Coupler for coupling gyrotron whispering gallery mode RF into HE11 waveguide

Neilson, Jeffrey M

Title: Coupler for coupling gyrotron whispering gallery mode RF into HE11 waveguide

Patent · Tue Feb 24 00:00:00 EST 2015

OSTI ID:1170738

Neilson, Jeffrey M

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.

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Research Organization:: Calabazas Creek Research, Inc., San Mateo, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: FG02-05ER84181

Assignee:: Calabazas Creek Research, Inc. (San Mateo, CA)

Patent Number(s):: 8,963,424

Application Number:: 13/016,995

OSTI ID:: 1170738

Resource Relation:: Patent File Date: 2011 Jan 29

Country of Publication:: United States

Language:: English

References (13)

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A shaped-reflector high-power converter for a whispering-gallery mode gyrotron output Lorbeck, J. A.; Vernon, R. J. IEEE Transactions on Antennas and Propagation, Vol. 43, Issue 12 https://doi.org/10.1109/8.475926	journal	January 1995
Gyrotron beam coupling method into corrugated waveguide Oda, Yasuhisa; Kajiwara, Ken; Takahashi, Koji 2009 34th International Conference on Infrared, Millimeter, and Terahertz Waves (IORMMW-THz 2009) https://doi.org/10.1109/ICIMW.2009.5325674	conference	September 2009
Surface integral equation analysis of quasi-optical launchers Neilson, J. M.; Bunger, R. IEEE Transactions on Plasma Science, Vol. 30, Issue 3 https://doi.org/10.1109/TPS.2002.801629	journal	June 2002
Optimization of Quasi-Optical Launchers for Multifrequency Gyrotrons Neilson, Jeffrey M. IEEE Transactions on Plasma Science, Vol. 35, Issue 6 https://doi.org/10.1109/TPS.2007.908910	journal	December 2007
Couplers for extracting RF power from a gyrotron cavity directly into fundamental mode waveguide Ives, Robert Lawrence; Jory, Howard R.; LaRue, Albert D. https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5015914 US Patent Document 5,015,914	patent	May 1991
Compact waveguide converter apparatus Moeller, Charles P. https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5030929 US Patent Document 5,030,929	patent	July 1991
Gyrotron having a quasi-optical mode converter Ito, Yasuyuki https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5187409 US Patent Document 5,187,409	patent	February 1993
Gyrotron including quasi-optical mode converter Sakamoto, Keishi; Nagashima, Takashi; Mitsunaka, Yoshika https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5266868 US Patent Document 5,266,868	patent	November 1993
Method of converting transverse electrical modes and a helically outlined aperture antenna for implementing the method Mobius, Arnold; Thumm, Manfred https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5266962 US Patent Document 5,266,962	patent	November 1993
Quasi-optical coupler with reduced diffraction Krieg, Jean-Michel; Iatrou, Christos https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5652554 US Patent Document 5,652,554	patent	July 1997
Gyrotron capable of outputting a plurality of wave beams of electromagnetic waves Hirata, Yosuke; Komuro, Mitsuo; Mitsunaka, Yoshika https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5719470 US Patent Document 5,719,470	patent	February 1998
Mode converter and gyrotron tube provided with mode converter for converting mode of millimeter waves Sakamoto, Keishi; Kasugai, Atsushi; Mitsunaka, Yoshika https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6476558 US Patent Document 6,476,558	patent	November 2002

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