指出了磁绝缘线振荡器(MILO)微波提取结构传统设计方法中可能存在的问题。通过高频电磁软件模拟得到当微波提取结构具有不同特征阻抗时TEM模式功率传输效率在MILO工作频点附近的频率响应规律。模拟结果表明, 当MILO阻抗较高时, 用传统方式设计的微波提取结构不能满足TEM模式传输的要求。为了解决高阻抗情况下TEM模式的传输困难, 提出并讨论了阶梯负载的设计方案。进一步模拟结果表明, 阶梯负载克服了TEM模式的传输困难, 提高了微波提取结构对MILO频率漂移的适应能力。

The paper presents the potential problem in traditional microwave extractor design in the magnetically insulated line oscillator (MILO). Through high frequency electromagnetic simulation, the dependence of TEM mode transmission efficiency on frequency is obtained at different impedance of the microwave extractor. Simulation results show that the microwave extractor designed in traditional way can not meet the demand of TEM transmission. In order to conquer the transmission difficulty of TEM mode, the paper introduces the scheme using ladder load. Further simulation results indicate that the ladder load conquers the transmission difficulty of TEM mode and improves the adaptability of the microwave extractor to frequency drifting of the MILO.