Two-dimensional phononic crystal with tunable narrow pass band: Application to a waveguide with selective frequency

摘要: We study theoretically the propagation of elastic waves in two-dimensional composite media composed a square array hollow steel cylinders embedded water using finite-difference time-domain method. These constitute class acoustic band gap materials with narrow pass bands their transmission stop bands. The frequency at which occurs is tunable by controlling inner radius tubular inclusions. effect tube on spectrum semiquantitatively separable from periodicity. A linear defect formed row an filled produces waveguide that transmits frequency. show two these waveguides different radii can be employed to filter and separate specific frequencies broad input signal.