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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

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.
Inventors:
Issue Date:
OSTI Identifier:
1372651
Assignee:
CALABAZAS CREEK RESEARCH, INC. CHO
Patent Number(s):
9,715,988
Application Number:
14/624,245
Contract Number:
FG02-05ER84181
Resource Relation:
Patent File Date: 2015 Feb 17
Research Org:
CALABAZAS CREEK RESEARCH, INC. San Mateo, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Other works cited in this record:

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
  • Torrezan, Antonio C.; Han, Seong-Tae; Mastovsky, Ivan
  • IEEE Transactions on Plasma Science, Vol. 38, Issue 6, p. 1150-1159
  • DOI: 10.1109/TPS.2010.2046617

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