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[1] We use the Mie scattering approach and the dielectric model of Liebe to determine the propagation coefficients and rain attenuation distribution for four locations in Botswana, southern Africa, using R 0.01 = 68.9 mm/h for Gaborone, R 0.01 = 137.06 mm/h for Selebi-Phikwe, R 0.01 = 86.87 mm/h for Francistown, and R 0.01 = 64.4 mm/h for Kasane over the frequency range of 1-1000 GHz. The results show that the extinction coefficients depend more strongly on temperature at lower frequencies than at higher frequencies for lognormal distribution. The absorption coefficient is significant but decreases exponentially with rain temperature at lower microwave frequencies. The application of the proposed model with various distributions is corroborated using practical results for Durban in South Africa.Citation: Mulangu, C. T., and T. J. Afullo (2009), Variability of the propagation coefficients due to rain for microwave links in southern Africa, Radio Sci., 44, RS3006,

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The multipath model uses in powerline communication channel (PLC) is based on a parametric model where many parameters can be estimated only after measurement of the PLC impulse response, thus limiting the capability of a priori channel modelling. Zimmermann model proposed after measurements, attenuation parameters in the frequency range of 500 kHz to 20 MHz. Mie scattering approach is applied on scattering points of the channel and the attenuation is derived. Also, the power law is applied to derive analytical attenuation parameters in a wide frequency range starting from 10 MHz to 3 GHz.