Discussion
What happens if a reflector feed is displaced laterally from the focus?
Answer: B
A lateral offset tilts the emerging wavefront, so the beam squints away from the axis, and coma lobes appear as the displacement grows. Several beamwidths of scan are possible before the degradation becomes unacceptable, which is the basis of multibeam reflector antennas serving several coverage areas from one dish. Axial displacement, by contrast, defocuses and broadens the beam without steering it. Distinguishing the two kinds of feed displacement explains most reflector misalignment symptoms.
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