Field-emission cold cathode for dual-mode operation useable in a microwave tube
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United States of America Patent
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Feb 18, 1997
Grant Date -
N/A
app pub date -
Dec 22, 1994
filing date -
Dec 22, 1993
priority date (Note) -
Expired
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Abstract
An electron beam having a high current ratio between the high and the low current modes, susceptible to no significant change in beam diameter and relatively free from ripples in both modes is formed. This electron beam is used to realize a highly reliable, simple-structured and compact microwave tube which performs nearly optimal RF operations in both modes. The gate electrode or the emitter electrode, in which emitters are formed, of a field-emission cold cathode is divided into a plurality of parts, and the area in which electrons are emitted is switched over by varying the voltage applied to this divided electrode to make possible switching between two current modes, the high and the low. Alternatively, the current ratio between the high and the low current modes is made settable by making variable the connections between three or more parts into which the gate electrode or the emitter electrode are divided.
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