Excellent microwave absorbing performance of the sandwich structure absorber Fe@B2O3/MoS2/Fe@B2O3 in the Ku-band and X-band

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 382; p. 122804
• Main Authors: Wang, Peng, Wang, Guowu, Zhang, Junming, Duan, Benfang, Zheng, Lihan, Zhang, Sha, He, Donglin, Wang, Tao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.02.2020
• Subjects: EM wave absorption; Permeability; Permittivity; Sandwich-structure; Permeability; Sandwich-structure; Permittivity; EM wave absorption
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2019.122804

[Display omitted] •A sandwich-structure absorber is designed.•The effective bandwidth reaches 7 GHz.•The RLmin reaches −35.9 dB.•The absorber thickness is only 1.9 mm. In this paper, we present the design of a thin triple-layer sandwich-structure absorber (SSA) based on the composites of polyurethane (PU) with different mass filler fraction of the core–shell Fe@B2O3 nanoparticles and MoS2 microflowers for achieving a broadband absorption of EM waves. The absorbing performance of the proposed SSA is calculated using the EM parameters of the single-layer absorbers (SLA) prepared by the Fe@B2O3/PU and MoS2/PU composites. For designing the SSA, we optimized the thickness of each SLA first by studying the EM absorption characteristics of each layer. Here, we present the design of two SSAs: SSA–1 and SSA–2. Their calculated effective bandwidths reach 4.1 GHz (8.2–12.3 GHz) with a total thickness of 2.1 mm and 7.0 GHz (10.9–17.9 GHz) with a total thickness of 1.9 mm, respectively. Meanwhile, we fabricated the SSA-2 sample experimentally by hot-pressing the SLA. The reflection loss curve of the prepared sample was measured by the short-circuit method. The measured effective bandwidth (7.6 GHz) is in basically agreement with the calculated value (7.0 GHz), demonstrating the credibility of the proposed SSA design for its applications in the X-band or the Ku-band.