In this work, a design approach for achieving arbitrary acoustic power splitting is proposed. Several space-varying air slits are adopted to connect multiple acoustic cavities, thus realizing quantum-like adiabatic transfer in acoustic systems. By altering the coupling actions between composing cavities, the splitting ratios can be customized on demand. The one to m-port power splitting is achieved in planar as well as spatial configurations, showing an excellent applicability to numerous different scenarios. Remarkably, the acoustic waves from adjacent output ports not only have desired splitting ratios, but also have opposite phases. Hence, a broadband and asymmetric acoustic metamaterial is further constructed, through which the beam splitting and asymmetric wave transmission behaviors can be realized simultaneously in a free space. The proposed acoustic power splitter design offers a simple configuration, broadband performance, and high flexibility, making it a promising candidate for applications in acoustic detection, sensing, and communication.
Tang et al. (Mon,) studied this question.