A5005505286- Advanced Antenna and Metasurface Technologies
- Metamaterials and Metasurfaces Applications
- Electromagnetic wave absorption materials
- Antenna Design and Analysis
- Energy Harvesting in Wireless Networks
- Nanomaterials and Printing Technologies
- Laser and Thermal Forming Techniques
- Electrohydrodynamics and Fluid Dynamics
- Aerosol Filtration and Electrostatic Precipitation
National University of Defense Technology
2020-2024
Metal mesh films have been shown to be a promising strategy effectively mitigate the growing issue of electromagnetic interference (EMI) in optoelectronic systems. To achieve superior shielding effectiveness, it is common increase thickness film. However, mesh-based materials frequency-dependent effectiveness that decreases as frequency increases. Simply increasing cannot enhance EMI at high frequencies. This will further lead challenges such increased processing difficulties and higher...
In this letter, a flexible and frequency-reconfigurable bandstop frequency selective surface (FSS) is studied theoretically experimentally. The FSS patterns are fabricated on an ultrathin substrate through screen printing, low-cost, high-efficiency additive manufacturing methodology. With the embedded varactors biased from 0 to 20 V, resonant tuning 3.5 5.7 GHz was measured. Outstanding wide angular stability under different bias voltages has also been examined in theory measurement by...
To satisfy the demands of wireless communication systems for tunable shielding materials, in this work, a graphene/ion gel/graphene sandwich structure is proposed, based on graphene and solid ionic material ion gel. After modelling, preparing testing, it was found that could achieve more than 10 dB effectiveness tuning GHz THz bands. Meanwhile, adjusting speed also studied, displaying effective dynamic second order. Furthermore, fabricated samples have advantages low profile, easily...
Electrically tunable metamaterial is attracting extensive attention recently for its potential in electromagnetic compatibility (EMC) and radar scattering manipulation, while still remains a great deal of challenges tunability. In this paper, conductivity graphene-ion gel-graphene (GIG) sandwich structure fabricated measured to investigate the properties ion gel, showing advantages over liquid on flexibility Besides, frequency amplitude dual-tunable absorber based GIG proposed, modeled...
Transparent electromagnetic interference (EMI) shielding film has a wide range of applications in the optoelectronic and display systems military, aerospace other fields, which attracted widespread attentions. In this paper, electrohydrodynamic jet printing method was introduced into additive preparation transparent conductive films, batch flexible EMI films with good effectiveness low cost were achieved simple easy way. We utilized technique to directly print grid-like micro structure on...
This paper proposes a graphene-based flexible printed attenuator consisting of microwave transmission line and graphene/ion-gel tunable structure, which can realize the signals with attenuation have conformal characteristics. According to adjustable resistivity graphene in band, we utilize ion-gel produce electric double layer (EDL) effect adjust conductivity at low bias voltage. The coplanar waveguide (CPW) is prepared on substrate by screen printing process. implementation this relies...
With the increasing complexity of electromagnetic environment, interference has already been an important problem for optoelectronic systems to be reckoned with. The metal mesh film is a kind widely used shielding material with both visible and infrared transparency. However, performance previously reported materials frequency dependent. Here, we report infrared-transparent windows based on irregular patterns. coatings are prepared sapphire substrate using ultraviolet photolithography...