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Gyrotron Whispering Gallery Mode Coupler With Phase Correcting Mirrors and Launcher For Direct Coupling of RF into HE11 Waveguide

United States Patent Application

*** PATENT GRANTED ***
20170005386
9,715,988
A1
View the Complete Application 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
February 17, 2015
[0002] 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.