Discussion
What is an optimum horn?
Answer: B
An optimum horn is proportioned so that the gain from the enlarged aperture just balances the loss from the quadratic phase error, usually at a permitted edge phase error of about a quarter or half a wavelength. Making it longer for the same mouth would reduce the phase error but is often impractical. Perfect matching, equal beamwidths and zero phase error are desirable properties achieved by other means. Optimising a product of two competing effects is a pattern seen throughout aperture design.
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