Acoustic metamaterial

A technology of acoustic metamaterials and metamaterials, applied in the direction of sound-generating devices, instruments, etc., can solve problems such as incremental increase and electrical instability, and achieve good attenuation performance

Pending Publication Date: 2019-07-16
KUANG CHI CUTTING EDGE TECH LTD
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Problems solved by technology

[0002] In the existing piezoelectric metamaterial structure based on negative capacitance technology, in the metamaterial unit, because a branch of a negative capacitance is generally only connected to a single piezoelectric sheet alone, or a branch of a negative capacitance is connected to two piezoelectric sheets in the same position. Between the electric sheets, the metamaterial unit and the subperiod unit of the structure overlap. However, although

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0026] According to an embodiment of the present invention, an acoustic metamaterial is provided, and the acoustic metamaterial includes a plurality of periodically arranged metamaterial units.

[0027] Such as figure 1 As shown, the metamaterial according to the embodiment of the present invention includes: N g Periodically arranged metamaterial units, where N g is an integer greater than or equal to 3; wherein, each metamaterial unit includes: a plurality of periodically arranged sub-peri...

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Abstract

The invention discloses an acoustic metamaterial. The acoustic metamaterial comprises Ng metamaterial units periodically distributed, wherein Ng is an integer greater than or equal to 3; and each metamaterial unit comprises a plurality of sub period units periodically distributed, each sub period unit comprises two piezoelectric elements, and the two piezoelectric elements on each sub period unitare connected with two branches of a negative capacitor. For the acoustic metamaterial, the Ng metamaterial units are periodically distributed, each metamaterial unit comprises a plurality of sub period units, the two piezoelectric elements of each sub period unit are connected with two branches of the negative capacitor, and therefore, by utilizing the piezoelectric metamaterial of a negative capacitor circuit network in pairing interconnection, the local-area resonance forbidden band gap with better attenuating property can be generated with fewer damping circuit branches of the negative capacitor and within the specific relatively wide frequency band, especially the lower frequency band.

Description

technical field [0001] The invention relates to the field of metamaterials, in particular to an acoustic metamaterial. Background technique [0002] In the existing piezoelectric metamaterial structure based on negative capacitance technology, in the metamaterial unit, because a branch of negative capacitance is generally only connected to a single piezoelectric sheet alone, or a branch of negative capacitance is connected to two piezoelectric sheets in the same position. Between the electric sheets, the metamaterial unit and the subperiod unit of the structure overlap. However, although this technical solution can realize the bandgap performance of wide frequency band, with the increasing number of subperiod units in the piezoelectric metamaterial, The number of branches of the negative capacitance applied in the metamaterial unit will also increase accordingly, so that at the electrical level of the piezoelectric metamaterial, the risk of electrical instability caused by t...

Claims

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Application Information

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IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 不公告发明人
Owner KUANG CHI CUTTING EDGE TECH LTD
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