Abstract
This paper investigates the in∞uence of critical raindrop diameters on the speciflc rain attenuation in Durban (29 - 52 0 S, 30 - 58 0 E), South Africa. The total rainfall attenuation is evaluated by integrating over all the raindrop sizes and the difierential change in the attenuation is observed over a given range of drop size diameters. The major contribution to the speciflc attenuation for the drop size distribution (DSD) models considered is created by the raindrop diameters not exceeding 2mm especially at higher frequencies. The three parameter lognormal and gamma distribution models are employed for the purpose of analysis. For the DSD models considered in this work, the total percentage fraction created by raindrops in the diameter range 0:5mmD • 2:5mm and 1mmD • 3mm to the total speciflc attenuation is found to be critical for the overall and seasonal rainfall attenuation at 2.5GHz{ 100GHz in Durban. It is observed that the total speciflc attenuation increases with increased frequencies and a higher rainfall rate produces high rain attenuation. In this paper, both the overall and seasonal values of R0:01 determined for Durban are used.
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