Patent ID: 8324809

Claim:
A microwave tube including: an electronic gun capable of producing an electronic beam in the form of a hollow axisymmetrical cylinder in repetitive operation, a body, in which the beam is intended to propagate, the body ending with a collector and being provided with means for applying an axial magnetic field for guiding the beam and downstream from the collector, with a resonant structure crossed by the beam, intended to group the electrons into a succession of packets (p), characterized in that the resonant structure intended for grouping the electrons into the succession of packets (P) is unique and is formed with two coupled cavities which follow along the axis (Z) of the beam, the coupling being achieved via an interactivity region crossed by the beam, this structure having axial symmetry, the axis of which is that of the beam and being dimensioned so that the transformation of the electrons into packets is accomplished at a frequency which is that of the π resonant mode of the resonant structure.