研究目的
To design, fabricate, and characterize an ultra-broadband electromagnetic absorber using composite metamaterials with gradient impedance, aiming to achieve efficient absorption and wide frequency bandwidth.
研究成果
The methodology for designing and fabricating metamaterial absorbers with gradient impedance using 3D printing is effective, achieving ultra-broadband absorption (4.5-40 GHz) with high efficiency and reduced thickness. This approach can inspire improvements in conventional absorbing composites and the development of novel absorbers.
研究不足
The study is limited to the frequency range of 2-40 GHz and specific composite materials (PLA/RGO). The fabrication process may have constraints in precision or scalability for industrial applications. Potential optimizations could include exploring other materials or broader frequency ranges.
1：Experimental Design and Method Selection:
The study involved designing multilayer metamaterial absorbers with a gradient index (GRIN) of characteristic impedance by manipulating RGO content and geometric parameters of unit cells. A material extrusion 3D printing process was used for fabrication.
2：Sample Selection and Data Sources:
Composites of polylactic acid (PLA) and reduced graphene oxide (RGO) with varying RGO content (0-5 wt%) were prepared. Samples for electromagnetic parameter measurement had specific dimensions for X and Ku bands.
3：List of Experimental Equipment and Materials:
Equipment included vector network analyzers (8720ES, hp, USA and E8363B, Agilent Technologies, USA), and materials included PLA, RGO, and aluminum backing.
4：Experimental Procedures and Operational Workflow:
Complex permittivity was measured using the coaxial line method. Reflection loss (RL) was measured with samples attached to an aluminum backing.
5：Data Analysis Methods:
Characteristic impedance and attenuation constant were calculated using provided equations. Data analysis involved comparing RL across different layer numbers and frequencies.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
