Design Implementation of Concentric Loops with Stubs Metamaterial Absorber

Singh, Dhawan; Srivastava, Viranjay M.

doi:10.1007/s11277-018-6012-y

Cited by 2 publications

(2 citation statements)

References 28 publications

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“…Therefore, this method requires approximate treatment of impedance, z = (1 + S 11 ) / (1 − S 11 ), [8] otherwise the symmetric metamaterial method is still the best choice. [18][19][20][21][22][23][24][25][26] The strong internal electromagnetic coupling produces the second characteristic of these materials. At the absorption frequency, the current generated in the bottom layer is opposite to that of the electric resonance layer.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of the effective constitutive parameters from metamaterial absorbers*

Shi¹,

Qiao²,

Liu³

et al. 2021

Chinese Phys. B

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The equivalent medium theory of metamaterials provides a way to obtain their effective constitutive parameters. However, because of its non-reciprocity, the complexity of the electromagnetic coupling, and a metallic bottom layer, it has been challenging to retrieve them from a metamaterial absorber. In this paper, we propose a method without any approximation to obtain them, in which the non-reciprocity and the strong electromagnetic coupling are included. Compared with the three methods such as symmetric metamaterial method, asymmetric metamaterial method and metasurface method, our method can reveal the metamaterial absorber’s electrical and magnetic resonance and show its electromagnetic coupling coefficients. To deal with a metamaterial absorber with a metallic bottom layer, four corners of the metallic bottom layer in the unit cell are removed, making it possible to retrieve the electromagnetic parameters. Surprisingly, these results show that the metamaterial absorber with a metallic bottom layer in our example operates in a negative refraction state at the half absorption frequencies, which helps further understand the absorbing mechanism of these metamaterial absorbers.

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Section: Introductionmentioning

confidence: 99%

Retrieval of the effective constitutive parameters from metamaterial absorbers*

Shi¹,

Qiao²,

Liu³

et al. 2021

Chinese Phys. B

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show abstract

“…FR4 substrates are the most common dielectric medium used in these designs. However, the bandwidths of these absorbers are still narrow [11,23,24]. Some works were done with a very small size of unit cells, but they compromised the bandwidth [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Design of a Novel Double Negative Metamaterial Absorber Atom for Ku and K Band Applications

et al. 2019

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This paper presents a multiband metamaterial (MM) absorber based on a novel spiral resonator with continuous, dual, and opposite P-shape. The full wave analysis shows 80.06% to 99.95% absorption at frequencies range for Ku and K bands for several substrate materials of 100 mm2 area. The results indicate that the absorption rate remains similar for different polarizing angles in TEM mode with different substrates. With FR4 (Flame Retardant 4) substrate and 64 mm2 ground plane, the design acts as single negative (SNG) MM absorber in K band resonance frequencies (19.75–21.37 GHz) and acts as double negative (DNG) absorber in Ku band resonance frequencies (15.28–17.07 GHz). However, for Rogers 3035 substrate and 36 mm2 ground plane, it acts as an SNG absorber for Ku band resonance frequency 14.64 GHz with 83.25% absorption and as a DNG absorber for K band frequencies (18.24–16.15 GHz) with 83.69% to 94.43% absorption. With Rogers 4300 substrate and 36 mm2 ground plane, it acts as an SNG absorber for Ku band at 15.04 GHz with 89.77% absorption and as DNG absorber for K band frequencies (22.17–26.88 GHz) with 92.87% to 93.72% absorption. The design was fabricated with all three substrates and showed quite similar results as simulation. In comparison with other broadband absorbers, this proposed MM absorber illustrated broad incidence angles in TEM mode.

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Design Implementation of Concentric Loops with Stubs Metamaterial Absorber

Cited by 2 publications

References 28 publications

Retrieval of the effective constitutive parameters from metamaterial absorbers*

Retrieval of the effective constitutive parameters from metamaterial absorbers*

Design of a Novel Double Negative Metamaterial Absorber Atom for Ku and K Band Applications

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