Title:
MAGNETRON
Document Type and Number:
Japanese Patent JP3683381
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress the level of spurious radiation to be low, and secure stable operation without using any additional component such as a spurious reducing filter or the like.
SOLUTION: In an anode 10 arranged in the center portion of a cathode 3, plural radial vanes B1, B19 and annular straps S1 to S4 are arranged as a resonator structure. In such an anode 10, by spreading the space volume of an end space 15 up to 1.0 cm3, the resonance frequency of a (π-1) mode (higher order mode) is adjusted so as to be in a range of π mode frequency ±300 MHz. This frequency shift can be executed by such a method as changing the cut positions of the straps S1 to S4, bending the end portions of the cut portions, or the like. Preferably, the resonance of the (π-1) mode is coupled with an external circuit in coupling coefficient β:0.2 or more, and in sharpness QL:75 or more.
Inventors:
Wakamatsu
Toshihiko Yamashita
Toshiya Machida
Hideyuki Obata
Toshihiko Yamashita
Toshiya Machida
Hideyuki Obata
Application Number:
JP15015497A
Publication Date:
August 17, 2005
Filing Date:
May 22, 1997
Export Citation:
Assignee:
New Japan Radio Co., Ltd.
International Classes:
H01J23/22; H01J23/20; (IPC1-7): H01J23/20; H01J23/22
Domestic Patent References:
| JP4118835A |
Attorney, Agent or Firm:
Yasuto Ogata
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