• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (3): 276-283.doi: 10.3901/JME.2022.03.276

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Research on Fused Deposition Integrated Manufacturing Process and Electromagnetic Camouflaging Properties of Metasurface Heterostructure

LIANG Qingxuan, YIN Haoyu, LI Zhaohui, DUAN Yubing, WANG Xin, LI Dichen   

  1. School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049
  • Received:2021-07-18 Revised:2021-12-09 Online:2022-02-05 Published:2022-03-19

Abstract: The integrated manufacturing of curvilinear conformal dielectric substrates and ordered metal unit cells of metasurface heterostructure is a bottleneck problem that hinders the development of metasurface electromagnetic camouflaging technology to engineering application. With the advantages of high design freedom and suitable for rapid prototyping of complex structures by 3D printing technologies, a fused deposition integrated manufacturing process of liquid metal and polymer heterostructure is proposed. Based on the existing polymer fused deposition molding (FDM) process, the stable deposition of fused Sn-Bi liquid metal on the polylactic acid (PLA) substrate is realized by the interface reinforcing mechanism of hot pressing and microstructure embedment. Afterward, the controllable forming of metal lines is realized by optimizing the process parameters such as printing extrusion flow and layer height. And the complex structure forming ability of fused deposition integrated manufacturing process is significantly improved by motion command correction and dynamic flow compensation. Finally, a trapezoidal metasurface electromagnetic camouflage structure is fabricated by the proposed fused deposition integrated manufacturing process of liquid metal and polymer. The electromagnetic measurement results show that the maximum generalized radar cross section (RCS) reduction of the designed metasurface sample is about -14.1 dB at x-polarization in the normal incidence electromagnetic wave, i.e. the electromagnetic reflection characteristics of the metasurface sample and the camouflage target reach about 96.1% similarity, and the 3 dB reduction (i.e. RCS reduced to 50%) bandwidth is about 33.6%, showing excellent electromagnetic camouflaging properties. An effective method is provided by the fused deposition integrated manufacturing process of liquid metal and polymer for the manufacturing of curvilinear conformal metasurface heterogeneous functional structures, which provides manufacturing technology support for promoting the development of metasurface to engineering applications.

Key words: metasurface, electromagnetic camouflage, heterostructure, fused deposition modeling, integrated manufacturing

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