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Coupler for coupling gyrotron whispering gallery mode RF into HE11 waveguide

  • US 8,963,424 B1
  • Filed: 01/29/2011
  • Issued: 02/24/2015
  • Est. Priority Date: 01/29/2011
  • Status: Active Grant
First Claim
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1. A coupler for a gyrotron, the coupler having:

  • a cylindrical waveguide for helically propagating Whispering Gallery (WG) mode Radio Frequency (RF) energy, the cylindrical waveguide terminating in a launch edge;

    a first mode converting reflector adjacent to said launch edge and reflecting said WG mode RF energy from said launch edge into free space quasi-Gaussian mode RF energy having an elongate amplitude profile;

    a second mode converting reflector receiving said free space quasi-Gaussian mode RF energy and having a reflection surface which generates a circularly symmetric free space quasi-Gaussian mode RF energy distribution at a distance D from said second mode converting reflector;

    a corrugated waveguide located at said distance D from said second mode converting reflector and receiving said circularly symmetric free space quasi-Gaussian mode RF energy distribution for propagation in said corrugated waveguide in an HE11 mode.

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