Frequency domain scattering loss on small particles in terahertz frequency band (0.1–10 THz) is addressed. The wavelengths in THz band are short enough to enable scattering on small particles in the atmosphere. Rayleigh theories are utilized in estimating the scattering loss and it is shown that in proper conditions small particle scattering causes significant losses in the THz band. The small particle scattering is mainly an issue on the higher end of the THz band. This is due to the strong frequency dependency of the scattering. The effect of the scattering loss to the received signal strength is shown in the results.
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