Development of counter-streaming multi-beam oscillator based on cold cathode

We propose a novel oscillator, so called "Counter-Streaming Multi-Beam Oscillator (CSMBO)," using the interaction between two electron beams reversely traveling for high frequency application, particularly millimeter/sub-millimeter region. The basic idea of the device is that the electron beams traveling in the opposite direction can mutually interact with one another through coupled-cavity. The coupled-cavities in the oscillator are playing a role in not only giving rise to inherent feedback network but also combining the output power generated from the electron beams. Based on the new feedback mechanism, modified counter-streaming beam oscillators using multi-cavity or multi-beam to minimize the start-oscillation current and to enlarge the electronic efficiency are also challenged for terahertz application.