidth 90.9%). Unlike conventional absorbers, primarily the proposed maintains a flat profile over entire range. Furthermore, it exhibits characteristics oblique incidence angles ranging 0° 30°. Reflectivity controlled via adjustment bias voltage, and experimental results show excellent agreement simulation predictions, validating design. unique capabilities this bring great application potential adaptive display technologies, communication systems, dynamic

Language: Английский

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Review of micro and nano scale 3D printing of electromagnetic metamaterial absorbers: mechanism, fabrication, and functionality

Virtual and Physical Prototyping, Journal Year: 2024, Volume and Issue: 19(1)

Published: July 22, 2024

Electromagnetic metamaterial absorbers (MMAs), with pivotal roles in applications such as stealth and communication, have revolutionised the field of absorbing materials by offering unique characteristics unattainable natural through artificially designed unit cell structures. Although many MMAs been successfully prepared traditional micro/nano fabrication processes, inherent limitations persist. 3D printing, or additive manufacturing, offers unprecedented design freedom streamlined production processes for MMAs. This review provides a comprehensive examination 3D-printed It first introduces fundamental concepts history brief description techniques MMA fabrication. Subsequently, it elucidates mechanisms governing loss absorption electromagnetic materials, shedding light on principles. Next, this centres printing modalities employed to fabricate categorising into one-step two-step manufacturing that leverage advantages printing. Moreover, also delves innovative 4D-printed MMAs, showcasing potential dynamically adjustable In end, future research directions are discussed taking consideration current concerns. underscores transformative impact paving new avenue innovations engineering.

Language: Английский

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Broadband spin-decoupled metasurface for independent wavefront manipulations of orthogonal circularly-polarized waves

Physica Scripta, Journal Year: 2024, Volume and Issue: 99(6), P. 065557 - 065557

Published: May 14, 2024

Abstract Metasurfaces endowed with spin-decoupled functionalities offer the capability to meticulously customize electromagnetic wavefronts of incident dual orthogonal circularly-polarized (CP) waves in a desirable manner, that holds immense potential for broadening their application fields. Nevertheless, major lack persists most metasurfaces is limited bandwidth or intricate design requirements. Herein, we propose broadband metasurface, consisted weak-resonant mirror-symmetry unit structures, enables independent and distinct wavefront manipulations under incidence CP waves. As demonstration, present dual-channel metasurface integrates geometric propagation phases generate vortex two modes wide frequency range from 10 GHz 16 GHz. Both simulated experimental results are consistent collectively confirm validity our proposed metasurface. The research provides practical efficient avenue constructing within broad band.

Language: Английский

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High-performance NiTi-C nanofibers microwave absorbent prepared by electrospinning

Materials Today Communications, Journal Year: 2024, Volume and Issue: 39, P. 109245 - 109245

Published: May 19, 2024

Language: Английский

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