• 文献标题:   Ultra-broadband metamaterial absorber with graphene composites fabricated by 3D printing
  • 文献类型:   Article
  • 作  者:   YIN LX, TIAN XY, SHANG ZT, LI DC
  • 作者关键词:   metamaterial, microwave absorption, composite material, multilayer structure, 3d printing
  • 出版物名称:   MATERIALS LETTERS
  • ISSN:   0167-577X EI 1873-4979
  • 通讯作者地址:   Xianning West Rd 28
  • 被引频次:   10
  • DOI:   10.1016/j.matlet.2018.12.087
  • 出版年:   2019

▎ 摘  要

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.