Broad band low loss input coupling system in W-band gyrotron
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摘要: 给出了一种十字交叉型TE□10-TE○01宽带模式转换器的设计原理，同时完成了一套W波段低损耗输入耦合系统的设计方案。根据该设计方案在电磁模拟软件HFSS中建立三维模型进行优化仿真。得到了衰减为0.14 dB、最大驻波比为1.388、带宽为10 GHz的高性能TE□10-TE○01宽带模式转换器。同时计算得到整套传输系统的衰减小于1 dB，远小于采用矩形波导TE10模式的衰减（约15 dB），大大提高了传输效率，降低了能量损耗。实际加工得到了一对模式转换器，经测试可得其衰减为1 dB左右，整套系统的衰减约为3 dB，与矩形波导（衰减约为15 dB）相比，有了很大的提高。Abstract: The design principle of a TE□10-TE○01 broad band cruciform mode converter was addressed in this paper, and the scheme of a set of W-band low loss input coupling system was presented. According to this scheme, the 3-D model was optimized and simulated by HFSS. A TE□10-TE○01 broad bandmode converter with a loss of less than 0.14 dB, a maximum VSWR of 1.388, and a band width of 10 GHz was obtained through simulation. For the whole system, a calculated loss of less than 1 dB, which was far less than that of TE10 mode in the rectangle waveguide(about 15 dB), was given. It leaded to the increase of the transmission efficiency and reduction of the energy loss. A pair of manufactured mode converters was tested in the experiment, and the loss was about 1 dB. So the loss of the whole system was equal to 3 dB, which was greatly improved compared with the loss in the rectangle waveguide.
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Key words:
- gyro-traveling wave tube /
- low loss input coupling system /
- mode converter
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