Magnetron with improved mode separation
AssigneesHitachi, Ltd., Hitachi Device Engineering Co., Ltd., Hitachi Electronic Devices Co., Ltd.
InventorsSeiji Kitakaze, Yuichi Ito, Toshio Ogura, Tomokatsu Oguro, Iwao Umeki, Masumi Kuga
Life of this patent
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Abstract
A magnetron having eight anode vanes (2) arranged radially inside an anode cylinder (3) and a helically coiled, directly heated filament positioned along the anode cylinder. The magnetron oscillates at a basic frequency of 2450 MHz. The external diameter of the helically coiled, directly heated filament is in the range of 2.6 to 3.2 mm, and the diameter between the internal ends of the anode vanes is in the range of 7.0 to 8.0 mm.
Claims17
A magnetron, comprising:
- an anode cylinder,
- eight vanes extending radially inwardly from said anode cylinder,
- a helically coiled, directly heated filament extending along a center axis of said anode cylinder, and
- an antenna lead having a first end connected to an axial end of one of said eight vanes on a first axial end side thereof and a second end connected to an antenna,
- whereby said magnetron oscillates at a basic frequency of 2450 MHz,
- wherein said helically coiled, directly heated filament has an external diameter in the range of 2.6 to 3.2 mm, and the internal ends of said eight vanes define a diameter in the range of 7.0 to 8.0 mm.
A magnetron comprising:
- an anode cylinder;
- eight vanes extending radially inwardly from said anode cylinder,
- a helically coiled, directly heated filament extending along a center axis of said anode cylinder,
- an antenna, and
- an antenna lead having a first end connected to an axial end of one of said eight vanes on a first axial end side thereof and a second end connected to said antenna,
- whereby said magnetron oscillates at a basic frequency of 2450 MHz,
- wherein the ratio F/G of an external diameter F of said helically coiled, directly heated filament to a diameter G defined by the internal ends of said eight vanes is in the range of 0.32 to 0.46, and said helically coiled, directly heated filament has an external diameter in the range of 2.6 to 3.2 mm.
A magnetron comprising:
- an anode cylinder;
- eight vanes extending radially inwardly from said anode cylinder,
- a helically coiled, directly heated filament extending along a center axis of said anode cylinder,
- an antenna,
- an antenna lead having a first end connected to an axial end of one of said eight vanes on a first axial end side thereof and a second end connected to said antenna, and
- strap rings electrically connecting said eight vanes alternately only at said first axial end side thereof,
- whereby said magnetron oscillates at a basic frequency of 2450 MHz,
- wherein the ratio F/G of an external diameter F of said helically coiled, directly heated filament to a diameter G defined by the internal ends of said eight vanes is in the range of 0.32 to 0.46, and the ratio H/G of an internal diameter H of said anode cylinder to said diameter G is in the range of 4.5 to 5.0.
Dependencies are inferred from the claim text.