Research Article

An Analytical Model for Bandwidth Enhancement of Air-Coupled Unsealed Helmholtz Structural CMUTs

Figure 14

FEM results of the Half case: SPL comparison of two cells with same hole area ratio, a=30μm 4 holes & a=7.25μm 68 holes (FBW: 3-dB fractional bandwidth, SPL-BWP: SPL-bandwidth product).