S Band Miniaturized Reversed Cherenkov Oscillator with Uniform Magnetic Focusing System

Based on the reversed Cherenkov radiation of metamaterials (MTMs), an S band reversed Cherenkov oscillator (RCO) is designed. In order to make it practical, a coaxial coupling output structure and uniform magnetic focusing system are used. The simulation results using the particle-in-cell solver in CST 2017 Particle Studio show that the average output power of 55 kW at 2.219 GHz with 27.8% electronic efficiency is generated under the conditions of the beam voltage of 29 kV, the beam current of 6.8 A and the uniform axial magnetic field of 1300 G. The diameter of the metamaterial slow-wave structure (MSWS) is ~1/6-1/2 of its conventional counterparts of the backward wave oscillators (BWOs). The RCO can be applied to communication, radar, microwave heating, and so on.