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(a) Cross section of the modified HR array and the experimental setup, (b) transmission spectra for sample when V, W, L, S, and substrate thickness are 0.2a, 0.7a, 0.5a, 0.5a, and 4.275a, respectively. The simulation and experimental results are shown by the red and black solid lines, respectively.
Pressure and velocity field are indicated by background color and blue arrowheads, respectively. The structure is operated in water at frequencies of (a)0.173 and (b) 0.677 MHz; (c) and (d): Model corresponding to (a) and (b), respectively. The water bulk in the vicinity of the neck vibrates in the y direction.
Simulation results for resonant frequencies vary with the geometric parameters S and V. The FDTD results and the fitting curve results are denoted by the dashed line and solid lines, respectively. The S value varies from 0.1a to 0.5a. The V value varies from 0.1a to 0.7a.
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