A5019341476- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Electromagnetic wave absorption materials
- Acoustic Wave Phenomena Research
- Radar Systems and Signal Processing
- Electromagnetic Scattering and Analysis
- Topology Optimization in Engineering
- Advanced Multi-Objective Optimization Algorithms
- Nonlinear Dynamics and Pattern Formation
- Spectroscopy and Quantum Chemical Studies
- Ocean Waves and Remote Sensing
- Advanced SAR Imaging Techniques
- Composite Structure Analysis and Optimization
- Nonlinear Photonic Systems
- Noise Effects and Management
- Wind and Air Flow Studies
- Radio Wave Propagation Studies
- Aerodynamics and Acoustics in Jet Flows
- Cellular and Composite Structures
- Vibration Control and Rheological Fluids
- Microwave Engineering and Waveguides
- Autonomous Vehicle Technology and Safety
- Advanced Scientific and Engineering Studies
- Thermography and Photoacoustic Techniques
Beijing Institute of Technology
2017-2025
Peking University
2009-2011
Sound absorption structures, as an effective approach to reducing sound radiation, have always received extensive attention in the engineering of vibration and noise reduction. In this work, a novel compact multifunctional metastructure is proposed for both low-frequency broadband excellent crash energy dissipation. Cavity resonators with internally extended tubes (CRIET) hexagonal honeycomb configuration were selected unit components. An optimization method was against degradation from...
Due to substantial development of electronics and telecommunication techniques, materials with electromagnetic interference (EMI) shielding performance are significant in alleviating the impacts induced from a remarkable variety devices. In work, we propose novel sandwich structures for manipulating EM wave transport, which holds unique EMI features frequency selectivity. By employing electrical magnetic loss spacers, resultant endowed tunable performance, showing improvements overall...
The implementation of thin structure for broadband microwave absorption is challenging due to the requirement impedance match across several frequency bands and poor mechanical properties. Herein, we demonstrate a carbon fiber (CF) reinforced flexible hierarchical metastructure (HM) composed lossy materials including carbonyl iron (CI), multiwall nanotube (MWCNT), silicone rubber (SR) with thickness 5 mm optimal concentration selected from 12 formulas. Optimization periodical unit size...
Microwave absorber with broadband absorption and thin thickness is one of the main research interests in this field. A flexible ultrathin microwave comprising multiwall carbon nanotubes, spherical carbonyl iron, silicone rubber fabricated a newly proposed pyramidal spatial periodic structure (SPS). The SPS equivalent 3.73 mm covers -10 dB -15 bandwidth frequency range 2-40 GHz 10-40 GHz, respectively. excellent performance achieved by concentration dissipation electromagnetic field inside...
A resistive metasurface featured by the Rossler chaos reaction-diffusion system patterns is proposed and realized in a wideband electromagnetic absorber. The surface consists of units with both random shapes dimensions. Simulation results show absorption phenomenon, correlation function analysis indicates new wave-absorbing mode can be generated when edges matches geometrical size units. Experimental indicate unconventional bandwidth ratio reflectivity lower than –10, –15, –19 dB reaches...
Abstract Broadband sound absorption has consistently been a challenge in designing underwater structure (USAS). Most research of USASs achieve broadband through structural optimization, which curbs the freedom designing, and commonly alights it at expense increased thickness. In this paper, method is reported to broaden frequency band USAS by embedding membrane-type resonator into cavity, forming acoustic metamaterial. We demonstrate mechanism metamaterial theory, verify simulation...
Abstract Camouflage skills are important for understanding the relationship between predators and prey in ecological systems. Mimicry is a common strategy used by creatures to alter their appearance order blend with surroundings avoid detection. This paper unveils previously unknown camouflage that creates false object information positions of an visual range radar sensor vision. A dispersion‐modulated illusionary metasurface realize focal spot coding 3‐dimensional space fit imaging process...
An effective quasi-real-time inversion algorithm based on the super-resolution generative adversarial network (SR-GAN) is proposed to quantitatively image 2-D biaxial anisotropic scatterers. The SR-GAN was originally for purpose of reconstruction, which exactly fits need inverse problem. In addition, Visual Geometry Group (VGG) loss introduced extract high-level features object instead low-level pixel-wise error measures. angle-dependent reconstruction effect due dipole radiation as in...
ABSTRACT A concise transmissive/absorbing radome principle model is presented, which realizes flat‐top wide‐band transmission band and two electromagnetic absorbing wide located above beneath the band. Simulation indicates reflection signature of this structure could be reduced by over −10 dB out Frequency‐selective characters are achieved one resistive FSS layer metallic layers with nested square element, along dielectric spacer layers. An experimental‐demonstration sample plate fabrication...
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...
Since carbon-based structures of various dimensions, including one-dimensional (1D) carbon nanotubes, two-dimensional (2D) graphene and three-dimensional (3D) foams, have attracted significant attention as microwave absorption fillers, we present an exceptional hetero-junction filler with a 1D–2D–1D feature, achieved by manipulating 2D into 1D fibers in the fiber-extruding process under electric field. The as-fabricated structural fillers exhibited much-improved dielectric properties...
The realization of an ideal invisible cloak implementing transformation optics is still missing. An impedance matching concept implanted into to generate (IMC) shell. In this work, it proved that structure reduces the cloaking structure's disturbance a propagating electromagnetic field and improves its invisibility measured by scattering intensity. Such cylindrical IMC shell designed, fabricated with proposed rounded rectangular split-ring-resonators (RR-SRRs), experimental measurements show...
Abstract Material heterogeneity gives composite constructions unique mechanical and physical qualities. Combining multiple materials takes full use of these features in stress‐constrained topology optimization. Traditional research this field often assumes a consistent yield criterion for all possible but adapts their stiffness strengths accordingly. To cope with challenge, an innovative single‐variable interpolation approach is proposed to enable the simultaneous inclusion distinct criteria...
An ultrabroadband all-dielectric planar Luneburg lens has been designed and fabricated in this study, which is the form of a radial gradient lightweight honeycomb column. Because novel design symmetric honeycomb-like microstructure subwavelength dimension configuration according to refractive index distribution lens, present can focus incident plane waves on opposite side with high convergence, its operating frequency range rather broadband, spanning from 6 16 GHz. Besides, mass density 0.23...
Electromagnetic wave scattering suppression has applications in many scenes, including radio communication and electromagnetic compatibility. A large amount of research focuses on absorber structures with reflection at the −10 dB level, while beyond level is rather rare. In order to study formation higher suppression, metamaterial absorption composite function presented based coding sequence absorptive genetic components. The quantized experimental measurement result reaches −22.4...
The negative index of refraction nonlinear chemical waves has become a recent focus in dynamics researches. Theoretical analysis and computer simulations have predicted that the can occur on interface between antiwaves normal reaction-diffusion (RD) system. However, no experimental evidence been found so far. In this Letter, we report our design searching for such phenomenon chlorite-iodide-malonic acid (CIMA) reaction. Our results demonstrate competition at their determines fate wave...
Acoustic metasurfaces show non-traditional abilities in wave manipulation and provide alternate mechanisms for information communication invisibility technology. However, most of the remain narrow band (relative bandwidth ∼5%), a wideband trait is essential engineering applications. For example, controllable effective material properties—reflection or transmission phase—has barely been realized because intrinsic dispersion relation not always editable. In this paper, reflection phase editing...