Discussion
What is a pyramidal horn?
Answer: B
The pyramidal horn flares in both the E and H planes, giving a rectangular mouth and a pencil beam. It is the commonest laboratory and reference horn and the usual gain standard. Circular cross section gives the conical horn, corrugations give the hybrid mode horn, and dual polarised feeds are a separate refinement that may be applied to several of these shapes. The geometry is simple enough that its gain can be computed accurately from its dimensions, which is why it became the standard.
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