Novel magnetically insulated transmission line oscillator with 2D periodic slow wave structure is put forward, the symmetrical mode and dissymmetrical mode of which have the same working frequency. It can get microwave with pure frequency during mode competition. At the same time the efficiency is increased. 3D electromagnetic software indicate that the symmetrical mode and dissymmetrical mode of slow microwave structure of the new magnetically insulated transmission line oscillator(MILO)have the same π mode resonance frequency while PIC simulation indicate that high-power microwave with muti-mode and pure frequency of 1.22 GHz is generated and the average output power is increased to 2. 8 GW from 2. 4 GW compared with the original MILO when the beam voltage is 450 kV and current is 43 kA.%为解决实验中经常遇到的输出微波频率不纯问题,提出一种新型磁绝缘线振荡器,采用2维周期慢波结构,使对称模式和低阶非对称模的工作频率相同,在模式竞争条件下得到纯频微波输出.利用3维电磁场软件计算表明,新型磁绝缘线振荡器的慢波结构的对称模式和低阶非对称模的π模谐振频率相同;3维粒子模拟计算表明,在450 kV,40 kA输入条件下,微波输出平均功率由2.4 GW提升至2.8 GW,输出模式为多种模式混合,频率为单一的1.22 GHz.
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