The inherent attenuation of a homogeneous viscous medium limits radiation propagation,
thereby restricting the use of many high-frequency acoustic devices to only short-range
applications. Here, we design and experimentally demonstrate an acoustic metamaterial
localization cavity which is used for sound pressure level (SPL) gain using double coiled up
space like structures thereby increasing the range of detection. This unique behavior occurs
within a subwavelength cavity that is 1/10th of the wavelength of the incident acoustic wave …