Among other possible designs, metamaterials constructed from ensembles of meta-dipoles emerged as a flexible platform to redirect wave fields. We present an acoustic PT-dipole constructed from two Helmholtz resonators with different losses for such acoustic metamaterials. We explore dipole ensembles in a two dimensional space to either concentrate the field in a predefined area or create a silent area. Numerical simulations agree with experimental results and confirm the sound directivity created by the PT-dipole ensembles.

Objectius de Desenvolupament Sostenible::9 - Indústria, Innovació i Infraestructura