Design of a Tunable Absorber Based on Active Frequency-Selective Surface for UHF Applications

Qi, Kainan; Li, Liangsheng; Su, Jianxun; Liu, Yongqiang; Chen, Junwen

doi:10.3390/ma12233989

Cited by 9 publications

(5 citation statements)

References 40 publications

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“…The author validated the performance under normal incidence, and it is proved that this structure realizes a wideband absorption from 0.7 to 1.9 GHz with a reflection coefficient below −10 dB at bias voltages from 10 to 48 V. However, this work is devised for single polarization. Another tunable absorber designed for the UHF band was proposed in [35]. This absorber obtains an absorption band from 0.415 to 0.822 GHz by tuning the bias voltage from 0 to 30 V.…”

Section: Introductionmentioning

confidence: 99%

Ultrawideband lightweight absorber based on composite strategy with active control of absorption in the UHF band

Zhao

Jiang

Yang

et al. 2023

J. Phys. D: Appl. Phys.

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In this paper, a composite strategy has been developed to achieve continuous absorption coverage from the ultrahigh-frequency (UHF) band up to the Ku band. Based on this strategy, an ultrawideband (UWB) lightweight composite metamaterial absorber is fabricated and measured. The composite absorber comprises two cascaded parts operating in separated frequency bands. First, we design a polarization-insensitive tunable absorber in the UHF band based on the equivalent circuit model (ECM). The measured results indicate that the tunable UHF absorber obtains a tunable -10 dB reflection coefficient from 0.88 to 1.48 GHz. Furthermore, a lightweight 3D absorber is applied to cascade with the tunable UHF absorber to constitute a UWB composite absorber. The composite absorber achieves an ultrawideband absorption ranging from 0.78 to 18 GHz with a reflection coefficient below -10 dB. The overall composite structure is extremely lightweight with a surface density below 0.2897 g/cm2. This composite absorber also exhibits good angular stability, low profile, and polarization insensitiveness. We think this work is of great application potential for military and civilian applications.

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Section: Introductionmentioning

confidence: 99%

Ultrawideband lightweight absorber based on composite strategy with active control of absorption in the UHF band

Zhao

Jiang

Yang

et al. 2023

J. Phys. D: Appl. Phys.

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“…polarization converters [10][11][12][13], absorbers [14][15][16][17], antennas [18][19][20][21] and radomes [20,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Intelligent electromagnetic mapping via physics driven and neural networks on frequency selective surfaces

Miao

Zhang

Zhou

et al. 2023

J. Phys. D: Appl. Phys.

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The high mapping efficiency between various structures and electromagnetic (EM) properties on frequency selective surfaces (FSSs) is the state-of-the-art in EM community. The most straightforward approaches for beams analysis depend on the measurements and conventional EM calculation methods, which are inefficient and time-consuming. Equivalent circuit model (ECM) with excellent intuitiveness and simplicity is put forward extensively. Despite of several applications, the bottlenecks of ECM still exist, i.e., the application scope is restricted in narrow band and specific structure, which is triggered by the ignorance of EM nonlinear coupling. In this work, a lightweight physic model based on neural network (ECM-NN) is proposed for the first time, which exhibits a great physical interpretability and spatial generalization ability. The nonlinear mapping relationship between structures and beams behaviors is interpreted by corresponding simulations. Specially, two deep parametric factors obtained by multi-layer perceptron (MLP) network are introduced to serve as the core of lightweight strategy and compensate for the absence of nonlinearity. Experimental results of single square loop (SL) and double SL indicate that compared with related works, better agreements of the frequency responses and resonant frequencies are achieved by ECM-NN in broadband (0-30 GHz) as well as oblique incident angles (0-60°). The average accuracy of mapping is higher than 98.6%. The discoveries of this work provide a novel strategy for further studies of complex FSSs.

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“…Tunable broadband absorber can be widely used in thermal radiation [ 7 ] detection and terahertz stealth [ 8 , 9 ]. The increasingly complex electromagnetic application environment needs active tunable electromagnetic metamaterial absorber with the change of different active demands [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Ultrawideband Terahertz Absorber with Dielectric Cylinders Loaded Patterned Graphene Structure

Liu

2021

Materials

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In this paper, we theoretically designed and numerically analyzed an ultrabroadband meta-absorber with near unity absorptivity that works in terahertz spectrum. A wideband meta-absorber composed of bilayer patterned graphene and dielectric cylinder array with high symmetry was proposed. The wideband absorption mechanism benefited from two aspects. The first one was enhanced surface plasmons based on bilayer patterned graphene. And the second one was the coupling of continuous resonant modes within Fabry-Perot cavities to the enhanced surface plasmons in the graphene. An ultrawide bandwidth with absorptivity over 90% were obtained from 3.2 THz to 9.4 THz. Simulated results showed that the proposed ultra-wideband absorbing structure also possessed high performance of polarization independence, flexible tunability, large incident angle insensitivity, and compact fabrication.

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Design of a Tunable Absorber Based on Active Frequency-Selective Surface for UHF Applications

Cited by 9 publications

References 40 publications

Ultrawideband lightweight absorber based on composite strategy with active control of absorption in the UHF band

Ultrawideband lightweight absorber based on composite strategy with active control of absorption in the UHF band

Intelligent electromagnetic mapping via physics driven and neural networks on frequency selective surfaces

Ultrawideband Terahertz Absorber with Dielectric Cylinders Loaded Patterned Graphene Structure

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