(a) Two-dimensional phononic crystals with a square lattice; (b) surface Brillouin zone of a square lattice.
The relation between the frequency band-gap width and the filling fraction.
The schematic diagram of this experimental setup.
SAW dispersion relation. (a) phase velocity dispersion curve; (b) electromechanical coupling coefficient dispersion curve.
Layered SFIT SAW filter.
Illustration of design parameters.
Dispersive and nondispersive frequency responses.
A microscopic picture of the fabricated layered SFIT.
The comparison of unmodified simulation responses and experimental results of design 1.
(a) Comparison of frequency responses with modified phase velocity (design 1); (b) the dispersive relation of propagation loss.
(a) A microscopic picture of two-dimensional phononic crystals; (b) cross section of two-dimensional phononic crystals.
The frequency band gaps of the phononic crystals are revealed by the layered SFIT of design 1 in the range of pass-band frequency. The shadow region represents the frequency band gap of fabricated phononic crystals with six rows of air cylinders.
The acoustic transmission coefficient.
Design parameters of the -layered structure.
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