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Brief Communications
Nature 437, 968 (13 October 2005) | doi:10.1038/437968a; Published online 12 October 2005
Microwave devices: Carbon nanotubes as cold cathodes
Kenneth B. K. Teo1, Eric Minoux2, Ludovic Hudanski3, Franck Peauger3, Jean-Philippe Schnell2, Laurent Gangloff1, Pierre Legagneux2, Dominique Dieumegard3, Gehan A. J. Amaratunga1 & William I. Milne1
Abstract
To communicate, spacecraft and satellites rely on microwave devices, which at present are based on relatively inefficient thermionic electron sources that require heating and cannot be switched on instantaneously. Here we describe a microwave diode that uses a cold-cathode electron source consisting of carbon nanotubes1 and that operates at high frequency and at high current densities. Because it weighs little, responds instantaneously and has no need of heating, this miniaturized electron source should prove valuable for microwave devices used in telecommunications.
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