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

Patent ·
OSTI ID:1372651

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.

Research Organization:
CALABAZAS CREEK RESEARCH, INC. San Mateo, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG02-05ER84181
Assignee:
CALABAZAS CREEK RESEARCH, INC.
Patent Number(s):
9,715,988
Application Number:
14/624,245
OSTI ID:
1372651
Resource Relation:
Patent File Date: 2015 Feb 17
Country of Publication:
United States
Language:
English

References (8)

Couplers for extracting RF power from a gyrotron cavity directly into fundamental mode waveguide patent May 1991
Compact waveguide converter apparatus patent July 1991
Optical apparatus for conversion of whispering-gallery modes into a free space gaussian like beam patent May 1992
Method of converting transverse electrical modes and a helically outlined aperture antenna for implementing the method patent November 1993
Coupler for coupling gyrotron whispering gallery mode RF into HE11 waveguide patent February 2015
Mode converter and gyrotron tube provided with mode converter for converting mode of millimeter waves patent-application February 2002
Optical coupling for whispering-gallery-mode resonators via waveguide gratings patent-application July 2005
Continuous-Wave Operation of a Frequency-Tunable 460-GHz Second-Harmonic Gyrotron for Enhanced Nuclear Magnetic Resonance journal June 2010

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