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Vertical vacuum channel nanogaps were fabricated on a metal-oxide-metal-semiconductor substrate using standard silicon semiconductor processing. The field emission characteristics of the nanogaps were investigated and the emission failures in testing were analyzed. The goal of the research aims to low-power, low-cost, high-speed vacuum nanochannel transistor and vacuum integrated circuit.
According to the original design of 30W level W-band folded waveguide CW traveling wave tube (TWT), a step-tapering structure was at the end of the uniform interaction circuit to improve the electron efficiency. Compared two kinds of tapering circuit, the results indicate that both circuits could achieve over 40W power at 91GHz∼97GHz. The electron efficiency could be improved from 3% to 4%. A collector...
A study of efficiency of Ka-band TWTs with multistage depressed collectors (MDCs) ion-treated and untreated, respectively is reported. It was shown that efficiency of the TWT with ion-treated MDCs improved by as high as 7%, in comparison to that of one with untreated MDCs.
Summary form only given. In contrast with conventional thermoionic cathodes traveling wave tubes (TWT), the TWT employing field emitter array (FEA) cathodes are expected higher efficiency, with more compact size and lighter weight. When applying FEAs as the cathodes of the TWTs, many problems are to be considered and among them, the beam control and focusing of electron guns is the most principal...
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