Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 128, Issue 10, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-022-05994-z
Keywords
Broadband; Metamaterials; Microwave absorber; Water
Funding
- National Natural Science Foundation of China [52172099]
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In this study, a water-based metamaterial absorber with ultra-broadband absorption characteristics and high absorptivity is designed and investigated. The absorber achieves an absorption rate of over 90% and a relative bandwidth of up to 130.4% at a thickness of 3.8 mm. The multi-peak resonance characteristic of the absorption spectra is closely related to the shape of the water unit cells. Additionally, the absorber shows temperature insensitivity and broad absorption characteristics at wide incidence angles.
Water-based metamaterial microwave absorbers have been proposed recently due to their potential for versatility such as optically transparence and flexibility. In this study, a sandwiched metamaterial absorber with cross-connect water rings is designed, which achieves an absorptivity of more than 90% in the ultra-broadband from 7.74 to 36.76 GHz, and the relative bandwidth can reach as high as 130.4% with a thickness of 3.8 mm. The multi-peak resonance characteristic of the absorption spectra of the proposed absorber is discussed in 6-40 GHz, and the strong resonance absorption is believed to be highly correlated to shape of the designed water unit cells. The impedance matching as well as the lossy mechanism is discussed based on the permittivity of water and periodic unit cells. Additionally, the proposed absorber shows a comprehensive performance with temperature insensitivity and broad absorption characteristics at wide incidence angles. Therefore, the proposed water-based metamaterial absorber shows excellent absorption performance while greatly reduces the difficulty of its preparation and implementation, which could be applied in a wider range of applications for different scenarios.
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