A novel back-ward wave oscillator(BWO) with photonic band gap(PBG) structure is proposed. The PBG structure offers mode-confining and choosing mechanisms,restraining the lower modes and making the BWO operate at the higher modes.

• 提出了一种新型的具有光子晶体带隙(PBG)结构的返波振荡器(BWO),利用PBG禁带对BWO工作及输出微波模式进行调制,抑制低次模式,工作在高次模式。