气候变化领域集成服务门户(CCPortal): Conceptual-based design of an ultrabroadband microwave metamaterial absorber

CCPortal

DOI	10.1073/pnas.2110490118
	Conceptual-based design of an ultrabroadband microwave metamaterial absorber
	Qu S.; Hou Y.; Sheng P.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:36
英文摘要	By introducing metallic ring structural dipole resonances in the microwave regime, we have designed and realized a metamaterial absorber with hierarchical structures that can display an averaged −19.4 dB reflection loss (∼99% absorption) from 3 to 40 GHz. The measured performance is independent of the polarizations of the incident wave at normal incidence, while absorption at oblique incidence remains considerably effective up to 45°. We provide a conceptual basis for our absorber design based on the capacitive-coupled electrical dipole resonances in the lateral plane, coupled to the standing wave along the incident wave direction. To realize broadband impedance matching, resistive dissipation of the metallic ring is optimally tuned by using the approach of dispersion engineering. To further extend the absorption spectrum to an ultrabroadband range, we employ a double-layer self-similar structure in conjunction with the absorption of the diffracted waves at the higher end of the frequency spectrum. The overall thickness of the final sample is 14.2 mm, only 5% over the theoretical minimum thickness dictated by the causality limit. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Dipole resonances; Hierarchical structures; High-impedance resonances; Metamaterials; Microwave absorption
语种	英语
scopus关键词	absorption spectroscopy; article; dipole; impedance; microwave radiation; theoretical study; thickness
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238402
作者单位	Department of Physics, Hong Kong University of Science and Technology, Hong Kong
推荐引用方式 GB/T 7714	Qu S.,Hou Y.,Sheng P.. Conceptual-based design of an ultrabroadband microwave metamaterial absorber[J],2021,118(36).
APA	Qu S.,Hou Y.,&Sheng P..(2021).Conceptual-based design of an ultrabroadband microwave metamaterial absorber.Proceedings of the National Academy of Sciences of the United States of America,118(36).
MLA	Qu S.,et al."Conceptual-based design of an ultrabroadband microwave metamaterial absorber".Proceedings of the National Academy of Sciences of the United States of America 118.36(2021).