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| Material | Simulated directivity (°) | Experimental directivity (°) | Acoustic pressure (V) | Center frequency(MHZ) |
|---|---|---|---|---|
| No lens (water) | 14 | 11 | 0.98 | 2.15 |
| Compound | 58 | 55 | 0.6 | 1.9 |
| Compound-reverse | 24 | 22 | 0.48 | 1.9 |
| Epoxy | 30 | 36 | 0.62 | 2.1 |
| Liquid | 25 | 25 | 0.71 | 2 |
| PDMS | 21 | 20 | 0.67 | 2 |
