Discussion
Why is a horn a better radiator than an open ended waveguide?
Answer: A
The flare enlarges the aperture, raising the gain, and grades the impedance from the guide to free space, reducing the reflection. Higher order modes are in fact generated by the flare, the horn is itself the matching section, and its patterns in the two planes differ unless the design is corrugated or otherwise corrected. Two benefits from one geometric change is a common pattern in antenna design and is worth noticing when it occurs.
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