Acoustic metamaterial

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...

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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 this technical solution can realize the bandgap performance of wide frequency band, with the increase of the 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 the negative capacitance analog circuit will also increase

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