Optically Transparent Single‐Layer Frequency‐Selective Surface Absorber for Dual‐Band Millimeter‐Wave Absorption and Low‐Infrared Emissivity

Han, Kiwook; Shim, Hyeon Bo; Hahn, Jae Won

doi:10.1002/adpr.202200009

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…ITO films exhibit transparency in the visible range, and their effective relative permittivity in the IR band can be accurately described using the Drude model. [37,[38][39][40]…”

Section: Design Of Ral and Irslmentioning

confidence: 99%

Visible Transparent Wideband Microwave Meta‐Absorber with Designable Digital Infrared Camouflage

Cui,

Wang,

Sun

et al. 2023

Advanced Optical Materials

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Stealth performance plays an increasingly important role in the evaluation of aircraft performance, while achieving excellent stealth performance in multiple frequency bands simultaneously remains a crucial challenge. Herein, a visible transparent wideband microwave absorber with infrared camouflage function is theoretically presented and experimentally demonstrated. The sample is composed of two radar absorption layers (RALs) and an infrared shielding layer (IRSL). In addition, the magnetic resonance model and the ohmic loss model are employed to strengthen the absorption of the designed RALs >90% in a broadband frequency range of 7–23 GHz with a relative bandwidth of 106.7%, and an average visible transmittance of ≈60%. Furthermore, IRSL is achieved by a designable digital frequency selective surface (FSS), which promotes a compatible design between infrared camouflaged emissivity and microwave absorption. These peculiar properties not only verify the feasibility of the proposed strategy for achieving suitable artificially designed IR digital camouflage patterns to meet various thermal camouflage environments, but also have promising application prospects in multispectral stealth. The additional visible light transparent feature makes it useful in compatible camouflage‐stealth facilities when requiring observing and operating in optical windows.

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“…ITO films exhibit transparency in the visible range, and their effective relative permittivity in the IR band can be accurately described using the Drude model. [37,[38][39][40]…”

Section: Design Of Ral and Irslmentioning

confidence: 99%

Visible Transparent Wideband Microwave Meta‐Absorber with Designable Digital Infrared Camouflage

Cui,

Wang,

Sun

et al. 2023

Advanced Optical Materials

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“…In addition, the absorption bandwidth of these composites is usually narrow, and the fabrication process is relatively complicated. A more commonly used approach to realizing radar-IR bi-stealth is to cover radar-absorbing materials with low-IR-reflectivity material, such as metal thin films and nanocomposites [9][10][11][12]. However, while radar stealth materials require high absorption and low reflectivity, IR stealth materials require low absorption and high reflectivity, which makes compatible designs very difficult.…”

Section: Introductionmentioning

confidence: 99%

An Optically Transparent Metamaterial Absorber with Tunable Absorption Bandwidth and Low Infrared Emissivity

Chang,

Ji,

et al. 2023

Materials

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A transparent metamaterial absorber (MMA) with both tunable absorption bandwidth and low infrared (IR) emissivity is proposed in this paper. The MMA is hierarchical, which consists of an infrared shielding layer (IRSL), two radar-absorption layers (RALs), an air/water layer, and an indium–tin–oxide (ITO) backplane from the top downwards. The IRSL and the RALs are made of ITO patterns etched on polyethylene terephthalate (PET) substrates. By changing the thickness of the water, the 90% absorption bandwidth can be tuned from 6.4–11.3 GHz to 12.7–20.6 GHz, while retaining good polarization and angular stability. An equivalent circuit model (ECM) is present, to reveal the physical mechanism of absorption. The proposed MMA has a low theoretical IR emissivity of about 0.24. A sample was fabricated and measured, and the experimental results are consistent with the simulation results, showing its potential applications in stealth glass and multifunctional radome.

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“…Various methods have emerged through technological advancements which enhance microwave imaging capabilities. These include scanning-probe microscopes 16 – 19 , metamaterial absorbers 20 , and metasurface-based sensors 21 . Scanning-probe microscopes involve moving a probe along the sample surface and detecting the interaction between the sample and the radio-frequency (RF) field 22 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of interaction phenomena of electromagnetic waves with metamaterials via microwave near-field visualization technique

Baghdasaryan,

Babajanyan,

Friedman

et al. 2023

Sci Rep

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A new practical imaging technique was presented for metamaterial characterization and investigation by visualizations of the magnetic microwave near-field (H-MWNF) distributions on a metamaterial's surface using the method of thermo-elastic optical indicator microscopy (TEOIM). ITO-based transparent and ceramic-based opaque metamaterial structures were designed for magnetic near-field visualization. Depending on the incident microwave field polarization, the TEOIM system allows the characterization of the metamaterial properties and microwave interaction behavior. The working principle of the periodic structures was investigated through numerical simulations, and the obtained results exhibited strong agreement when compared with experimental observations. Moreover, the visualization of the H-MWNF revealed the potential to characterize and evaluate the absorption and transmission properties effectively.

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Optically Transparent Single‐Layer Frequency‐Selective Surface Absorber for Dual‐Band Millimeter‐Wave Absorption and Low‐Infrared Emissivity

Cited by 7 publications

References 39 publications

Visible Transparent Wideband Microwave Meta‐Absorber with Designable Digital Infrared Camouflage

Visible Transparent Wideband Microwave Meta‐Absorber with Designable Digital Infrared Camouflage

An Optically Transparent Metamaterial Absorber with Tunable Absorption Bandwidth and Low Infrared Emissivity

Characterization of interaction phenomena of electromagnetic waves with metamaterials via microwave near-field visualization technique

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