Discussion
Why is a dual mode horn narrower in bandwidth than a corrugated one?
Answer: C
The symmetry depends on the two modes arriving at the aperture with a particular relative phase, and since they travel at different velocities that relationship holds over only a modest band. Corrugations impose the boundary condition directly and so work over a wider range. Step reflection is a small effect, the higher mode is above cutoff by design, and aperture size affects gain rather than symmetry. Any technique relying on a phase relationship between two propagating modes is narrowband for the same reason.
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