Article

Metamaterial labyrinth absorption frequency and amplitude dependency on additionally attached plate (en)

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Day / Time: 08.03.2023, 15:40-16:20
Typ: Poster
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Abstract: The absorption of a hemispherical labyrinth structure was measured using an impedance tube. A standing wave method revealed a band-gap occuring in a narrow frequency range. The absorption was found in the subwavelength of the labyrinth substructure. Adding a plate behind the labyrinth showed an alternation of the damping frequency and reflectance by alternating the thickness of the attached plate. Furthermore, removing the plate leads to a complete vanishing of the band-gap absorption. This points to a dependency of the labyrinth efficiency on the attached plate. So the method not only allows to alter absorptive frequency range and efficiency, it also shows a simple way to remove the effect completely.
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