Which effect sharply increases millimeter wave propagation losses in humid air above 60 GHz?

💡 Explanation

When millimeter waves propagate through humid air, resonant absorption by water molecules occurs because specific rotational energy levels of water match the wave frequency, causing energy transfer to the molecules. Therefore absorption increases significantly above 60 GHz, suppressing propagation rather than due to scattering based on particle size or reflection based on thermal gradients.

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