Abstract
The narrow bandwidth and low amplification performance of a subwavelength acoustic resonator greatly limit its applications. In this study, broadband acoustic amplification using an array of two-dimensional quarter-wavelength resonators is investigated. A new acoustic resonator unit is designed, which contains one open end with an impedance-gradient meta-structure and another closed end to confine the acoustic transmission and achieve sound amplification. The sound pressure level (SPL) gain and bandwidth of the resonator can be controlled by changing its geometric parameters. In an energy-harvesting experiment, the broadband amplification resonator provides a 17.2-dB SPL gain and enhanced output voltages.
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