Discussion
How can circular polarisation be produced from two linear elements?
Answer: D
Two orthogonal elements fed with equal amplitude and ninety degrees of phase difference produce a field whose vector rotates once per cycle, which is circular polarisation. Any departure from equal amplitude or from quadrature gives an ellipse instead. Feeding in phase gives a linear polarisation at forty-five degrees, which is what the last option describes as well. Helical antennas achieve the same end geometrically, by winding the conductor rather than by splitting the feed.
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