Cold cathode density-modulated type electron gun and microwave tube using the same
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United States of America Patent
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Oct 21, 1997
Grant Date -
N/A
app pub date -
Jun 8, 1994
filing date -
Jun 8, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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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