Coaxial magnetron using the TE.sub.111 mode
AssigneeVarian Associates, Inc.
InventorAlfred W. Cook
Life of this patent
Estimating the term…
Abstract
A coaxial magnetron has a high-Q resonant cavity surrounding a multiple-resonator anode circuit and coupled by slots to alternate anode resonators. The cavity is resonant in the TE.sub.111 mode, having two zero points of electric field on its periphery. The anode circuit is correspondingly resonant in its N/2-1 mode. Mode suppression means damp out the degenerate TE.sub.111 mode which is not coupled to the output iris. The size and weight of the magnetron are much less than conventional tubes using a cavity resonant in the TE.sub.011 mode with circular electric field.
Claims11
A magnetron oscillator comprising:
- a generally cylindrical electron-emitting cathode,
- an anode insulated from and surrounding said cathode, the inner surface of said anode facing said cathode being generally a cylinder coaxial with said cathode, said anode having a plurality of gaps parallel to the axis of said cylinder, a plurality of resonant chambers in said anode in wave-transmissive connection with said gaps,
- a resonant cavity surrounding said anode,
- a plurality of apertures in the wall between alternate ones of said chambers and said cavity for mutual coupling,
- means for extracting electromagnetic wave energy from said cavity, and
- means for causing said cavity to resonate at approximately the resonate frequency of said anode chambers in an operating mode having electric field perpendicular to said axis, one cyclic variation of said electric field strength over a path going around said anode, and one cyclic variation over a path going across said cavity generally parallel to said axis.
A magnetron oscillator comprising
- a generally cylindrical electron-emitting cathode,
- an anode insulated from and surrounding said cathode, the inner surface of said anode facing said cathode being generally a cylinder coaxial with said cathode, said anode having a plurality of gaps parallel to the axis of said cylinder, a plurality of resonant chambers in said anode in wave-transmissive connection with said gaps, and
- a resonant cavity surrounding said anode,
- said cavity having an outer wall surrounding said anode and the distance from the outer surface of said anode to the inner surface of said outer wall being less than one-half of the free-space wavelength of a wave at the frequency of resonance of said anode chambers.
A magnetron oscillator comprising
- a generally cylindrical electron-emitting cathode,
- an anode insulated from and surrounding said cathode, the inner surface of said anode facing said cathode being generally a cylinder coaxial with said cathode, said anode having a plurality of gaps parallel to the axis of said cylinder, a plurality of resonant chambers in said anode in wave-transmissive connection with said gaps,
- a resonant cavity surrounding said anode,
- means for extracting electromagnetic wave energy from said cavity, and
- means for locking said cavity to resonate in an operating TE.sub.111 mode with a maximum of electric field at an azimuthal location approximately 90 degrees from said means for extracting wave energy.
Dependencies are inferred from the claim text.