| CHEN Meng-zhou,WANG Liu-ying,LIU Gu,GE Chao-qun,WANG Long,XU Ke-jun,WANG Wei-chao.Design and Optimization of Multilayer Broadband Metamaterial Absorbing Structure Based on CNTs/PLA[J],52(11):366-376, 385 |
| Design and Optimization of Multilayer Broadband Metamaterial Absorbing Structure Based on CNTs/PLA |
| Received:September 16, 2022 Revised:March 08, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.11.031 |
| KeyWord:3D printing metamaterial absorbing structure broadband absorption light weight angle independence absorption mechanism |
| Author | Institution |
| CHEN Meng-zhou |
Rocket Force University of Engineering, Xi'an , China |
| WANG Liu-ying |
Rocket Force University of Engineering, Xi'an , China |
| LIU Gu |
Rocket Force University of Engineering, Xi'an , China |
| GE Chao-qun |
Rocket Force University of Engineering, Xi'an , China |
| WANG Long |
Rocket Force University of Engineering, Xi'an , China |
| XU Ke-jun |
Rocket Force University of Engineering, Xi'an , China |
| WANG Wei-chao |
Rocket Force University of Engineering, Xi'an , China |
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| Abstract: |
| The designability of electromagnetic properties of the metamaterial structure provides it a broad range of potential application in the fields of electromagnetic wave absorption, electromagnetic shielding and wireless communication. In order to address the issues with traditional metamaterial structure, such as high density and sensitivity to oblique incident angle, a new three-dimensional multilayer broadband metamaterial absorbing structure was designed and prepared from the perspectives of micro-composite absorbing materials and macro-structure. In this work, the carbon nanotubes and polylactic acid (CNTs/PLA) composite absorbing material was prepared by mechanical stirring and melt blending method. The electromagnetic simulation software CST was used to design, simulate and optimize the proposed multilayer absorbing metamaterial structure through the obtained electromagnetic parameters. The structural parameters of metamaterial structure were optimized by the parameter sweep function in CST. Meanwhile, the absorption mechanism of the metamaterial structure was revealed and demonstrated through the analysis of the effective impedance and the distribution of electric field, magnetic field and power loss. The proposed absorbing metamaterial structure was fabricated by the fused deposition modeling (FDM) of 3D printing technology. The microscopic morphology and electromagnetic properties of the prepared materials and metamaterial structure were characterized by the scanning electron microscope (SEM) and vector network analyzer (VNA). The CNTs were uniformly distributed in PLA due to the combination of mechanical stirring and melt blending. When the CNTs content of composite filaments was 10%, the mechanical properties and electromagnetic wave absorption capability of the composite filaments were relatively good, and the overall performance of composite filaments reached its optimum. When the thickness of composite absorbing material was 1.7 mm, the effective bandwidth reached a maximum of 3.9 GHz. When the thickness was 3.2 mm, the reflectivity reached the lowest value of –53.1 dB. The excellent broadband electromagnetic wave absorption performance could be found through the design of multilayer metamateial structure, which was based on the composite filaments with the 10% CNTs content. Furthermore, the metamaterial absorbing structures in different shapes had various coupling relationships to incident electromagnetic waves. The circular multilayer metamaterial absorbing structure had the optimum electromagnetic absorption performance when R=11 mm, with the minimum reflectivity RLmin= –53.9 dB, the effective bandwidth EAB=33.1 GHz and the average reflectivity RLaverage= –17.1 dB. Moreover, this proposed circular multilayer metamaterial absorbing structure also could maintain the broadband and strong microwave absorption with the incident angle from 0° to 60° for TE polarization and 0° to 70°for TM polarization. In conclusion, through the combination of PLA with good biocompatibility and CNTs with excellent absorption performance, the composite filaments with both outstanding electromagnetic waves absorbing capability and mechanical property can be successfully produced by varying the mixing ratio. This process provides the basis for the design of the multilayer metamaterial absorbing structure. The multilayer design greatly improves the impedance matching characteristics of the metamaterial absorbing structure, while the symmetrical structure is beneficial to its wide-angle electromagnetic wave absorption. In general, the multilayer metamaterial absorbing structure design for electromagnetic wave absorption realizes the application needs of light weight and broadband absorption through the joint action of micro-composite materials and macro-structure design. It can provide theoretical and technical support for the engineering application of lightweight broadband metamaterial absorbing structures. |
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