Research Article
Analysis of Propagation Characteristics for Various Subway Tunnel Scenarios at 28 GHz
Table 5
Parameter settings of all materials.
| | Object | Material | Frequency (GHz) | Relative permittivity | Conductivity (S/m) | Thickness (m) | Roughness (m) |
| | Tunnel wall | Concrete | 28 | 5.31 | 0.48 | 0.5 | 0.005 | | Rail | Metal 1 | 28 | — | — | 0.05 | 0.0001 | | Carriage | Metal 2 | 28 | — | — | 0.05 | 0 | | Windows | Glass | 28 | 6.27 | 0.23 | 0.03 | 0 | | Chairs | Plastic | 28 | — | — | 0.05 | 0 |
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