| 摘要 |
The object of the invention is to provide a depressed collector which captures the spent electrons of a microwave transmitting tube at high efficiency in both high and low power modes of operation. The collector comprises entrance and end electrodes (14 and 18, respectively), electrode (18) having a spike extending toward entrance electrode (14). Intermediate electrodes (15, 16 and 17) and the entrance electrode (14) each have a central aperture and, together, these electrodes capture most high power mode spent electrons. The apertures of the electrodes (14-17) increase in size in a downstream direction. To capture low power mode spent electrons a low power mode electrode (19) is positioned between the last intermediate electrode (17) and the end electrode (18). This electrode (19) has a central aperture preferably smaller but no larger than that of electrode (17). An auxiliary low power mode electrode 20 may be disposed between electrodes 19 and 18 and has a central aperture larger than that of the low power mode electrode (20). All of the electrodes 14-20 are at voltages provided by a voltage divider 21 connected between a potential as at a negative terminal (21) and a common ground return 23.
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