Discussion
What is cross polarisation in an aperture antenna?
Answer: A
Cross polarisation is the unwanted orthogonal component generated by the antenna itself, arising from curvature of the reflector, asymmetry in an offset geometry or imperfection in the feed. It is specified as a level below the co-polar peak, and it limits how well two polarisations can reuse the same frequency. Faraday rotation is a propagation effect, coupling between antennas is isolation, and reflection depolarisation is a scattering phenomenon. The distinction between what the antenna does and what the medium does is worth keeping sharp.
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