The Electron Wave Tube, a Novel Method of Amplification and Generation of Microwave Energy

摘要

A novel method of generation and amplification of microwave energy is described. The method is based on space-charge inter action of electron streams of different velocities. The electron streams are generated with¬in a common space which, in the presence of electrons, behaves as a uni¬directional transmission medium having negative attenuation. The basic theory of the new method is developed and formulae and curves are given for propagation constant, electronic gain, and bandwidth which can be achieved with the device based on the new method. This device is called the "Electron Wave Tube."nThe design and performance of the "two-beam" type and the "single-beam* type experimental electron wave tubes are described. Electronic gains of the order of 80 decibels at a frequency of 2000 megacycles and electronic bandwidths of over 30 percent have been observed in experi¬mental electron wave tubes. It is pointed out that since no passive circuit is required in the amplifying region of the electron wave tube, the new method is important in the development of tubes for millimeter waves.