A5101690000- Advanced Antenna and Metasurface Technologies
- Metamaterials and Metasurfaces Applications
- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Electromagnetic wave absorption materials
- Innovative concrete reinforcement materials
- Microwave and Dielectric Measurement Techniques
- Acoustic Wave Resonator Technologies
- Structural Behavior of Reinforced Concrete
- Antenna Design and Optimization
- RFID technology advancements
- Concrete Corrosion and Durability
- Advanced Sensor and Energy Harvesting Materials
- Rock Mechanics and Modeling
- Advanced machining processes and optimization
- Gold and Silver Nanoparticles Synthesis and Applications
- Electronic and Structural Properties of Oxides
- Millimeter-Wave Propagation and Modeling
- Microwave Dielectric Ceramics Synthesis
- Plasmonic and Surface Plasmon Research
- Analytical Chemistry and Sensors
- Dielectric materials and actuators
- Ferroelectric and Piezoelectric Materials
- Spaceflight effects on biology
- Advanced Manufacturing and Logistics Optimization
Shijiazhuang Tiedao University
2020-2024
Zhejiang University
2023
Beijing University of Posts and Telecommunications
2015-2020
State Key Laboratory of Information Photonics and Optical Communications
2015-2017
Tsinghua University
2016
Southwest Jiaotong University
2006
Abstract A kind of pollution known as electromagnetic interference (EMI), which results from ubiquitous usage various electronic communication and military radar equipment, has been receiving increasing attention recently. However, large-area EMI shielding on transparent and/or curved surfaces, including building windows, glass wall, special requirements spaces (SRSs), remains hard to achieve. In this paper, a silver nanofiber (AgNF) based flexible film was successfully assembled via...
Abstract All‐dielectric metamaterials with low loss are a rapidly developing research hotspot in the field of metamaterials, and offer additional design freedom for electromagnetic devices. Many types fabrication techniques used to prepare all‐dielectric so as realize specific physical properties. A key efficient manipulation is proper choice technique, which enables be easily coupled integrated Here, an overview existing provided. Based on material compositions accuracy requirements,...
All-dielectric metamaterials have emerged as a promising platform for low-loss and highly efficient terahertz devices. However, existing fabrication methods difficulty in achieving good balance between precision cost. Here, inspired by the nano-template-assisted self-assembly method, we develop micro-template-assisted (MTAS) method to prepare large-scale, high-precision, flexible ceramic microsphere all-dielectric with an area exceeding 900 cm×900 cm. Free from organic solvents, vacuum,...
Abstract Manufacturing a flexible, light, large-area, and high-efficiency electromagnetic shielding materials in straightforward cost-effective manner presently remains significant challenge. In this work, we propose conductive network design verify its interference (EMI) effectiveness (SE) by simulation. Using the structure parameters obtained simulation, prepare flexible EMI material using silver nanowires (AgNWs)/polyvinyl butyral (PVB) ethanol solution textile substructure via facile...
A magnetically tunable metamaterial perfect absorber (MPA) based on ferromagnetic resonance is experimentally and numerically demonstrated. The ferrite-based MPA composed of an array ferrite rods a metallic ground plane. Frequency dependent absorption the under series applied magnetic fields discussed. An peak induced by appears in range 8–12 GHz certain field. Both simulated experimental results demonstrate that frequency can be tuned This work provides effective way to fabricate absorber.
Abstract Electromagnetic interference (EMI) is a type of pollution that caused by the ubiquitous usage electronic communication in general, and military radar equipment particular. Even though this common problem for long time, fabrication large‐area, flexible, robust EMI shielding materials still challenge today. In work, 3D meshing strategy simulated most efficient utilization metallic silver X‐band shielding, propose roll‐to‐roll (R2R) process to fabricate robust, large‐scale sponge,...
An ultra-wideband polarization conversion metasurface based on S-shaped metallic structure is designed and prepared. The simulation results show that the bandwidth 14 GHz for linearly polarized normally incident electromagnetic waves cross-polarized reflectance more than 99% in range of 10.3 GHz–20.5 GHz. On premise high reflection efficiency, reflective phase can be regulated by changing geometrical parameter structure. A gradient composed six periodically arrayed unit cells proposed...
