Ultra-wideband and polarization-insensitive fractal perfect metamaterial absorber based on a three-dimensional fractal tree microstructure with multi-modes

In this study, the authors present three different metamaterial absorbers (MMAs) namely, T, split‐I (SI) and split‐Jerusalem cross (SJC) with different dimensions and geometrical configurations. The absorption rates of T‐, SI‐ and SJC‐shaped absorbers are studied at microwave frequencies. T‐shaped absorber demonstrates perfect absorption at 10.19 GHz, making it suitable for single band operation, whereas SI‐shaped absorber exhibits two perfect absorption peaks at 9.32 and 10.75 GHz finding its application in dual band operation. However, novel SJC‐shaped absorber demonstrates multiple absorption peaks at 9.92, 10.42, 10.93, 11.75 and 13.25 GHz with absorption of 99.5, 91, 99.9, 91.8 and 99.6%, respectively, making it suitable for X‐ and Ku‐band operations. The proposed MMAs have a thickness of around 0.8 mm (i.e. <λ/37) with respect to the lowest frequency of operation. Furthermore, the absorbers are analysed for different angles of polarisation and incidence for transverse electric polarised wave with a step size of 15°. The proposed absorbers have been fabricated and experimentally demonstrated at X‐band verifying the results obtained from simulations and implementing an equivalent circuit method. Further, SJC‐shaped absorber is demonstrated for multi‐and wide‐band terahertz applications exhibiting four perfect absorption peaks at 2.76, 2.89, 3.02 and 3.31 THz.

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“…Here, S 11 2 = S 11, xx 2 + S 11, xy 2 . The S 11,xx and S 11,xy represent the reflection of co-polarised and cross-polarised EM waves[23,24].…”

mentioning

confidence: 99%

Ultra‐thin metamaterial perfect absorbers for single‐/dual‐/multi‐band microwave applications

Jain

Singh

Pandey

et al. 2020

IET Microwaves, Antennas & Propagation

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“…Further, a time-harmonic plane wave is excited along the z-direction. Upon illuminating the top fractal metasurface, the overall absorption is determined as [35].…”

Section: Design and Modelingmentioning

confidence: 99%

“…However, the drawbacks, such as large size, fabrication complexities, and high cost, very often suffice. Some other techniques exploit the use of slot-loading [33], frequency selective surfaces [34] and fractals [21], [32], [35]. It remains rather challenging to achieve broadband absorption with the use of a single metasurface layer in designing PMAs.…”

Section: Introductionmentioning

confidence: 99%

“…By carefully designing and selecting the shape of unit cell, thereby contributing to construct the proposed device, wideband and miniaturized microwave and optical devices can be implemented. The present work relies on the fractal space-filling property that contributes to miniaturization and the selfsimilarity, and creates multiple resonances to attain wideband features [35]- [37].…”

Section: Introductionmentioning

confidence: 99%

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Wideband Microwave Absorber Comprising Metallic Split-Ring Resonators Surrounded With E-Shaped Fractal Metamaterial

et al. 2021

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A specially designed metallic E-shaped fractal-based perfect metamaterial absorber (PMA) with fairly wideband absorptivity in the K-and Ka-bands of the microwave regime was investigated. The PMA top surface is comprised of square-shaped split-ring resonators (SRRs) surrounded with the stated fractal design. The absorptivity of PMA was analyzed in the range of 20−30 GHz for the normal and oblique incidence of waves. Both the transverse electric (TE) and transverse magnetic (TM) modes were taken up to observe the robustness of the proposed design. It was observed that the fractal resonators exhibit capacitive effect at low frequencies, whereas the SRRs manifest capacitive effect at higher frequencies. The simulation and measured results were found to be in fairly good agreement. It is expected that the proposed design of PMA would be useful for 5G communication applications.

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“…In 2008, a perfect MA was first presented by Landy et al [13]. Subsequently, different types of MAs, such as single-band [14,15], dual-band [16][17][18][19][20][21], multi-band [22][23][24][25][26][27], and wideband absorbers [28][29][30][31][32][33][34][35][36], have been presented by various researchers. Among these MAs, multi-band MAs enable perfect absorption at several discrete frequencies, enabling applications like multiband sensing.…”

Section: Introductionmentioning

confidence: 99%

An Ultrathin, Triple-Band Metamaterial Absorber with Wide-Incident-Angle Stability for Conformal Applications at X and Ku Frequency Band

Deng

Sun

et al. 2020

Nanoscale Res Lett

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An ultrathin and flexible metamaterial absorber (MA) with triple absorption peaks is presented in this paper. The proposed absorber has been designed in such a way that three absorption peaks are located at 8.5, 13.5, and 17 GHz (X and Ku bands) with absorption of 99.9%, 99.5%, and 99.9%, respectively. The proposed structure is only 0.4 mm thick, which is approximately 1/88, 1/55, and 1/44 for the respective free space wavelengths of absorption frequency in various bands. The MA is also insensitive due to its symmetric geometry. In addition, the proposed structure exhibits minimum 86% absorption (TE incidence) within 60° angle of incidence. For TM incidence, the proposed absorber exhibits more than 99% absorptivity up to 60° incidence. Surface current and electric field distributions were investigated to analyze the mechanism governing absorption. Parameter analyses were performed for absorption optimization. Moreover, the performance of the MA was experimentally demonstrated in free space on a sample under test with 20 × 30 unit cells fabricated on a flexible dielectric. Under normal incidence, the fabricated MA exhibits near perfect absorption at each absorption peak for all polarization angles, and the experimental results were found to be consistent with simulation results. Due to its advantages of high-efficiency absorption over a broad range of incidence angles, the proposed absorber can be used in energy harvesting and electromagnetic shielding.

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Ultra-wideband and polarization-insensitive fractal perfect metamaterial absorber based on a three-dimensional fractal tree microstructure with multi-modes

Cited by 23 publications

References 26 publications

Ultra‐thin metamaterial perfect absorbers for single‐/dual‐/multi‐band microwave applications

Ultra‐thin metamaterial perfect absorbers for single‐/dual‐/multi‐band microwave applications

Wideband Microwave Absorber Comprising Metallic Split-Ring Resonators Surrounded With E-Shaped Fractal Metamaterial

An Ultrathin, Triple-Band Metamaterial Absorber with Wide-Incident-Angle Stability for Conformal Applications at X and Ku Frequency Band

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