Ultra-wideband microwave absorber based on multilayer patterned resistive film

• Published in: Materials research bulletin 2024-08, Vol.176, p.112794, Article 112794
• Main Authors: Chen, Hao, Xing, Bei-Bei, Liu, Zhen-Guo, Wang, Ning-Lin, Zhang, Qing-Dong, Liu, Xiao-Chun, Lu, Wei-Bing
• Format: Article
• Language: English
• Subjects: Absorber; Patterned resistive film; Ultra-wideband
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2024.112794

•The absorptivity of the proposed original absorber can achieve 90% in a wide bandwidth from 2.41 GHz to 18 GHz at normal incidence.•This original design is further extended to enhance absorption performance and angular stability, the absorptivity of over 90% can be achieved from 0.6 to 18 GHz in transverse magnetic (TM)-incident cases even if the incident angle goes up to 60°, corresponding to a relative bandwidth of 153%.•The proposed absorber has the largest relative bandwidth with better angular stability as compared to the previously reported wideband absorbers. In this work, two ultra-wideband microwave absorbers are proposed. The absorptivity of the proposed original absorber can achieve 90% in a wide bandwidth from 2.41 GHz to 18 GHz at normal incidence. This design has been extended to enhance absorption performance and angular stability by respectively incorporating a high-dielectric substrate and adding metal vias. As a result, the absorptivity of over 90% can be achieved from 0.6 to 18 GHz in transverse magnetic (TM)-incident cases even if the incident angle goes up to 60°, which realizes a relative bandwidth of 153%. While in the transverse electrical (TE) polarization, the absorption of the new absorber performs better than the original one in the entire operational bandwidth. A prototype of the proposed absorber is fabricated and measured, good agreement is obtained between measured and simulated results, indicating the usability of our design in practical electromagnetic wave absorbing scenes. [Display omitted]