| 摘要 |
A magnetron comprises a cathode 5, an anode 2 having at least one vane 3, which defines a plurality of cavities. A dielectric resonator 7 is located between the vane(s) 3 and magnetic pole-piece 6a, such that it is in communication with said vane(s). The di-electric resonator 7 comprises a portion 8 of dielectric material, preferably a ceramic such as alumina, and a portion 9 of lossy material such as a carbon-loaded ceramic. A further conductive portion (15, figure 3) may be interposed between the two sections 8 and 9 of the resonator 7. In use the dielectric resonator 7 at least partially absorbs spurious radiation generated in a predetermined mode of operation of the magnetron, preferably the pi-1 mode, which if transmitted may interfere with other electronic devices.
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