An acoustic wave collimating device according to an embodiment of the present invention, An object in which at least one unit lattice is periodically formed, a first dynamic frequency curve obtained by an acoustic wave incident on the unit lattice that satisfies the effective material property condition in the low frequency band, and the effective material property condition in the high frequency band a second dynamic frequency curve obtained when an acoustic wave is incident on the unit grid, wherein the effective material property condition is obtained according to an elastic equation analysis of the object, and the acoustic wave incident into the object is collimated in a predetermined direction do it with
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