Magnetrons having a coaxial line output with unwanted mode energy reduction
AssigneeE2V Technologies (UK) Limited
InventorsKesar Saleem, Alan Hugh Pickering, Michael Barry Clive Brady
Life of this patent
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Abstract
A magnetron has an output comprising a coaxial line 15 which transmits energy from a wanted oscillator mode as a first coaxial waveguide mode and energy from an unwanted oscillator mode as a second cylindrical waveguide mode. Energy in the cylindrical waveguide mode is intercepted by slots 17, 18 in the coaxial line 15 and absorbed by material 10. This enables the modes to be separated. Preferably, the output is taken from the axis of the magnetron and the wanted oscillator mode is the π mode.
Claims20
A magnetron comprising:
- an anode having resonant cavities and coaxially arranged with a cathode about a longitudinal axis;
- output means including a coaxial line configured to receive energy in one oscillator mode and transmit said one mode as a coaxial transmission mode and to receive energy in another oscillator mode and transmit said another mode as a cylindrical waveguide mode;
- and means for at least reducing transmission of energy along the coaxial line in the cylindrical waveguide mode wherein the coaxial line is arranged to receive energy coupled in an axial direction substantially parallel to the longitudinal axis from the resonant cavities;
- wherein the coaxial line has at least one axially extensive slot extending through an outer conductor through which energy in the cylindrical waveguide mode is coupled from the coaxial line.
A magnetron as claimed in any preceding claim and including at least one axially extensive reflector slit in the output means for reflecting energy from said another oscillator mode back towards the resonant cavities.
A magnetron comprising:
- an anode having resonant cavities and coaxially arranged with a cathode about a longitudinal axis;
- output means including a coaxial line configured to receive energy in one oscillator mode and transmit said one mode as a coaxial transmission mode and to receive energy in another oscillator mode and transmit said another mode as a cylindrical waveguide mode;
- and means for at least reducing transmission of energy along the coaxial line in the cylindrical waveguide mode wherein the coaxial line is arranged to receive energy coupled in an axial direction substantially parallel to the longitudinal axis from the resonant cavities said magnetron further including a second coaxial line arranged to receive energy in said another oscillator mode coupled in the axial direction from the end of the anode where a cathode lead is located and transmit the energy as a cylindrical waveguide mode.
Dependencies are inferred from the claim text.