Discussion
Why does rain also cause depolarisation?
Answer: D
Large raindrops flatten as they fall and tend to align, presenting different attenuation and phase to horizontal and vertical polarisation, so a dual polarised system loses isolation. That matters most where frequency reuse depends on cross polar discrimination. Reflection, bulk birefringence and antenna wetting are not the mechanism, though a wet radome adds loss of its own. A scatterer whose shape and orientation are not random will always couple energy between polarisations.
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