W波段回旋管宽带低损耗输入耦合系统

Broad band low loss input coupling system in W-band gyrotron

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0.14dB、最大驻波比为1.388、带宽为10GHz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1dB,远小于采用矩形波导TE10模式的衰减(约15dB),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1dB左右,整套系统的衰减约为3dB,与矩形波导(衰减约为15dB)相比,有了很大的提高。

The design principle of a TE- TE 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 - TE broad handmode 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 TEl0 mode in the rectangle waveguide（about 15 dB）, was given. It leaded to the increase of the transmis- sion 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.