Quarter wavelength resonator in experiment and simulation

Kůrečka, Jan; Čepl, Ondřej

doi:10.1051/epjconf/202226901030

Cited by 1 publication

(1 citation statement)

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“…A common solution to this problem is to create an acoustic impedance matching layer with attributes that lie between the two impedance matching media. When combining materials with traditional elastic characteristics and densities, a minimum thickness of the order of one quarter wavelength of the lowest frequency under consideration is necessary in most circumstances [18].…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Fano-like resonant transmission: frequency selective impedance matching

Esposito,

Tallarico,

Sayed Ahmed

et al. 2024

J. Phys. D: Appl. Phys.

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When designing an acoustic device, the study of the impedance mismatch between thedevice itself and its surroundings is of critical importance to achieve good performances. Infact, a high impedance mismatch would prevent the transmission of the energy across theinterface, thus limiting the amount of energy that the device itself could treat. Generally,this is overcome by applying acoustic impedance matching layers, for instance in the formof gradients, similar to what done in optical coatings. The minimal form of such a gradientcan be seen as an intermediate layer with specific properties laying between the ones ofthe two media to impedance match, and, in any case, requiring a minimum thickness ofthe order of at least one quarter wavelength of the lowest frequency under consideration.The selection of materials is traditionally dictated by the required combination(s) of the(limited) available elastic properties and densities. Nature, also constrained by the use ofa limited number of materials in the design of the biological structures, shows the wayto a different approach, where the design space is swept by varying specific geometricaland/or material parameters. The middle ear of mammals and the lateral line of fishes areexamples of such an approach, the latter already embodying an architecture of distributedimpedance matched underwater layers. Inspired by this organ, here we describe a resonantmechanism, whose properties can be tuned to provide impedance matching at differentfrequencies by choosing appropriate values for a small set of geometrical parameters.Similar to the lateral line organ, the mechanism at hand is intended as the base unit forthe construction of an impedance matching meta-surface. A numerical investigation anda parameter optimization demonstrate its ability to match the impedance of water and airin a deeply sub-wavelength regime.

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Section: Introductionmentioning

confidence: 99%