Magnetron for which leakage of H.F. noise is minimized
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorNorio Tashiro
Life of this patent
Estimating the term…
Abstract
A high frequency electromagnetic energy absorber disposed near a cathode holder in an evacuated envelope of a magnetron so as to attenuate high frequency noise leaking through the cathode terminal of the magnetron. The absorber is in thermal contact with a member connected to the anode cylinder of the tube to conduct heat generated in the tube, whereby overheating of the tube can be prevented. By combining the absorber with another high frequency attenuating element, the attenuating effect can be increased.
Claims18
A magnetron comprising:
- an anode cylinder having one or more resonant cavities defined therein;
- a cathode having an end and located on the axis of the anode cylinder;
- a cathode holder supporting the cathode at the end of the cathode and extending in the direction thereof;
- magnetic means for providing a magnetic field substantially parallel to the axis in an interaction space defined between the resonant cavities and the cathode and the cathode holder;
- an evacuated envelope member hermetically sealed with the anode cylinder and constituting an evacuated envelope in cooperation with the anode cylinder;
- a heat conducting member connected thermally to the anode cylinder and located in the vicinity of the cathode holder;
- and
- a high-frequency energy absorber located close to the cathode holder in an evacuated area defined by the evacuated envelope and being in contact thermally with the heat conducting member, wherein the high-frequency energy absorber is shielded against a magnetic flux generated from the magnetic means.
A magnetron according to claim 6 wherein the high-frequency energy absorber is made of ferrite.
A magnetron comprising:
- an anode cylinder having one or more resonant cavities defined therein;
- a cathode having an end and located on the axis of the anode cylinder;
- a cathode holder supporting the cathode at the end of the cathode and extending in the direction thereof;
- magnetic means for providing a magnetic field substantially parallel to the axis in an interaction space defined between the resonant cavities and the cathode and the cathode holder;
- an evacuated envelope member hermetically sealed with the anode cylinder and constituting an evacuated envelope in cooperation with the anode cylinder;
- a heat conducting member connected thermally to the anode cylinder and located in the vicinity of the cathode holder;
- and
- a high-frequency energy absorber located close to the cathode holder in an evacuated area defined by the evacuated envelope and being in contact thermally with the heat conducting member, wherein a high-frequency wave shield is provided between the resonant cavities and the space where the high frequency energy absorber is located.
Dependencies are inferred from the claim text.