Computation of rain attenuation in tropical region with multiple scattering and multiple absorption effects using exponential drop size distribution

Rain attenuation causes scattering and absorption of electromagnetic waves and could be a significant problem in radio propagation, especially in tropical region which has high rainfall rate. In this paper, raindrop was modeled using exponential raindrop size distribution and computed with multiple scattering and multiple absorption effect previously derived. It was assumed that raindrop shape is spherical and has dielectric constant following the Double Debye Model. Based on the analysis, rain attenuation effects become significant for frequencies above 10 GHz and reach the peak at about 125 GHz. Other important results are also reported.