Discussion
How does the polarisation of a slot compare with that of its complementary dipole?
Answer: A
The duality interchanges the electric and magnetic fields, so a horizontal slot radiates vertical polarisation and a vertical slot horizontal. The pattern shape is the same, which is the source of the confusion. Nothing becomes circular, and reversal of sense applies to circular polarisation rather than to linear. Remembering that the slot is the magnetic dual of the dipole predicts both this rotation and the impedance relation without any further work.
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