Frequency scaling of depolarisation at centimetre and millimetre waves

A frequency scaling relation for the prediction of depolarisation statistics at centimetre and millimetre waves is derived by calculating the forward-scattering amplitudes of the Pruppacher-Pitter type raindrops at 33 frequencies from 3 to 40 GHz. The dependence of the frequency scaling relation on raindrop-size distributions is also discussed.