Experimental investigation on stackable sub-wavelength sound absorbers based on coiled up-system.

A subwavelength structure absorber is developed and demonstrated. It differs from other subwavelength systems, we use several coiled-up resonators combined in a stack way. Such a system is proposed to cover acceptable absorption coefficient as well as obtaining relatively wider absorption bandwidth. Moreover, it is expected that such a system offers a great tunability and configurable system in absorption to meet targeted frequency and bandwidth. In this article, experimental results are presented as an early investigation to prove the concept. [ABSTRACT FROM AUTHOR]