Design of functionally gradient metastructure with ultra-broadband and strong absorption

被引:10
|
作者
Sun, Chengtao [1 ]
Li, Dawei [1 ,2 ]
Liu, Tingting [1 ]
An, Qing [1 ]
Zhang, Changdong [1 ]
Li, Yaoyao [3 ]
Liao, Wenhe [1 ,2 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Peoples R China
[2] Nanjing Univ Sci & Technol, Sch Mech Engn, Key Lab Special Engine Technol, Minist Educ, Nanjing 210094, Jiangsu, Peoples R China
[3] Shanghai Acad Spaceflight Technol, Shanghai Inst Spacecraft Equipment, Shanghai 200240, Peoples R China
关键词
Lattice; Metastructure absorbers; Ultra; -broadband; Strong absorption; METAMATERIAL ABSORBER;
D O I
10.1016/j.compositesb.2024.111484
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Rational design principles for ultra-broadband lattice-based metastructure absorbers (MMAs) remain scarcely explored, including elucidation of the governing absorption phenomena. This work presents Octet truss lattices gradient-tailored to achieve highly efficient wide-spectrum electromagnetic (EM) wave mitigation. The optimized 15 mm thick three-dimensional printed architectures comprise three stacked sub-layers with graduated densities spanning a reflective backing. Analysis of unit cell EM responses as a function of geometric parameters facilitates concurrent broadband absorption and minimal mass. Consequently, ultra-wideband absorption below -10 dB persists from 2.84 to 40.0 GHz under normal incidence, with strongly enhanced attenuation below -15 dB between 8.51 and 40.0 GHz. Additionally, consistent absorption capacity endures up to 60 degrees for both transverse electric (TE) and transverse magnetic (TM) polarizations, empowered by the intricate conductive networks established through wave interactions. The unique combination of additive manufacturing, hierarchical metamaterial engineering, and physical insights provides a versatile strategy for customized broadband absorption systems across application domains.
引用
收藏
页数:12
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