A low-cost digital coding metasurface applying modified ‘crusades-like’ cell topologies for broadband RCS reduction

Wang, Chao; Wang, Ru‐Zhi; An, Ze-Lin; Liu, Liying; Zhou, Yuan; Tang, Zhixiang; Wang, Weidong; Zhang, Shengjun

doi:10.1088/1361-6463/ac9539

Cited by 6 publications

(3 citation statements)

References 40 publications

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“…Therefore, we assume Z C to be equal to Z 0 . Both Z A and Z B are complex impedances which can be expressed by [41].…”

Section: Equivalent Circuit Of the Fsrmentioning

confidence: 99%

Frequency selective rasorber based on cross bend resonators for wideband transmission and absorption

Li,

Wang,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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The wideband absorption and transmission of frequency-selective rasorber (FSR) remain a persistent challenge in the application of radar devices. In this article, a novel high performance wideband FSR design based on cross bend resonators (CBR) was proposed. The FSR consists of an upper absorption lossy layer, which offers broad absorption and transmission bands, and a lower bandpass frequency-selective surface (FSS) that enables a highly selective transmission of incident electromagnetic wave. Full wave simulation results showed that this novel design achieves an absorption bandwidth of 83.7% with more than 90% absorptivity in the frequency range of 5.2-12.7 GHz. Furthermore, the passband's fractional bandwidth (FBW) for the insertion loss (IL) less than -3 dB is 33.9%, ranging from 14.9 to 21 GHz, with the minimum IL recorded at 0.69 dB at 17.7 GHz. To further verify the proposed method, a prototype FSR with 10×10 units of 120 mm×120 mm was fabricated and the performance of the FSR was tested. The experiment results were in good agreement with the simulated results, and it showed a significant monostatic radar cross-section (RCS) reduction in the frequency range of 5.3 GHz to 18.3 GHz compared with a metallic plane of the same size.

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“…Therefore, we assume Z C to be equal to Z 0 . Both Z A and Z B are complex impedances which can be expressed by [41].…”

Section: Equivalent Circuit Of the Fsrmentioning

confidence: 99%

Frequency selective rasorber based on cross bend resonators for wideband transmission and absorption

Li,

Wang,

Wang

et al. 2024

J. Phys. D: Appl. Phys.

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“…在一些非周期的超材料设计中, 研究者利用优化算法与阵列理论相结合, 通过不断调节超材料阵列中单元相位排布来搜索最优解, 并成功地实现了预期的散射效果 [24,25] . 在这个过程中, 由于时域求解 [26] .…”

Section: 遗传算法模型unclassified

Design of broadband gradient resistive film metamaterial absorber based on genetic algorithm

Wang,

Li,

Zhang

et al. 2024

Acta Phys. Sin.

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In recent years, electromagnetic (EM) wave absorbing devices based on metamaterials have attracted widespread attention from researchers around the world, due to their advantages such as broadband, easy preparation and flexibility to tailor EM waves. Nevertheless, a review of the existing research reveals that the inherent sub-wavelength characteristics of metamaterials and metasurfaces impose certain constraints on their use in low-frequency ranges. In order to achieve low detectability that takes into account both low-frequency and broadband absorbing performance, this paper presents a metamaterial absorber based on 5-layer gradient resistance film and dielectric composite structure, as shown in FIG.1 (a). To begin, we introduce the structural design of the initial element, and based on this, the transmission line theory and impedance matching principle are applied to analyze the strong wave absorption conditions of the absorber element. In terms of the element structure optimization, the genetic algorithm is adopted to globally search for the optimal solution in the multi-variable domain, resulting in the rapid determination of metamaterial elements’ configurations and resistance parameters that meet the design goals. In the simulation, the wave absorption performance and mechanism of the designed absorbing element are also conducted in an in-depth manner. Simulation results show that the designed metamaterial absorber can achieve more than 90% EM wave absorption in the frequency range of 1.62- 19.16 GHz (with a relative bandwidth of 168.8%) under normal incidence of linearly polarized plane waves, which effectively expanding the absorption bandwidth to the L and K bands. In addition, the simulations for oblique incidence at different polarization provide strong evidence for the device's insensitivity to both polarization and angle. The radar cross section (RCS) curves obtained by the time domain (TD) simulation illustrate that, the novel structure can achieve more than 10 dB RCS reduction over the frequency range of 1.7- 20 GHz. During the device's performance verification process, a metamaterial absorber with 20 × 20 elements and dimensions of 1.566λl×1.566λl ×0.113λl is fabricated and tested using the bow method reflectivity test system. The absorptivity curves under 5° oblique incidence of different polarizations, as depicted in FIG.1 (b), show that, the proposed metamaterial absorber can realize more than 80% EM absorption over the entire frequency range from 2 to 18 GHz, the test results of different polarizations are basically consistent. The test results at oblique incidence (θ ≥ 30°) show that, despite the measured and simulated curves exhibit discrepancies in certain frequency bands due to human error or material dispersion characteristics, the overall outcomes of the experiment are consistent with our expectations, which fully proves that the designed metamaterial absorber has potential application value in the field of low-frequency and broadband EM absorption.

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“…The author in [16] proposed an encoded metasurface based on the FitzHugh-Nagumo spatiotemporal chaos model, employing a "quantization-coding" method combined with Type-I unit cells designed according to the Pancharatnam-Berry phase, aimed at significantly reducing the radar cross section (RCS) and offering a new strategy for stealth technology. Wang et al introduced a binary digital coding metasurface based on a low-cost FR4 substrate, utilizing innovative 'crusadeslike' cell topologies, to achieve broadband RCS reduction [17]. Furthermore, in [18], the author utilized a wideband metasurface based on polarization conversion operations to achieve RCS reduction of an isolated multi-input multi-output antenna through destructive interference of scattered EM waves from both sides of the designed metasurface.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Information Metasurface-Assisted Target Jamming System for Synthetic Aperture Radar

Li,

Liu

et al. 2024

Remote Sensing

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In recent years, jamming strategies for Synthetic Aperture Radar (SAR) pertaining to target detection and identification, such as the creation of false targets, electromagnetic (EM) deception, and signal spoofing, have been increasingly emphasized. Distinct from traditional SAR jamming approaches, the introduction of an innovative artificial material cloak in SAR target jamming presents augmented capabilities. These methods demonstrate a proficient redirection of incident EM waves in specific or arbitrary directions, effectively masking the vital information linked to critical targets. This study introduces a broadband SAR target jamming system employing an information metasurface that incorporates intelligent information processing algorithms in conjunction with a space-time-coding digital metasurface, endowing it with the capacity to adeptly modulate incident EM waves. This integration facilitates a versatile approach to jamming, enabling the deployment of multi-mode protective measures against critical targets. The conducted simulation and experiment results validate the system’s ability to adjustably produce EM deception and generate multiple false targets independently of the SAR system. The outcomes of this research significantly advance the practicality of SAR protection strategies, pushing the boundaries toward more dynamic, broadband, and controllable scenarios, thereby substantially improving the concealment of critical targets in highly sensitive conflict areas.

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A low-cost digital coding metasurface applying modified ‘crusades-like’ cell topologies for broadband RCS reduction

Cited by 6 publications

References 40 publications

Frequency selective rasorber based on cross bend resonators for wideband transmission and absorption

Frequency selective rasorber based on cross bend resonators for wideband transmission and absorption

Design of broadband gradient resistive film metamaterial absorber based on genetic algorithm

A Broadband Information Metasurface-Assisted Target Jamming System for Synthetic Aperture Radar

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