Dispersion-Engineered, Broadband, Wide-Angle, Polarization-Independent Microwave Metamaterial Absorber

Shi, Ting; Jin, Lei; Han, Lei; Tang, Ming‐Chun; Xu, He‐Xiu; Qiu, Cheng‐Wei

doi:10.1109/tap.2020.3001673

Cited by 88 publications

(24 citation statements)

References 39 publications

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“…The large-angle MWAP is an important index of absorbing materials for anechoic chambers, and the quality of large-angle absorbing materials also has a great influence on the use of absorbing materials. , According to the electromagnetic field theory, the reflection coefficient (Γ) of a nonmagnetic medium can be expressed as normalΓ = cos nobreak0em.25em⁡ θ i − ε 2 / ε 1 − sin 2 ⁡ θ i cos nobreak0em.25em⁡ 0.25em θ i + ε 2 / ε 1 − sin 2 ⁡ θ i R L = 20 l o g | Γ | where θ i is the angle between the incident wave and the normal of the material surface, ε 1 is the dielectric constant of medium 1, and ε 2 is the dielectric constant of medium 2.…”

Section: Resultsmentioning

confidence: 99%

Broadband and High-Efficiency Microwave Absorbers Based on Pyramid Structure

Sun

Zhang²,

et al. 2022

ACS Appl. Mater. Interfaces

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Microwave-absorbing materials with wide bandwidth and high absorptivity are increasingly playing an important role in overthe-air (OTA) testing. In this work, a kind of pyramid absorbing material was prepared using flame-retardant absorbers as the filler. In addition, a coating was used to further improve the flame-retardant properties of the microwave-absorbing material. To obtain excellent microwave absorption performance (MWAP), a high-frequency structure simulator (HFSS) was adopted to design structural materials. Here, the total height, the base height, the decapitation height of the pyramid tip, the distance between the pyramids, and other parameters were analyzed; then, the actual processing and molding were realized. The MWAP of −30 dB was achieved at 2.7−18 GHz, and the MWAP of −10 dB was also met at 2−18 GHz. In particular, the study also investigated the MWAP of large angle, which can meet the MWAP of −10 dB at 2−18 GHz and MWAP of −30 dB at 4−18 GHz. Most importantly, the absorption mechanism of the pyramid structure was explored. The influence of the tip was proved by the distribution of the electromagnetic field in the pyramid. It can be regarded as a multilayer microwave-absorbing material due to the impedance gradient of the pyramid, which can provide an effective research idea and method for future engineering applications.

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Section: Resultsmentioning

confidence: 99%

Broadband and High-Efficiency Microwave Absorbers Based on Pyramid Structure

Sun

Zhang²,

et al. 2022

ACS Appl. Mater. Interfaces

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“…To solve the earlier issues, researchers have developed several strategies to achieve absorbers with multiband, broadband, wide‐angle, polarization‐insensitive, and even tunable characteristics. [ 25–36 ] For example, fractal structure was involved in a triple‐band absorber design, leading to multiple local resonant circuits and thus contributing to near‐unity absorption for a wide range of incident angles under dual‐polarization states. [ 31 ]…”

Section: Introductionmentioning

confidence: 99%

“…To solve the earlier issues, researchers have developed several strategies to achieve absorbers with multiband, broadband, wide-angle, polarization-insensitive, and even tunable characteristics. [25][26][27][28][29][30][31][32][33][34][35][36] For example, fractal structure was involved in a tripleband absorber design, leading to multiple local resonant circuits and thus contributing to near-unity absorption for a wide range of incident angles under dual-polarization states. [31] To date, several approaches have been proposed to widen the operating bandwidth, including creating multiple resonances by introducing planar/vertical inclusions, [32][33][34][35][36] and lumped elements such as resistances, capacitances, and diodes.…”

