Analytical models for crosspolarization on earthspace radio paths for frequency range 930 GHz
Abstract
Depolarization and attenuation of radiowaves along earthspace paths due to rain storms are characterized. Frequencydependent expressions for specific attenuation and phase shift at 0 C and 20 C and for LawsParsons raindrop size distribution are given. Using small amplitude and phase approximations, a simple relation for crosspolar discrimination due to rain in terms of copolar attenuation, frequency, angle of elevation and polarization angle is derived. Expressions for depolarization due to ice crystals are given, treating them as Rayleigh scatterers of spheroidal shape. For both rain and ice the relationship between linear and circular cross polar ratio can be shown to be simply sin 2 theta, where theta is the polarization angle.
 Publication:

Annales des Telecommunications
 Pub Date:
 December 1980
 Bibcode:
 1980AnTel..35..398D
 Keywords:

 Atmospheric Effects;
 Centimeter Waves;
 Cross Polarization;
 Microwave Attenuation;
 Microwave Transmission;
 Rain;
 Spacecraft Communication;
 Depolarization;
 Ice;
 Mathematical Models;
 Phase Shift;
 Regression Coefficients;
 Communications and Radar