Open AccessConceptual-based design of an ultrabroadband microwave metamaterial absorber
Author(s) -
Sichao Qu,
Yuxiao Hou,
Ping Sheng
Publication year - 2021
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.2110490118
Subject(s) - microwave , metamaterial , impedance matching , absorption (acoustics) , resonance (particle physics) , metamaterial absorber , optics , conceptual design , electrical impedance , bandwidth (computing) , dipole , diffraction , physics , materials science , computer science , telecommunications , tunable metamaterials , atomic physics , quantum mechanics , human–computer interaction
Significance While microwave absorption is a widely pursued topic, a conceptual-based design can offer a theoretical basis for generalization and improvements. We offer a design recipe for ultrabroadband absorption based on the use of electrical dipole resonance in a metallic ring to generate, via interaction with its image resonance, two high-impedance resonances. Impedance matching over the frequency range in between the two resonances is obtained by adding resistance to the metallic ring. To extend the absorption to an ultrabroadband spectrum, we employ a double-layer self-similar structure in conjunction with absorption of the diffracted waves at the higher frequency end. The resulting absorber pushes the overall performance close to the causality limit over a large absorption bandwidth.