Discussion
How is an ordinary end fire array excited?
Answer: B
Making each element lag its neighbour by exactly the propagation delay between them means the contributions arrive together along the array axis, so the beam points end fire. For half wavelength spacing that is a hundred and eighty degree step. In phase feeding gives broadside, and the amplitude options describe tapering rather than steering. The whole of beam steering is contained in this idea of compensating the path difference with a feed phase. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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