Abstract:

Choosing a central frequency to calculate the central wavelength of every component, and determining every component's
thickness coefficients with ratios of their central wavelength, and defining each component's ratio of thickness coefficient with a certain
component's thickness coefficient, and the transmission characteristics of the three components phononic crystal were calculated with
transfer matrix method for different thickness coefficient and ratio of thickness coefficient. The results show that the distribution of the
conduction band presents very perfect symmetry. With the changing of the thickness coefficient and the thickness coefficient ratio, all
of the frequency center of the conduction band and the conduction band width and the center of the adjacent conduction band
frequency interval present obvious regularity, but there is nothing to do with the changing of the original cell number.

Key words: phononic crystal, conduct band, central wavelength, thickness coefficient, ratio of thickness coefficient