Discussion
What is an aperture antenna?
Answer: A
An aperture antenna is analysed by taking the electric and magnetic fields across a surface and computing the far field from them, rather than by integrating a wire current. Horns, reflectors, slots and lenses all belong to the class. The feed may be waveguide or coaxial, and the opening may be any size from a fraction of a wavelength to hundreds, so neither of the last two options is part of the definition. The distinction is one of method as much as of physical form, and it is chosen because the aperture field is easier to know than the current that produces it.
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