Journal
MATERIALS LETTERS
Volume 239, Issue -, Pages 132-135Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.12.087
Keywords
Metamaterials; Microwave absorption; Composite materials; Multilayer structure; 3D printing
Funding
- National Natural Science Foundation of China, China [51575430, 61671466]
- National Key Research and Development Program of China, China [2017YFB1103401, 2016YFB1100902]
- Rapid Manufacturing Engineering Technology Research Center of Shaanxi Province, China [2017HBGC-06]
- Innovative Talent Promotion Program-Young Science and Technology Nova Program, China [2017KJXX-14]
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An ultra-broadband electromagnetic (EM) absorber composed of composite metamaterials was designed, fabricated and characterized. Polylactic-acid/reduced graphene oxide (PLA/RGO) composites with different amounts of RGO were prepared as a primary material collection. To provide good impedance matching and efficient wave attenuation, the multilayer absorbers were designed with a gradient index (GRIN) of characteristic impedance by manipulating the RGO content and the geometric parameters of the unit cell. The absorbers with different numbers of layers were fabricated by a material extrusion process, and then the reflection loss (RL) of the prepared samples was measured. Results showed that the methodology for designing a metamaterial absorber with gradient impedance and fabricating through a 3D printing process was effective in producing ultra-broadband absorbers. The seven-layer absorber achieved an absorption above 90% in a broad bandwidth of 4.5-40 GHz. This work could provide inspiration for upgrading the performance of some conventional absorbing composites through a rational design of the composite proportion and structure. (C) 2018 Elsevier B.V. All rights reserved.
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