Electron beam tube arrangements

Details Electron beam tube arrangements Electron beam tube arrangements

H - Electricity

01

J

H01J 31/00 (2006.01) H01J 23/207 (2006.01) H01J 23/38 (2006.01) H01J 23/54 (2006.01) H01J 25/04 (2006.01)

Patent

CA 2118350

An inductive output tetrode includes a cylindrical ceramic envelope 1 within which is located an electron gun including a cathode 2 and grid 3. A resonant input cavity surrounds the envelope 1 and is located adjacent the electron gun so as to provide a modulating electric field in the cathode-grid region during operation to produce density modulation of the electron beam. The cavity 7 is connected to two metal cylinders 10 and 14 arranged immediately adjacent to the outside of the envelope 1. Metallic portions 12 and 15 located within the envelope 1 are co-extensive with cylinders 10 and 14 with the material of the envelope 1 being located between them. These act as r.f. chokes to reduce high frequency losses from the cavity 7. Tuning of the resonant cavity may be achieved by adjusting a tuning member 8 which is at distance of quarter of a wavelength at the resonant frequency from the cathode-grid region.

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