Oscillators – With magnetically controlled space discharge device – With undesired mode suppression or selection means
Reexamination Certificate
2006-01-10
2006-01-10
Kinkead, Arnold (Department: 2817)
Oscillators
With magnetically controlled space discharge device
With undesired mode suppression or selection means
C331S086000, C315S039510, C315S039530, C313S333000, C219S761000, C219S702000
Reexamination Certificate
active
06985042
ABSTRACT:
The object to the present invention is to provide a magnetron which can reduce spurious oscillation such as the π−1 mode which presents a problem particularly in magnetrons and can reduce spurious radiations without placing filters. The magnetron of the present invention includes an anode1formed by plural vanes12in such a manner that inner ends12are radially extended toward the center of the anode shell11from the inner wall of a cylindrical anode shell, and a cathode2provided at the center of the anode1. The magnetron of the present invention further includes a pair of pole pieces4provided in such a manner that a magnetic field can be applied on the interaction space2where the inner ends12aof the vanes12and the cathode2face with each other. At least one of the pair of pole pieces is provided in such a manner that in a range A at least ⅓ of the vane length L from the inner end12aof the vane, the distance B between the side surfaces12bof the vanes and the surface4badjacent the inner end4aof the pole pieces4is within 0.015 λ wherein λ is the oscillation wavelength of the magnetron, and said vane length is a distance from said one end to said inner end.
REFERENCES:
patent: 4855645 (1989-08-01), Kinuno et al.
patent: 5049782 (1991-09-01), Aiga et al.
patent: 5635798 (1997-06-01), Ogura et al.
patent: 0 797 234 (1997-09-01), None
patent: 6-290712 (1994-10-01), None
Copy of Great Britain Patent Office Action with Search Report for corresponding Great Britain Patent Application No. GB 0322495.3 dated Mar. 26, 2004.
Obata Hideyuki
Tsuji Naoki
Armstrong Kratz Quintos Hanson & Brooks, LLP
Kinkead Arnold
New Japan Radio Co. Ltd.
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