A Coiling-Up Metamaterial for Acoustic Band-Stop Filtering
A Coiling-Up Metamaterial for Acoustic Band-Stop Filtering |
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| © 2025 by IJETT Journal | ||
| Volume-73 Issue-5 |
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| Year of Publication : 2025 | ||
| Author : Seonggeon Bae | ||
| DOI : 10.14445/22315381/IJETT-V73I5P125 | ||
How to Cite?
Seonggeon Bae , "A Coiling-Up Metamaterial for Acoustic Band-Stop Filtering," International Journal of Engineering Trends and Technology, vol. 73, no. 5, pp.297-303, 2025. Crossref, https://doi.org/10.14445/22315381/IJETT-V73I5P125
Abstract
In this study uses the efficient refractive index and efficient impedance to analyze two coiling-up structures with differing sound pressure. These structures have a high effective refractive index and effective impedance. To calculate the resonance frequencies, the coiling structures were modelled as a simple medium7, 8, 13. Our study calculated the sound pressure using the Fabry-Perot resonance theory. The application of this calculation applies to the different features of both open and closed cavity structures. In other words, it acts as a band-stop filter to reduce specified frequencies. We designed a metamaterial as an acoustic filter to attenuate or reject the desired frequency components using two types of cavities. Sound pressure typically appears as a periodic feature in the open cavity structure. In the closed cavity structure, the sound pressure produces attenuation due to the effects of the reflections on the slab. At the end of the transmission, the characteristics of the FP are maintained and the specified frequency components exhibit attenuation. These features can be applied to acoustic focusing, cloaking and filtering.
Keywords
Coiling-up, Sound pressure, Open and closed cavity, Fabry-Perot resonance, Metamaterial.
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