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Microwave propagation mode transformer

  • US 4,636,689 A
  • Filed: 03/14/1984
  • Issued: 01/13/1987
  • Est. Priority Date: 03/18/1983
  • Status: Expired due to Fees
First Claim
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1. A gyrotron which includes means forming an electron beam along a beam axis, a circular cavity into which the beam is projected for interacting with electromagnetic wave energy and creating oscillating wave energy in the cavity, an output wave guide essentially rectangular in cross section in which the electric field is parallel to the major wall of the guide, and an intermediate mode conversion means having one end coupled to the cavity and the other end coupled to the output wave guide comprising a transforming wave guide essentially elliptic in cross section whose eccentricity varies from about zero at said one end to about one at said other end and having a pair of mirrors oppositely disposed along the axis of the beam with openings therebetween, a pair of beam collectors oppositely disposed along the axis of beam at said openings, and means for directing the electron beam after it has traversed the cavity through said openings onto said collector means.

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