一种新型同轴TEM-圆波导TE11模式变换器
A new type of coaxial TEM-circular waveguide TE11 mode converter
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摘要: 提出了一种新型同轴插板式模式变换器，可以实现同轴TEM到圆波导TE11模式的变换。介绍了这种模式变换器的工作原理：即通过在同轴波导中沿轴向插入金属板，将同轴TEM模变换成扇形截面波导TE11模，进而利用不同扇形截面波导中的相移改变电场分布的轴对称性，在同轴波导中形成同轴TE11模，最后将同轴TE11模转换为圆波导TE11模式。基于这一原理设计了一个中心频率为3.8GHz的同轴TEM-圆波导TE11模式变换器，并进行了数值模拟。模拟结果表明：这种模式变换器可以承受高功率，中心频率上转换效率为98.5%，转换效率大于90%的带宽超过10%，在3.5~4.1GHz的频率范围内反射损耗低于0.3dB。Abstract: Many high-power microwave (HPM) sources utilize an azimuthally symmetric output mode, like the TM01 circular waveguide or the coaxial TEM modes. If radiated directly these modes produce a doughnut-shaped pattern, with a bore-sight null. A novel mode-conversion technique for transforming the azimuthally symmetric mode to one with a more desirable radiated pattern is described and analyzed. The novel approach is as follows: first, the coaxial TEM mode is converted to TE11 fan-shaped waveguide mode by inserting fins into the coaxial waveguide, then the coaxial TE11 mode is got by varying the length of the fins, finally the coaxial TE11 mode is transformed to TE11 circular waveguide mode. A mode converter for 3.8GHz based on this principle is designed and optimized. The calculated results show
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Key words:
- mode converter /
- high power microwave /
- coaxial waveguide /
- circular waveguide
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