Study on Bandgap Property of Three‐Dimensional Star‐Like Double‐Arrow Lattice

In the study of 3D acoustic lattice structures, the geometric topology is a key factor for the bandgap property. In article number 2300191, Dong Li, Zhijun Zhang and co-workers propose a 3D double-arrow lattice structure, which was inspired by the double-arrow negative Poisson's ratio structures. Based on Bloch's theorem, the bandgap property is calculated and studied numerically via the finite element method. Then, the anisotropy of this 3D lattice structure is investigated via the isosurface of phase velocity and group velocity. Strong anisotropy and energy focus appear, which can be used to design waveguides.