Studies on Rain Induced Attenuation Phase Shift and Scattering Coefficient at Millimeter Wavelengths During Tropical Rainfall

Abstract

The paper deals with the effect of the rain drop size distribution on rain induced attenuation and a comparison is made between the theoretical prediction of attenuation and phase dispersion. The results show how the refractive indices change at different mm wavelengths at 20°C. The frequency spectrum indicates that in the range 0.05 cm—0.3 cm dropsize the scattering amplitude values follow a systematic relation while for larger drop diameter the variation is irregular. In the analysis emphasis is also laid to the differential attenuation values and the results' are compared on the basis of recently prediction method proposed by the International Radio Consultative Committee (CCIR) besides the existing models for the prediction of attenuation by rain.

Indexing terms:

• Rain attenuation
• Phase dispersion
• Scattering coefficient
• Tropical rainfall