Rain Attenuation at THz Frequencies from Historical Data Collected in Brasilia, Brazil

This paper proposes a case study for estimating rain attenuation with rainfall data collected in Brasilia, Brazil at THz frequencies using Mie Theory and Drop Size Distribution. To address this goal, we used measured rainfall rate data for the past 18 years collected at the National Institute of Meteorology (INMET). A statistical approach that uses Monte Carlo simulation was applied to obtain a reasonable estimation of rainfall attenuation in the terahertz spectrum. To evaluate the accuracy of the method, we performed a comparison between the rain attenuation calculated by Mie Theory and ITU-R model. The estimation proposed in this work showed that the mean attenuation varies between 1.7 to 3.5 dB/km. For rain events higher than 10 mm/h, results showed that the mean attenuation varies between 8 to 18 dB/km.