Design of Ka-band high power TM0n-TEM hybrid modes convertor
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摘要: 由于过模Ka波段高功率微波返波管通常输出TTM0n混合模式，在保证较高能量转换效率的条件下，难以同时兼顾其输出模式的纯度，而辐射终端为达到理想发射效果则要求单一模式馈入，这就给输出混合模式微波源的实际应用带来困难。针对这一技术难点，提出了一种结构紧凑的TM0n-TEM(n5)混合模式转换器的设计方法，利用内外两路同轴阶梯波导并配合适当的插板调相结构可以实现在高功率容量条件下，较宽频带范围内，高效地将TM0n混合模式转换为单一的TEM模，降低了此类高频段HPM源模式纯化设计的难度。Abstract: Overmoded Ka-band high power microwave (HPM) sources with high energy efficiency can not ensure the output modes purity, which are generally mixedTM0n modes. However, it is necessary for high radiation efficiency that the microwave input to the ready-made radiation terminal is a certain single mode. So it is hard to put these HPM sources into application. In this paper, a hybrid modes converter, utilizing outer and inner coaxial waveguides to purify TM0n mixed modes with high power handing capacity, is proposed. With this method, the TM0n(n5) mixed modes can be converted into pure TEM mode with high conversion efficiency, reducing the modes purification difficulty in the design of the overmoded HPM sources.
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Key words:
- high power microwave /
- relativistic back wave oscillator /
- Ka-band /
- TM0n mixed modes /
- mode conversion
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