Table 2.
Material parameters after calibration.
| Material | Roughness (m) | Conductivity (S/m) | Permittivity | |
|---|---|---|---|---|
| Tunnel Wall | Concrete | 0.075 | 0.09 (3.5 GHz)/0.15 (5.6 GHz) | 5.31 |
| Rail | Metal | - | 107 | 5.31 |
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