Backward-wave Oscillator (BWO) is one of the highest power microwave devices, is also the highest power and the highest efficiency millimeter wave microwave devices based on superradiance mechanism.

• 返波管是输出功率最高的微波器件之一,也是基于超辐射机理的毫米波微波器件中功率和功率转换效率最高的器件。