Discussion
What is a conical horn?
Answer: C
A conical horn is the circular guide equivalent of the pyramidal horn, flaring a round guide out to a round mouth, and it is the natural feed for a circular aperture such as a paraboloid. Its pattern is still not perfectly symmetric in the plain form, which is why corrugated and dual mode versions were developed. A horn that tapers inward would be a transition rather than a radiator, and a continuously curved flare describes some specialised profiles rather than the basic conical shape.
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