Discussion
Why does an element longer than resonance act as a reflector?
Answer: C
Above resonance a dipole is inductive, so the current induced in it lags the driving field, and the re-radiated wave adds forward and subtracts backward. A shorter, capacitive element does the opposite and acts as a director. Nothing is absorbed and re-emitted in a directed sense, the element radiates perfectly well off resonance, and the extra interception is negligible. The whole design of a parasitic array rests on this relationship between element length and re-radiated phase.
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