Atmosphere Attenuation [hlp]

[No one]

Hello Everyone;
What is relation between atmosphere attenuation and frequency of the microwave wave? Is there any function or graph?

 

[FvM]

I suggest Radio Propagation topic at wikipedia.

 

[ND]

Well, i may give you this relation: (suitable for atmospheric attenuation that affects radar range)

Γ=0.438M / λ² [dB/km]

where is:
Γ - atmospheric attenuation
M - quantity of vapor in the air (measured in gr/m³)
λ - wave length in cm

This relation is empirical and stands for next conditions:
hidrometeors are relatively small size (clouds, fog, ...)
1/2 ≤ λ ≤ 10 cm
t = 18 °C

 

[ge]

There is a relationship between atmospheric attenuation and frequency. Also there is a relationship between atmospheric noise and frequency due to water mosture.

There's plenty of charts on internet. Let me know if you need addresses.