Super Broadband Acoustic Impedance Matching by MUT-type Acoustic Metamaterial

Abstract

We show the structure and matching theory of MUT-type acoustic matching device. A simulation model of the finite element method was constructed and the following evaluations were made: (1) analysis of the stress distribution inside the proposed device in order to find the mechanism of ultrasound propagation, (2) comparison of the performance as a acousitc matiching device with the conventional matching layer method in ultrasound frequency, and (3) dependence of acoustic matching performance on design parameters. The MUT-type acoustic matching device based on the proposed design guidance showed higher acoustic transmittance and wider bandwidth than the conventional 1/4 wavelength acoustic matching system.