Multi-scale design of electromagnetic composite metamaterials for broadband microwave absorption

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.

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“…3 C ). In fact, other carbon-based materials ( 51 – 54 ) also exhibit similar excellent absorption capabilities at higher frequencies.…”

Section: Resultsmentioning

confidence: 96%

Conceptual-based design of an ultrabroadband microwave metamaterial absorber

Hou

Sheng

2021

Proc. Natl. Acad. Sci. U.S.A.

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“…c is the speed of electromagnetic waves in vacuum condition, d is the thickness of absorbers and f represents the frequency. 55 The RL value <−10 dB is generally selected as the criterion for effective absorption, which means > 90% electromagnetic wave was absorbed.…”

Section: Resultsmentioning

confidence: 99%

Enhanced microwave absorption performance of light weight N-doped carbon nanoparticles

et al. 2021

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“…As the continuous increase of tip configuration (b is equal to 6 and 7), the power loss decreases accordingly. The reason can be explained as follows: 3D periodically arranged honeycombs in the proposed absorber increase the resonant peak number by means of generating standing wave in more broadened frequency range, thus tailoring the complex permittivity and complex permeability of the whole structure to improve impedance matching features [29]. Meanwhile, incident microwaves would go through more reflections and scatterings among the honeycomb interfaces with the increasing tip height, which can be proved by the clearer power loss distribution at both the edges and Figure 3 Simulated reflectivity spectra of the designed arrays with different geometry parameters as marked (a).…”

Section: (D)mentioning

confidence: 99%

From intrinsic dielectric loss to geometry patterns: Dual-principles strategy for ultrabroad band microwave absorption

et al. 2020

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As electromagnetic absorbers with wide absorption bandwidth are highly pursued in the cutting-edge electronic and telecommunication industries, the traditional dielectric or magnetic bulky absorbers remain concerns of extending the effective absorption bandwidth. In this work, a dual-principle strategy has been proposed to make a better understanding of the impact of utilizing conductive absorption fillers coupled with implementing artificial structures design on the absorption performance. In the comparison based on the microscopic studies, the carbon nanotubes (CNTs)-based absorbers are confined to narrow operating bandwidth and relatively fixed response frequency range, which can not fulfill the ever-growing demands in the application. With subsequent macroscopic structure design based on the CNTs-based dielectric fillers, the artificial patterns show much more broadened absorption bandwidth, covering the majority of C-band, the whole X-band, and Ku-band, due to the tailored electromagnetic parameters and more reflections and scatterings. The results suggest that the combination of developing microscopic powder/bulky absorbers and macroscopic configuration design will fundamentally extend the effective operating bandwidth of microwave.

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Multi-scale design of electromagnetic composite metamaterials for broadband microwave absorption

Cited by 150 publications

References 51 publications

Conceptual-based design of an ultrabroadband microwave metamaterial absorber

Conceptual-based design of an ultrabroadband microwave metamaterial absorber

Enhanced microwave absorption performance of light weight N-doped carbon nanoparticles

From intrinsic dielectric loss to geometry patterns: Dual-principles strategy for ultrabroad band microwave absorption

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