It is given by the formula α = 2πf√(με), where f is the frequency, μ is the permeability, and ε is the permittivity of the medium. In this case, the frequency is 2.5 GHz, the permeability is μ = 4π × 10^(-7) N/A^2, and the permittivity is ε = 8.854 × 10^(-12) F/m.
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