The passive lossless acoustic metasurfaces (AMs) usually use nonlocal behaviors to realize high-efficiency acoustic field manipulation. However, nonlocal behaviors always need complicated unit-cell designs or structure optimizations. In this work, a simple passive lossless AM without nonlocal responses is proposed to perfectly manipulate multi-order diffraction beams. We demonstrate theoretically that the proposed AM can efficiently split an incident acoustic wave into desired reflected directions with arbitrary power flow ratio. Then two examples of two-beam and three-beam lossless AM splitters are constructed with well-designed rigidly ended tubes. Simulation results verify that nearly 100% reflection efficiency can be achieved in the two AM splitters and the power flow distributions are in accord with the designed values. Finally, we fabricate the two-beam AM splitter and confirm experimentally that it can achieve high-efficiency reflection splitting with arbitrary power distribution. Our proposed AM may contribute to designing devices for different applications in energy harvesting and communication.

被动无损声学超表面（AMs）通常使用非局部行为来实现高效的声场操纵。然而，非局部行为总是需要复杂的晶胞设计或结构优化。在这项工作中，提出了一种没有非局部响应的简单无源无损 AM 来完美地操纵多阶衍射光束。我们从理论上证明，所提出的 AM 可以有效地将入射声波分成具有任意功率流比的所需反射方向。然后，两束和三束无损 AM 分路器的两个例子是用设计良好的刚性端管构建的。仿真结果验证了两个 AM 分路器的反射效率接近 100%，并且潮流分布符合设计值。最后，我们制作了两光束调幅分束器，并通过实验证实它可以实现任意功率分布的高效反射分束。我们提出的 AM 可能有助于为能量收集和通信中的不同应用设计设备。