Crack detection on metallic surfaces is important for the inspection of critical devices. In this paper, a high-sensitivity near-field waveguide sensor loaded with dielectric resonator crack demonstrated. Both numerical and experimental results reveal that resonator-based can effectively detect cracks surface. The maximum depth sensitivity 0.71 GHz/mm width 1.24 GHz/mm, resulting from localized electric field energy in broad side sensor. This work will be interest to development related applications.
Tunable metasurfaces have emerged as an efficient approach to manipulate the wave propagation. Different from previous work concentrating on electrically tunable mechanisms, here we demonstrate a magnetically metasurface composed of ferrite rods and metallic foils. By tuning thickness rods, with different rod gradients are obtained. The incident can propagate through due extraordinary transmission. deflection angle transmission is not only influenced by gradient, but also tuned applied...
A terahertz metasurface perfect absorber with multi-band performance is demonstrated. The composed of a ground plane and four split-ring resonators (SRRs) different dimensions, separated by dielectric spacer. numerical simulation results illustrate that the proposed has distinct absorption peaks at resonance frequencies 4.24, 5.66, 7.22, 8.97 THz, rates 96.8%, 99.3%, 97.3%, 99.9%, respectively. Moreover, corresponding full width half-maximum (FWHM) values are about 0.27, 0.35, 0.32, 0.42...
An all-dielectric transparent metamaterial absorber with encapsulated water is demonstrated in this paper. Because the proposed realized using only and polydimethylsiloxane (PDMS) without any conductive patterns, optical transparency achieved. In addition, high dielectric loss of renders it a good candidate for an electromagnetic absorber. The absorptivity increased by encapsulating within PDMS, numerically compared that PDMS same size. When two layers, 92.5% achieved at 10.8 GHz, exceeds...
Tunable wideband microwave bandstop filters have been investigated by experiments and simulations. The negative permeability is realized around the ferromagnetic resonance frequency which can be influenced demagnetization factor of ferrite rods. For filter composed two rods with different size, it exhibits a -3 db stop bandwidth as large 500 MHz, peak absorption -40 an out-of-stopband insertion loss -1.5 db. This work provides new way to fabricate filters.
Magnetically tunable microwave bandpass filter structure have been designed and prepared by filling the ferrite rods into metallic slits. The electromagnetic wave cannot propagate through By slits, an enhanced optical transmission is obtained, which can be ascribed to ferromagnetic resonance of rods. Both experimental simulated results show center frequency bandwidth passband tuned applied magnetic field, exhibits a magnetically behavior. This approach opens way for designing filters.
By placing two pairs of dielectric cubes and ferrite cuboids symmetrically on both sides a single subwavelength aperture, we realize magnetically tunable dual-band transmission. One transmission peak is induced by the Mie resonance cubes, other one ferromagnetic cuboids. The enhancement controlled can be tuned adjusting applied magnetic field, which confirmed experimental simulated results. This work provides way to enhanced through has greater potential for filters.
Terahertz absorber has attracted much attention. However, most of them have complex structures and narrow bandwidth. Here, a wideband terahertz metasurface based on Mie resonance is demonstrated. The prepared by combining four dielectric resonators with different permittivity values into single unit cell. absorption the goes beyond 80% from 8.37 to 8.60 THz, showing performance. In addition, center frequency can be tuned size resonators, which makes proposed suitable for applications in devices.
SrTiO3(STO):Pr3+ nanopowders are synthesized because of their excellent photoluminescence (PL) performance. The PL intensity is enhanced by morphological control and oxygen vacancy. “TEG-sol” method used to prepare STO:Pr3+ with a size lower than 10 nm. Abundant vacancies formed in the without any further processing. effect annealing temperature on properties systematically studied. Bright green-white emission achieved from pristine STO:Pr3+. Red obtained after at higher 400 °C. A flexible...
A wideband metasurface filter based on complementary split-ring resonators (CSRR) has been prepared. The frequency and transmission bandwidth of the filters with different split widths are discussed. After analyzing mechanism metasurface, proposed fabricated. electromagnetic properties measured by a designed test system. results in good agreement simulated ones, which shows that property. As width CSRR increases, passband shifts to higher regions decreases.