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Gyrotron whispering gallery mode coupler with a mode conversion reflector for exciting a circular symmetric uniform phase RF beam in a corrugated waveguide

United States Patent

9,715,988
July 25, 2017
View the Complete Patent at the US Patent & Trademark Office
A cylindrical waveguide with a mode converter transforms a whispering gallery mode from a gyrotron cylindrical waveguide with a helical cut launch edge to a quasi-Gaussian beam suitable for conveyance through a corrugated waveguide. This quasi-Gaussian beam is radiated away from the waveguide using a spiral cut launch edge, which is in close proximity to a first mode converting reflector. The first mode converting reflector is coupled to a second mode converting reflector which provides an output free-space HE11 mode wave suitable for direct coupling into a corrugated waveguide. The radiated beam produced at the output of the second mode converting reflector is substantially circular.
Neilson; Jeffrey M. (Redwood City, CA)
CALABAZAS CREEK RESEARCH, INC. (San Mateo, CA)
14/ 624,245
20170005386
February 17, 2015
The present invention was developed with the U.S. Department of Energy under grant DE-FG02-05ER84181. The government has certain rights in this invention.