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Policy on Intellectual Property Right (IPR)    ii
RECOMMENDATION ITU-R P.676-8    1
Attenuation by atmospheric gases    1
Scope    1
Annex 1 Line-by-line calculation of gaseous attenuation    1
1    Specific attenuation 1
2    Path attenuation 8
       2.1    Terrestrial paths 8
       2.2    Slant paths 8
3    Dispersive effects 12
Annex 2 Approximate estimation of gaseous attenuation in the frequency range 1-350 GHz    12
1    Specific attenuation 12
2    Path attenuation 14
       2.1    Terrestrial paths 14
       2.2    Slant paths 16
                 2.2.1    Elevation angles between 5� and 90� 17
                 2.2.2    Elevation angles between 0� and 5� 18
       2.3    Slant path water-vapour attenuation 21

CONTENTS