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US 4,377,770 AGranted
Microwave delay line incorporating a conductor with a variable cross-section for a travelling-wave tube
AssigneeThompson-CSF
InventorGeorges Fleury
Life of this patent
Estimating the term…
Abstract
A helical microwave delay line for a travelling-wave tube, constituted by a conductor held in the envelope of the tube by insulating bars. The width of the conductor in contact with the supporting bars increases along the tube axis, particularly towards the microwave energy output.
Claims8
A travelling-wave tube comprising in a vacuum envelope;
- an electron gun for producing an electron beam;
- a delay line substantially co-axial with the electron beam for propagating a microwave interacting with said beam between an input and output of the tube, said delay line comprising a substantially helical shaped conductor, the cross section of which is greater at the output end of the helix than at the input end, and the increase occurs gradually with the turns closer to the output wherein the output turns are equal to or larger than the preceding turns, and with at least one fourth of the turns of the helix being greater in cross-section than those of the smallest turns.
A travelling wave tube comprising in a vacuum envelope;
- an electron gun for producing an electron beam;
- a delay line substantially coaxial with the electron beam for propagating a microwave interacting with said beam between an input and an output of the tube;
- said delay line comprising a substantially helical shaped conductor whose cross-section area on the outer surface thereof is greater at the output end of the helix than at the input end, and the increase occurs gradually with the turns closer to the output wherein the output turns are equal to or larger than the preceding turns, and with at least one fourth of the turns of the helix being greater in cross section than those of the smallest turns.
Dependencies are inferred from the claim text.