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confidence: 99%

Multimode‐Assisted Broadband Impedance‐Gradient Thin Metamaterial Absorber

Wang

et al. 2022

Advanced Photonics Research

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In recent years, metamaterials have become a research hotspot and achieved significant progress in both military and civilian applications due to their great potential in control of amplitude, phase, and polarization of electromagnetic (EM) waves. It can be potentially applied in stealth technology, photonics, and wireless communications. [1][2][3][4][5][6][7][8][9][10][11] Metamaterial absorbers (MAs), the specialized functional devices for capturing and dissipating EM waves, have attracted extensive attention due to their wide range of applications in energy harvesting, EM compatibility, stealth technology, and sensors. [12][13][14][15][16][17][18] Since the first attempt with perfect absorption realized based on metamaterials, [19] the interested operation range of MAs has been extensively expanded from microwave, terahertz (THz), and infrared to visible light. [16][17][18][19][20][21][22][23][24] Nevertheless, the early attempt suffers from a series of drawbacks, such as narrowband, and polarizationand angle-sensitive performance, which significantly limit their real-world applications. To solve the earlier issues, researchers have developed several strategies to achieve absorbers with multiband, broadband, wide-angle, polarization-insensitive, and even tunable characteristics. [25][26][27][28][29][30][31][32][33][34][35][36] For example, fractal structure was involved in a tripleband absorber design, leading to multiple local resonant circuits and thus contributing to near-unity absorption for a wide range of incident angles under dual-polarization states. [31] To date, several approaches have been proposed to widen the operating bandwidth, including creating multiple resonances by introducing planar/vertical inclusions, [32][33][34][35][36] and lumped elements such as resistances, capacitances, and diodes. [37][38][39][40][41][42] However, there are still some issues remaining unaddressed. For planar structures with single-layer composite patterns, the design is extremely complicated, and the expansion of bandwidth is often limited. Moreover, previous multilayer absorbers always feature bulky and much larger volumes than the theoretical limit established by Rozanov for physically realizable absorbers. [43] As for the lumped approach, it is impossible for high-frequency operation or elegant miniaturization and leads to even more complexity. The advent of indium tin oxide (ITO) film provides an efficient solution to the earlier issues due to its resistance characteristics and wide commercial availability. Although most of absorbers based on ITO can achieve broad bandwidth by combining the approaches of introducing resistances and multilayer patterns with air spacer, they increase considerably the thickness of the absorber. [44][45][46][47][48] At present, it is still a great challenge to obtain broadband absorbers with a low profile that are desirable in specific applications.Here, we propose a multimode-assisted strategy to acquire a trilayer broadband MA with simple patterned ITO films in a

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“…Three‐dimensional structure has also become the focus of research. In Reference 14, the combination of plane structure and vertical structure into three‐dimensional cross grid array achieves 59.35% bandwidth and 0.091λ 𝐿 thickness. Although the above structures try to achieve minimum thickness, the contradiction between bandwidth and thickness is still a difficulty in designing MAs.…”

Section: Introductionmentioning

confidence: 99%

Design of a broadband ultra‐thin metamaterial absorber with G‐type bent structure

Wang

Ren

Xue

et al. 2022

Int J RF Mic Comp-Aid Eng

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A broadband ultra-thin metamaterial absorber (MA) with a multilayer structure is proposed. The G-type metal layer (GTML) and the square ring metal layer (SRML) are attached to the upper and lower surfaces of the dielectric substrate. Its bandwidth is determined by the high frequency resonant point f H0 and low frequency resonant point f L0 generated by GTML and SRML. The MA with unit size of 19 mm Â 19 mm Â 8.6 mm was simulated, manufactured and measured. The results show that the bandwidth of the structure can cover 2.89-8.06 GHz, and the relative bandwidth is 94.43%. Compared with other structures, the total thickness of the element is only 0.083λ L , where λ L is the wavelength at 2.89 GHz.

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Dispersion-Engineered, Broadband, Wide-Angle, Polarization-Independent Microwave Metamaterial Absorber

Cited by 88 publications

References 39 publications

Broadband and High-Efficiency Microwave Absorbers Based on Pyramid Structure

Broadband and High-Efficiency Microwave Absorbers Based on Pyramid Structure

Multimode‐Assisted Broadband Impedance‐Gradient Thin Metamaterial Absorber

Design of a broadband ultra‐thin metamaterial absorber with G‐type bent structure

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