Discussion
What is the effect of the flare angle on a horn's phase distribution?
Answer: A
Because the wave in a horn spreads spherically, the path from the apex to the aperture edge is longer than to its centre, and that difference grows with the flare angle, producing a quadratic phase error that broadens the beam and fills the nulls. An optimum horn balances that error against the aperture size, which is why gain does not rise indefinitely with flare. The other options misattribute the effect to amplitude or to matching alone.
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