A5067195058- Advanced Antenna and Metasurface Technologies
- Electromagnetic wave absorption materials
- Metamaterials and Metasurfaces Applications
- Supercapacitor Materials and Fabrication
Hunan University
2017-2019
Water is one of the most promising dielectric materials for microwave absorption due to its superior broadband loss. Inspired by mechanism traditional metamaterials, we have designed a water-based loss absorber based on 3D-printing technology. Through stepwise structural optimization, fabricated flexible metamaterial experimentally demonstrated an ultra-broadband in frequency range 5.9–25.6 GHz with thickness 4 mm. Meanwhile, angular tolerance also wide-angle capability. All these properties...
Fishnet metamaterials have shown their excellent absorption at terahertz and optical frequencies. Here, we experimentally demonstrate an ultra-broadband lightweight microwave absorber by fabricating a conventional magnetic absorbing material into fishnet-like structure. Compared with the pure material, broadest bandwidth (less than −10 dB) of is extended from 7.4–11 GHz to 4.8–20.7 GHz. Meanwhile, high surface density, which important shortcoming for materials, has been reduced clearly...
Composite microspheres with carbonyl iron cores and graphite shells are prepared by a mechanical ball milling method. The microwave absorption properties of these investigated in terms complex permittivity permeability, impedance matching property, reflection loss. morphology conductivity the can be well tuned controlling time to achieve improvement its characteristics. In addition, integration composition unique structure, iron/graphite possess better than graphite. show highly strong...
MoS2 is a promising material with microwave absorption performance due to its high dielectric properties and low density. However, pure non-magnetic has bad impedance matching characteristic. In this study we prepared the Ni/MoS2 nanocomposites by cladding micrometer slices magnetic Ni nanoparticles. Our results show that of have been improved obviously compared MoS2. Because introduction particles, permeability turned from one complex, indicating newly added loss. Meanwhile, big gap between...
Core–shell structured Fe/C have been successfully derived from a metal-organic framework for microwave absorbing. Based on the measured electromagnetic parameters, it is found that maximum reflection loss (RL) of reaches [Formula: see text][Formula: text]dB at 5.8[Formula: text]GHz with thickness 3.0[Formula: text]mm and broadest absorption bandwidth ([Formula: text]dB) up to 6.0[Formula: (from 11.2 17.2[Formula: text]GHz) 1.5 mm. The excellent mainly ascribed multiple reflections, good...
A novel Fe/nanoporous carbon (Fe/NPC) composite was synthesized via Fe 3 O 4 nanoparticles coating in metal–organic framework. The pyrolysis conditions are carefully optimized, and the effects of temperature on electromagnetic parameters have been systematically analyzed. Among these candidates, Fe/NPC pyrolyzed at 800 °C (Fe/NPC‐800) shows eminent microwave absorption due to interface polarization well matched characteristic impedance. results indicate that effective reflection loss...
A broadband absorber for the microwave region based on a dielectric structure with ball-milled graphite gratings has been proposed. In this absorber, electromagnetic waves in frequency range of 5.4 to 18 GHz are absorbed efficiently more than 90% absorptivity. The high imaginary part its permittivity used work can exhibit loss some extent, while there is almost no magnetic owing low permeability. By comparing electric field single absorbing layer and our grating structure, we found that λ/4...