Journal
ADVANCED SCIENCE
Volume 9, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/advs.202105553
Keywords
dielectric loss; electromagnetic wave absorption; mechanism
Categories
Funding
- National Science Foundation of China [51872238, 21806129, 52074227]
- Fundamental Research Funds for the Central Universities [3102018zy045, 3102019AX11]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JM-118, 2017JQ5116]
- Analytical & Testing Center of Northwestern Polytechnical University
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Comprehensive views on dielectric loss mechanisms provide important guidance for understanding the attenuation behavior of materials. Current researches focus more on materials synthesis rather than in-depth mechanism study. Therefore, further research on in-depth mechanisms, emphasis on new dielectric loss mechanisms, and new modulation strategies are needed to achieve simple and effective EM wave attenuation behavior modulation.
Electromagnetic (EM) wave absorbing materials play an increasingly important role in modern society for their multi-functional in military stealth and incoming 5G smart era. Dielectric loss EM wave absorbers and underlying loss mechanism investigation are of great significance to unveil EM wave attenuation behaviors of materials and guide novel dielectric loss materials design. However, current researches focus more on materials synthesis rather than in-depth mechanism study. Herein, comprehensive views toward dielectric loss mechanisms including interfacial polarization, dipolar polarization, conductive loss, and defect-induced polarization are provided. Particularly, some misunderstandings and ambiguous concepts for each mechanism are highlighted. Besides, in-depth dielectric loss study and novel dielectric loss mechanisms are emphasized. Moreover, new dielectric loss mechanism regulation strategies instead of regular components compositing are summarized to provide inspiring thoughts toward simple and effective EM wave attenuation behavior modulation.
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