Microwave metamaterial for broad-band perfect absorber applications

Al-Badri, Khalid Saeed Lateef

doi:10.1016/j.matpr.2020.12.730

Cited by 11 publications

(2 citation statements)

References 28 publications

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“…The designing of metamaterial absorbers with an appropriate working frequency spectrum, a decent wide-angle tolerance, bandwidth, polarization, a compact size, insensitivity, and a simple fabrication method, however, is difficult in practice. An ideal metamaterial absorber often has a small bandwidth due to its resonance characteristics [ 24 ]. Consequently, much work has been carried out to increase the bandwidth of metamaterial absorbers so that they may be used in more real-world applications [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

An Ultra-Thin, Triple-Band, Incident Angle-Insensitive Perfect Metamaterial Absorber

et al. 2023

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We created an ultra-thin, triple-band incident angle-insensitive perfect metamaterial absorber (MMA) with a metallic patch and a continuous metal ground isolated by a central dielectric substrate. The top metallic patch, placed across the edges of the 0.58 mm thickness Rogers RO4003C (lossy) substrate, forms the bulk of the projected absorber’s ultra-thin layer. Nonetheless, absorption is exceedingly strong, covering C-band, X-band and K-band and reaching levels of 97.8%, 99.9%, and 99.9%, respectively, under normal and even oblique (0° to 45°) incident conditions. In chosen ranges of frequency of 6.24, 10.608, and 18.624 GHz for both TM and TE mode, the displayed Q-factors were 62.4, 17.68, and 26.61, respectively. We correspondingly calculated the RAB (relative absorption bandwidth) to evaluate absorption performance. An equivalent circuit proved its performance capabilities, indicating that it would produce a high-quality MMA from ADS software. Furthermore, the absorber’s performance has been verified in free space on a sample being tested using a different array of unit cells. Moreover, the proposed structures with HFSS simulators to display the MMA’s absolute absorption at each absorption peak are somewhat inconsistent with the results of the CST simulator. Because of its superior performance, the ultra-thin absorber is suited for a wide range of applications, including satellite applications such as radar systems, stealth technology, imaging, and electromagnetic interference reduction.

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Section: Introductionmentioning

confidence: 99%

An Ultra-Thin, Triple-Band, Incident Angle-Insensitive Perfect Metamaterial Absorber

et al. 2023

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“…Efforts have been made to achieve multi-band or broadband high-level absorption for EM waves [26,27,28,29,30,31,32,33]. Two design strategies have been employed: combining multiple sub-units within a super-unit resonant structure [6,7,8], or constructing alternating patterned metallic structures and dielectric layers with different geometric parameters [28,29,30,31,32]. However, both strategies have limitations, such as increased fabrication cost, angular dependence, and neglecting high-order EM responses.…”

Section: Introductionmentioning

confidence: 99%

Planar Complementary Archimedes Metamaterial Absorber with Polarization Sensitivity for Microwave Sensing Applications

Lateef,

Al-Badri,

Al-badri

et al. 2023

Preprint

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We have developed and simulated a planar complementary Archimedes-based metamaterial absorber with the goal of its application in refractive index sensing. Unlike designs that employ multiple layers or numerous resonators within a single unit cell, our proposed absorber adopts a more streamlined approach. It consists of three layers, with an FR4 dielectric substrate sandwiched between two copper layers. It's important to note that the absorption characteristics of this design are polarization-dependent. This polarization dependence arises from the asymmetrical resonance behavior observed in both the x and y directions. The absorber exhibits impressive absorption rates at various resonance frequencies, namely 98.5% at f1 = 8.49 GHz, 77.1% at f2 = 8.88 GHz, 88.7% at f3 = 9.3 GHz, 98.2% at f4 = 9.87 GHz, 99.7% at f5 = 10.65 GHz, 83.4% at f6 = 11.58 GHz, and 99.9% at f7 = 12.24 GHz. Furthermore, we've explored the refractive index sensing capabilities of this structure by introducing a 1 mm analyte layer on top of the patch structure. Through refractive index sensing analysis, we've determined that this absorber-based sensor yields an impressive high-quality factor value of 84.5, underscoring its sensitivity and precision. To gain a deeper understanding of the physical mechanisms at play, we've conducted an analysis of surface current distribution plots. Additionally, we've investigated the behavior of the absorber under varying polarization and incident angle conditions, ranging from zero degrees to sixty degrees. This comprehensive characterization positions our absorber as a promising candidate for microwave sensing applications.

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Multiband polarization-insensitive cartwheel metamaterial absorber

et al. 2022

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Metamaterials are speci cally engineered to produce electromagnetic properties that are not available in natural materials. Multiband metamaterial (MM) absorbers achieve great research interest due to their applications in sensing, ltering, and stealth. These absorbers are mostly made of multilayered and complex geometrical structures. In this work, a single layered cartwheel shaped (CWS), polarizationinsensitive MM absorber operating in the microwave band is proposed. It shows a good angular stability, and multiple absorption peaks are attained due to multiple electric and magnetic resonances. Moreover, absorption characteristics can be tuned by modifying the substrate thickness. The comparison of simulated results and measured results show good agreement with each other. This absorber would be useful for sensing and ltering applications in microwave devices.

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Microwave metamaterial for broad-band perfect absorber applications

Cited by 11 publications

References 28 publications

An Ultra-Thin, Triple-Band, Incident Angle-Insensitive Perfect Metamaterial Absorber

An Ultra-Thin, Triple-Band, Incident Angle-Insensitive Perfect Metamaterial Absorber

Planar Complementary Archimedes Metamaterial Absorber with Polarization Sensitivity for Microwave Sensing Applications

Multiband polarization-insensitive cartwheel metamaterial absorber

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