Assuming a perfect circulary polarized radar system, the cancellation ratio limitations were evaluated using the Sekine-Lind rain-drop distribution. Numerical methods were used and the cancellation limitation was plotted against rainfall rate for various wind velocities.

The rain attenuation in the frequency range from 1 to 1000 GHz was calculated by using the Laws-Parsons, Sekine-Lind and Ihara-Furuhama-Manabe distributions for raindrop-size. The results were compared with the recent microwave measurements from 8 to 312.5 GHz at the rain rate R50 mm/hr. The Laws-Parsons distribution has a good agreement with the measurements, while up to 100 GHz, the Sekine-Lind distribution leads to more attenuation than the Laws-Parsons distribution and above 100 GHz, the Ihara-Furuhama-Manabe distribution gives more attenuation than the Laws-Parsons distribution.