Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
Good catch. Thanks for the link to volvotreter.de! That's a very useful collection of articles. I've listed direct links to the Edgar article below, for easy access.
Seems to me, if a folded horn is expected to pass frequencies higher than one wavelength across its cross-section, then diagonal reflectors should be used. Rounded ducts can be used too, but then the wavefront will bounce from side to side. Rounded ducts work better if the cross-section is less than one wavelength. Far below one wavelength, the radius doesn't matter as much, and the curvature of the flare can be approximated with straight sections.
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