用于速调管功率合成输出结构的转向波导设计

Design of waveguide twist for klystron power combining output structure

为X波段高峰值功率速调管功率合成输出结构设计了一个工作在9 GHz的转向波导,用于连接功率合成器和速调管输出腔。转向波导结构由中心矩形谐振腔、两个矩形耦合孔和两边的输入输出波导组成;输入和输出波导由速调管输出腔和功率合成器确定,分别工作在TE10和TE01模式,它们相互垂直并偏离矩形谐振腔的中心;中间的矩形谐振腔工作在TM110,TE101和TE011混合模式。这种转向波导结构的3个反射零点构成了较宽的传输通带。将连接转向波导结构的功率合成器加载到速调管输出腔,计算了功率合成器加载后速调管输出腔的间隙阻抗。计算结果表明:功率合成器的加载对输出腔间隙阻抗影响不大。设计的转向波导结构很好地应用到了速调管功率合成输出结构中。

A waveguide twist for 9 GHz klystron power combining output structure has been designed in the paper, which is used to connect klystron power combiner and output cavity. The waveguide twist is composed of a rectangular resonator, two rectangular coupling slots and two waveguides. The two waveguides which serve as input and output work in rectangular TE10 and TE01 modes respectively and they offset from the center while perpendicular to each other. The rectangular resonator in the center works in the combined modes of TM110, TE101 and TE011. Optimization result shows that this waveguide twist has three reflection zeros forming a large passband. Finally, a klystron output cavity was loaded by a power combiner with the designed waveguide twist. The calculation result of its gap impedance shows that the designed waveguide twist can be well applied to klystron power combining output structure.