| 摘要 |
Tips of emitters are protruded over a control electrode in a field emission cathode. The cathode is a part of an input cavity, and an anode facing the cathode is also a part of the input cavity. A voltage which is in the vicinity of a threshold value or less than the threshold value is applied across the control electrode and the emitters, so that an emission current is modulated in density by a RF input signal.
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