Investigation on the Band Gap and Negative Properties of Concentric Ring Acoustic Metamaterial

Chen, Meng; Meng, Dan; Jiang, Heng; Wang, Yuren

doi:10.1155/2018/1369858

Cited by 8 publications

(6 citation statements)

References 45 publications

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“…If the series and shunt resonating frequencies are the same, then the transition from the LH to RH region will be gapless and result in a balanced CRLH material [26]. This can be achieved by ensuring the balanced condition, given by equation (12).…”

Section: Circuit Modelling Of a Crlh Metamaterialsmentioning

confidence: 99%

“…There are various metamaterial designs available in the literature which result in metamaterial behaviours like diamondshaped [10], cross-shaped [11], concentric ring resonators [12], EM resonators [13], n-point star resonators [14], bed nails [15], fishnet [16], modified S-shaped SRR [17], complementary quad spiral resonator [18] and many more for different types of metamaterial applications. However, most of the reported metamaterials are found either having the SNG or narrow band DNG responses.…”

Section: Introductionmentioning

confidence: 99%

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A compact CRLH metamaterial with wide band negative index characteristics

2019

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Metamaterials are the artificial materials that may have a negative refractive index and results in extraordinary properties which are not found in nature. This research focusses on designing a compact-sized artificial material for negative characteristics of permittivity, permeability and refractive index over the wide range of frequencies. The metamaterial design is evaluated for single negative, double negative and double positive behaviours over a broad range of frequencies to investigate the gap and gapless transitions from backward to forward wave propagation. The dispersion diagram of the material is also investigated for left or right hand behaviour of the material. The equivalent circuit diagrams along with circuit simulations of the parameters are also presented for detailed analysis and understanding. The designed metamaterial behaves like a double negative material for low frequencies and double positive material for high frequencies. The approach is verified using CST microwave studio simulation and the results obtained are validated using the rectangular waveguide measurement method.

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Section: Circuit Modelling Of a Crlh Metamaterialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A compact CRLH metamaterial with wide band negative index characteristics

2019

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“…g) 2D single, double, and triple oscillators based on concentric‐ring locally resonant AMs. [ 48 ] h) Multilayered locally resonant AMs. Reproduced under the terms of the Creative Commons CC‐BY license.…”

Section: Current Progress In Research Of Am Structuresmentioning

confidence: 99%

“…It was revealed that the band structure can be governed based on the number of oscillators and parameter adjustment over a wide frequency range. Chen et al [48] investigated 2D single, double, and triple oscillators based on the concentric-ring locally resonant structure of metamaterials (Figure 3g). The coupling effect further increased the resonance modes, widened the frequency ranges, and aggrandized the bandgap numbers.…”

Section: Locally Resonant Structurementioning

confidence: 99%

Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

Liao

Luan

Wang

et al. 2021

Adv Materials Technologies

128

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Acoustic metamaterials (AMs), which are materials composed of subwavelength periodic artificial structures with specific designs, have drawn significant research attention. This is because of the extraordinary abilities of AMs to manipulate acoustic waves compared with those of traditional acoustic materials. In this review, current advances in AM research are comprehensively investigated and summarized. First, major theories regarding AMs, including the acoustic wave equation, crystal lattice and energy band theory, effective medium theory, and general Snell's law, are explained in detail. Existing AM structures are then described and divided into several categories based on their structural characteristics and responses to acoustic waves. Furthermore, to bridge the gap between design and practical application, both conventional and advanced AM manufacturing methods are summarized. The applications of AMs in the fields of acoustic cloaking, acoustic lensing, acoustic absorption, noise reduction, and supernormal sound transmission are particularly delineated. Finally, contemporary challenges, trends, and strategies relevant to AMs are discussed. This review aims to provide a comprehensive collection of AM‐related knowledge, including information regarding physical theories, structures, fabrication approaches, and applications, which will help promote the further development of AMs.

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“…The inclusions have a negative shear modulus and negative mass density in a specific frequency range, resulting in a “single‐negative” material in which longitudinal waves are forbidden while transverse waves propagate with negative refraction. [ 36 ] Researchers have proposed 2D curled space‐type structures, [ 37 ] double‐layer coupled film structures, [ 38 ] concentric ring structures filled with oscillators, [ 39 ] and multipolar resonance‐enabled robust multicavity metamaterial [ 40 ] to produce negative mass density and elastic modulus. Zhu et al [ 41 ] proposed a chiral microstructured elastic metamaterial made of a single‐phase material to achieve subwavelength negative refraction of elastic waves and summarized the wave‐mode conversion law connected with negative refraction.…”

Section: Introductionmentioning

confidence: 99%

Bandgap and Wave Propagation Properties of 2D Curved and Chiral Hybrid Star‐Shaped Metamaterials

Xin

Zhang

Du³

et al. 2022

Physica Status Solidi (b)

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Designing artificial microstructural metamaterials that fulfill the single‐phase vibration dampening and lightweight twin goals is challenging and critical. 2D curved and chiral hybrid star‐shaped metamaterials (CCHSM) are proposed to perform vibration reduction filtering in the midfrequency region by combining the properties of chiral structure and concave structure. The generating process of the bandgap of in‐plane elastic waves, the properties of directional attenuation, and the flow direction of energy in the dispersion curve are examined using the modal shape, dispersion surface, and group velocity. In a specific frequency range, the equivalent medium parameters satisfy the conditions of negative refraction transverse and longitudinal waves, so the structure also has double‐negative characteristics. The filtering performance is validated using the CCHSM periodic plate structure and a finite‐element simulation of transmission loss. In addition, the correlation between wave attenuation characteristics and structural parameters is explored. The radius of the circular arc and the deflection angle of the connecting rod have a significant impact on the frequency range of the structural bandgap. The results show that the created simple‐configured, single‐phase lightweight acoustic metamaterials exhibit strong local resonance properties and double‐negative features.

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Investigation on the Band Gap and Negative Properties of Concentric Ring Acoustic Metamaterial

Cited by 8 publications

References 45 publications

A compact CRLH metamaterial with wide band negative index characteristics

A compact CRLH metamaterial with wide band negative index characteristics

Acoustic Metamaterials: A Review of Theories, Structures, Fabrication Approaches, and Applications

Bandgap and Wave Propagation Properties of 2D Curved and Chiral Hybrid Star‐Shaped Metamaterials

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