It is common that the polarization purity of EM wave will be deteriorated when the propagation environment is to be free space (with obstacles). So, is there any device to preserve the polarization purity of signal at least to a reasonable level (which is supposed to take its propagation in free space).
A.C. Marvin
The polarisation of an em wave propagating in free space will be maintained. De-polarisation happens when the wave encounters a change in the free space environment. This could be a scattering object, for example a raindrop, or a change in the local propagation parameters due to changes in the atmosphere including the ionosphere. There is no single device that can stop this.
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