Discussion
Which of these is an aperture antenna?
Answer: D
A parabolic reflector is analysed from the field across its opening and so belongs to the aperture class, along with horns, slots and lenses. Dipoles, loops and whips are wire antennas whose radiation is computed from the current along a conductor. The two classes are not different physics but different bookkeeping, chosen according to which quantity is easier to write down, and recognising which applies is the first step in tackling any antenna problem.
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