Electronic switching devices
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Jul 10, 1991
filing date -
Jul 13, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high-speed field emission vacuum switching device comprises a cathode tip formed on a substrate, an extraction grid close to the cathode tip, and a modulator grid spaced from the cathode tip by a dielectric layer. The grids have apertures aligned with the cathode tip. An anode is spaced from the modulator grid by a dielectric layer. By use of the modulator grid, a substantial improvement in high-frequency switching performance can be achieved. A collector grid may be provided between the extraction grid and the modulator grid, and a cut-off grid may be disposed between the modulator and collector grids.
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