Patent ID: 7589469

Claim:
A coaxial waveguide converter circuit for traveling-wave tube, comprising: a waveguide; a coaxial section connected to the waveguide; an inner conductor of said coaxial section that extends into said waveguide, the inner conductor comprising: a body having a constant outer diameter; and a tapered leading end; a waveguide matching part attached to a wall of the waveguide, the waveguide matching part comprising a plurality of cantilever supports that are resilient, wherein the cantilever supports are arranged in a circular pattern such that distal ends of said cantilever supports define a fitting hole for fitting the inner conductor therein; wherein the fitting hole comprises a diameter that is larger than a diameter of the tapered leading end of the inner conductor and smaller than the outer diameter of the body of the inner conductor; wherein when the inner conductor is inserted into the fitting hole, the tapered leading end of the inner conductor contacts the distal ends of the cantilever supports that form the fitting hole such that the cantilever supports are deflected outward in a radial direction as the tapered leading end passes through the fitting hole; and wherein when the tapered leading end of the inner conductor has passed through the fitting hole, the distal ends of the cantilever supports conform to the outer diameter of the body of the inner conductor, and the distal ends of the cantilever supports remain in contact with the body of the inner conductor due to the resiliency of the cantilever supports.