Table 1. Simulation parameters of the gradient metamaterial matching layer transducer.
| Layer | ρ (kg/m) | V(m/s) | Z (MRayls) | t (mm) |
|---|---|---|---|---|
| Piezoelectric Ceramics | 6300 | 3200 | 20.16 | 0.395 |
| Matching Layer 1 | 2102 | 5763 | 12.11 | 0.39 |
| Matching Layer 2 | 1921 | 5435 | 10.44 | 0.0675 |
| Matching Layer 3 | 1759 | 5089 | 8.95 | 0.0675 |
| Matching Layer 4 | 1617 | 4708 | 7.61 | 0.0675 |
| Matching Layer 5 | 1493 | 4293 | 6.41 | 0.0675 |
| Matching Layer 6 | 1388 | 3853 | 5.35 | 0.0675 |
| Matching Layer 7 | 1302 | 3413 | 4.44 | 0.0675 |
| Matching Layer 8 | 1236 | 3016 | 3.73 | 0.0675 |
| Matching Layer 9 | 1188 | 2728 | 3.24 | 0.0675 |
| Matching Layer 10 | 1150 | 2621 | 3.01 | 0.0675 |
| Backing Layer | 3900 | 2000 | 7.8 | 20 |
Simulation of the gradient metamaterial matching layer transducer was carried out through Piezocad by discretizing the matching layer into 10 sub-layers, and each sub-layer could be regarded as a homogeneous material with the acoustic parameters presented in this table.