Discussion
Why does an offset reflector generally have worse cross polarisation than a symmetric one?
Answer: B
In a symmetric reflector the cross polar contributions from opposite sides cancel, whereas the offset geometry destroys that symmetry and leaves a residual cross polar lobe. Using a matched feed or a dual reflector arrangement recovers much of the performance. Feed tilt is part of the same geometry rather than a separate cause, absence of blockage does not create the lobes, and the path lengths are equalised by the surface shape. It is the price paid for removing blockage, and it is usually worth paying.
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