Atmospheric Effects
At these high frequencies the short wavelengths give the radiation a very directional quality, similar to visible light. Many molecules possess rotational and vibrational states excited by very specific wavelengths in this band, thus the atmospheric gasses such as Oxygen, Water Vapor, Carbon Dioxide and Nitrogen can absorb, and be excited causing variable beam attenuation effects dependent on meteorological and atmospheric conditions.
Read more about this topic: E Band
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