Accession Number : ADD008854

Title :   Waveguide Mode Coupler for Use with Gyrotron Traveling Wave Amplifiers.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Barnett,Larry R

Report Date : 04 Aug 1981

Pagination or Media Count : 6

Abstract : This report describes a rectangular waveguide to circular waveguide coupler and vice versa. The coupler includes a first section of circular waveguide spaced by a gap from a reflective-plane conducting wall, the latter having a hole for passage of an electron beam if the coupler is used in a traveling wave tube, and a second section of circular waveguide disposed external to, and coaxial with, at least a portion of the first waveguide section and extending to the wall to provide a conductive boundary surrounding the gap. The region between the first and second waveguide sections forms an input port of the coupler; the first waveguide section forms the output port of the coupler. Electromagnetic waves in a TE sub 01 coaxial waveguide mode are applied to the input port from a rectangular waveguide supporting the dominant TE sub 10 mode. The second waveguide section has a cut-off determining dimension r sub e proportioned to support both the TE sub 01 and TE sub 02 circular electric modes in the region of the gap at the frequency of the applied waves. The first waveguide section has cut-off determining dimensions r sub 1 proportioned to support the circular electric TE sub 01 mode to the exclusion of all higher-numbered circular electric modes at the frequency of the applied waves. (Author)

Descriptors :   *Patents, *Waveguide couplers, *Traveling wave tubes, Electron beams, Electromagnetic radiation, Rectangular bodies, Ports(Openings), Boundaries, Input, Waveguides, Couplers, Circular, Output, Waves, Conductivity

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE