Research Article
An Analytical Model for Bandwidth Enhancement of Air-Coupled Unsealed Helmholtz Structural CMUTs
Table 3
3-dB fractional bandwidth and SPL-bandwidth product of the Standard case as shown in Figure
8.
| | Hole radius [µm] | a=20 | a=40 | a=60 | a=80 | a=100 | no hole |
| | fh [kHz] | 92.3 | 138.5 | 176.5 | 211.3 | 244.7 | =167.5 | | Separation between fp and fh [kHz] | 75.2 | 29 | 9 | 43.8 | 77.2 | | | 3-dB fractional bandwidth | 4.8% | 11.6% | 35.7% | 7.3% | 3.8% | 0.9% | | SPL-bandwidth product | 1.22 | 2.88 | 8.01 | 1.51 | 0.77 | 0.23 |
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