Ultrabroadband Saline-Based Metamaterial Absorber With Near Theoretical Absorption Bandwidth Limit

Wen, Jingda; Ren, Qiang; Peng, Ruiguang; Zhao, Qian

doi:10.1109/lawp.2022.3169467

Cited by 22 publications

(8 citation statements)

References 38 publications

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“…where T r , T a , and T o are the temperature measured by the thermal imaging camera (46.5 • C), the ambient temperature (25 where λL is the maximum working wavelength. FOM = c△f t fL f0 [19], where c is speed of light; t is the thickness of structure; △f, f L, f 0 are the bandwidth of absorption, the lowest frequency, and center frequency, respectively. [28,29,[35][36][37][38].…”

Section: Resultsmentioning

confidence: 99%

“…Metamaterial absorbers [15][16][17], in particular, have attracted a great deal of attention due to their perfect wave absorption, which can be utilized for radar stealth as well as other functions. To achieve ultra-broadband radar absorption, it can be achieved by metamaterial absorber by combining multilayer structures [18][19][20], water [21][22][23], loading [24], resistive films [25], and so on. To achieve infrared stealth, frequency selective surface (FSS) with high metal fill rate can be used.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An optically transparent flexible metasurface absorber with broadband radar absorption and low infrared emissivity

Jing¹,

Wei²,

Kang³

et al. 2023

J. Phys. D: Appl. Phys.

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The rapid development of surveillance technology has driven the research of multispectral stealth. Demand for infrared and microwave radar compatible stealth is becoming increasingly urgent in military applications. Herein, a versatile metamaterial absorber is designed and fabricated to simultaneously achieve ultra-broadband radar scattering reduction, low infrared emission, and high optical transparency. The designed structure consists of an infrared stealth layer, radar absorption layers, and backing ground. The infrared stealth layer employs specifically indium tin oxide (ITO) square patches, while the radar absorption layers can be obtained by stacking different size ITO patterned films of the same structure with high surface resistances, realizing broadband microwave stealth performance in the 1.98 to 18.6 GHz frequency range with an incident angle of 45º. The broad radar stealth and low infrared emissivity of 0.283 are consistent with the simulations and calculations. Furthermore, the designed structure exhibits characteristics such as polarization insensitivity, wide incident angles, optical transparency, and flexibility, allowing for a wide range of applications in various environments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An optically transparent flexible metasurface absorber with broadband radar absorption and low infrared emissivity

Jing¹,

Wei²,

Kang³

et al. 2023

J. Phys. D: Appl. Phys.

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“…In order to realize a wider absorptive band, multilayer resistive screens were employed in the Jaumann absorber [4]. For further improvement of the operating bandwidth, different materials were introduced into absorber designs [5]- [12]. The ferrite backed with a conducting plate in [5] is applied to design a perfect absorber at the operating frequency.…”

Section: Introductionmentioning

confidence: 99%

“…Using sustainable waste biomass, a simple and economical structural absorber was presented in [11] with enhanced absorption performance. In [12], an all-dielectric ultra-wideband absorber was realized using a resin shell and saline structure.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wideband 3-D Microwave Absorbers With Composite Slotlines and Microstrip Lines: Synthetic Design and Implementation

Zhu

2023

IEEE Open J. Antennas Propag.

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This article proposes a class of ultra-wideband 3-D microwave absorbers with composite slotlines and microstrip lines from synthetic design to practical implementation. Firstly, the general equivalent transmission line (TL) model of the proposed 3-D absorber element is formed based on two sets of shunt short-ended stubs and an i-section nonuniform connecting line. Then, the synthetic procedure is theoretically investigated using the equivalent TL model, aiming to construct an ultra-wide absorption band with the Chebyshev equal-ripple response. According to the prescribed absorptive performance, such as maximum reflection coefficient (Г) and fractional bandwidth (FBW), the relevant parameters of the TL model can be directly calculated by the established synthesis approach. To validate the proposed concept, two prototypes, namely, absorber-I (i=1) and absorber-II (i=2), are designed, fabricated, and measured. Each prototype element applies a simple 3-D structure composed of slotlines, microstrip lines, and only one absorptive load, which are all etched on a single-layered substrate. Measured results agree well with synthetizations and simulations. For absorber-I, the measured bandwidth of 95.5% in a frequency range from 5.08 to 14.44GHz is successfully realized. Absorber-II obtains a measured FBW of 111.1% in a range from 4.48 to 15.68GHz. Average absorption ratios within the operating band are higher than 95.5% and 93.8% for absorber-I and absorber-II, respectively. Besides, the proposed 3-D absorbers are angularly stable within 60° oblique incidence. Therefore, such ultra-wideband 3-D microwave absorbers with simple structures possess the attractive potential for effectively absorbing electromagnetic waves.INDEX TERMS 3-D microwave absorber, equivalent transmission line model, synthetic design, ultrawideband absorber.

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“…Water, as a sort of eco-friendly nature resource, possesses good optical transparency. At the same time, water has fluidity at liquid phase, so it can move and has no definite shape, which makes it possible to act as a flexible medium in designing reconfigurable devices [23][24][25][26][27][28]. Besides, owing to its frequency dispersion and large dielectric losses properties, water can be utilized as a kind of dielectric material to realize waterbased absorbers with efficient and broadband absorbing features [29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Transparent and broadband switchable absorber/reflector based on structured water medium

Li¹,

Feng²,

Yuan³

et al. 2022

J. Phys. D: Appl. Phys.

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A reconfigurable absorber/reflector, which has optical transparency and broadband switching function, is developed based on structured water medium. The conductive indium tin oxide (ITO) coating is deposited on a thin polyethylene terephthalate (PET) film to act as the reflective backplane. Pure water is encapsulated by polydimethylsiloxane (PDMS) materials to construct structured water. The average optical transmittance is about 61.88%/56.44% in the visible spectrum of 380 – 760 nm with/without pure water. Based on the super-element configuration and the stacking technique, an obvious switching function from broadband absorption (12.47 – 28.43 GHz) to broadband reflection (12 – 30 GHz) can be attained under normal incidence through the injection and discharge of pure water,. Besides, the broadband switchable characteristics of the proposed structure remain effective for TE and TM modes when illuminated by oblique incident waves up to 45°. Moreover, the proposed switchable absorber/reflector shows good temperature stability and can work under different liquid temperatures. Furthermore, the excellent performance of the proposed design is demonstrated by both simulated and experimental results, exhibiting great potential as transparent smart windows in large-scale ground-based stealth systems.

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Ultrabroadband Saline-Based Metamaterial Absorber With Near Theoretical Absorption Bandwidth Limit

Cited by 22 publications

References 38 publications

An optically transparent flexible metasurface absorber with broadband radar absorption and low infrared emissivity

An optically transparent flexible metasurface absorber with broadband radar absorption and low infrared emissivity

Ultra-Wideband 3-D Microwave Absorbers With Composite Slotlines and Microstrip Lines: Synthetic Design and Implementation

Transparent and broadband switchable absorber/reflector based on structured water medium

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