When the ratio of waveguide diameter to wavelength is not too large, bends can be negotiated with low loss in continuous bends with special curvature. Some examples:
high power 30o continuous curvature bends in 31.75 mm waveguide for HE11 mode at 110 GHz
high power 90o continuous curvature bend in 44.5 mm waveguide for TE01 mode at 11.4 GHz
high power 90o continuous curvature bends in 44.5 mm waveguide for HE11 mode at 28 GHz (1)
high power 90o continuous curvature bends in 44.5 mm waveguide for HE11 mode at 28 GHz (2)
Ray O’Neill, GA-ITER Program oneill@fusion.gat.com (858) 909-5214
John Doane, GA-MFE Technologies doane@fusion.gat.com (301) 362-9097