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Table 1 Dielectric properties of concrete materials measured at 60 GHz

From: Channel characteristics of MIMO–WLAN communications at 60 GHz for various corridors

Materials Relative permittivity
  Real Imaginary Conductivity Tan loss
  ε' ε'' σ Tan(δ)
Concrete 6.4954 0.4284 1.43E+00 6.60E–02