Microwave wave generator device with a virtual cathode oscillator and axial geometry, comprising at least one reflector and a magnetic ring, configured to be supplied by a high-impedance generator

A microwave wave generator device with a virtual cathode oscillator and axial geometry, the device comprising

• a cathode, a thin anode and a cylindrical wave guide, of longitudinal axis (z) and radius (RG), having a first end forming an entrance to the cylindrical wave guide and a second end forming an exit from the cylindrical wave guide, the cathode upstream of the entry to the cylindrical wave guide and configured to emit electrons, and the thin anode at the entrance to the cylindrical wave guide, between the cathode and the cylindrical wave guide, and
• further comprising at least a first reflector in the wave guide, transparent to electrons and configured to reflect a microwave wave created by at least one virtual cathode generated in the wave guide,
• the device further comprising a narrow magnetic ring of width (LM) along the longitudinal axis (z), externally around the cylindrical wave guide at a distance (dAM) from the thin anode and with the first reflector at a distance (dAF1) from the thin anode beyond the magnetic ring, such that the magnetic ring is between the thin anode and the first reflector, wherein the magnetic ring is configured to generate a magnetic field adapted to brake the electrons and to create an accumulation of charge at the origin of a non-oscillating virtual cathode between the thin anode and the first reflector.