Directional acoustic transmission based on metamaterials

To explore the simple low-loss operation of directional acoustic transmission technology, the propagation of acoustic waves in resonant phononic crystals was studied, and a transmission model based on acoustic metamaterials was constructed. Using the local resonance characteristics between acoustic waves and original cells, the multi-directional transmission of acoustic waves was modeled in the COMSOL software. It was found that acoustic waves generated by a point source are refocused into another point source after passing through the transmission model, and that the transmission loss is small. Under the control of this model, the effect of point-source propagation in various directions was achieved. The acoustic field characteristics of the model samples were also tested to verify the feasibility of the model structure, providing a new direction for applications such as underwater acoustic communication and detection.