The attenuation due to atmosphere is given by

(Eq. 217)

where:

linear attenuation due to dry air (oxygen) in dB/km

linear attenuation in dB/km due to water as function of the water concentration in g/m³, default value: 3 g/m³

Both terms can be approximated by the following equations according to ITU-R Rec. P.676-1:

(Eq. 218)

for f < 350 GHz

(Eq. 219)

f<= 57 GHz

57 < f <= 60 GHz

60 <f <= 63 GHz

for f> 63 GHz

Note: For simplification a linear interpolation between 57 and 63 GHz is used. The maximum is 15 dB/km for 60 GHz.

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