用八孔耦合器识别TM0_(1)/TE_(11)混模中TE_(11)模式的方法  

Method for identifying TE11 mode in TM_(01)/TE_(11)mixed mode system with eight-hole coupler

作　　者：任杰 翁明[1] 雷乐[1] 林舒 曹猛[1] 翟永贵 Ren Jie;Weng Ming;Lei Le;Lin Shu;Cao Meng;Zhai Yonggui(Faculty of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电子与信息学部,西安710049

出　　处：《强激光与粒子束》2022年第9期1-8,共8页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61971342)。

摘　　要：在高功率微波传输系统中,为了提高功率容量和效率,往往采用过模波导,因此圆波导中往往出现TM_(01)和TE_(11)混合模式的情况。采用角向均匀分布的8孔圆波导耦合器,对提取TE_(11)模式的混合比和极化角度的方法进行了分析和研究。分析了圆波导中TM_(01)和TE_(11)模式在耦合孔处的电场分布,并采用CST对各耦合孔的输出功率进行了模拟计算,得出相互正对的耦合孔的平均功率与8个孔的平均功率之比与模式之间的相位差无关的结论。同时,发现该比值与TE_(11)模式的混合比成线性关系,线性关系中的比例系数是极化角度线性函数。通过线性拟合获得了计算TE_(11)模式混合比和极化方向的表达式。与仿真设定的参数相比,用该表达式计算的结果表明,在TE_(11)模式混合比小于30%时,用其计算TE_(11)模式的混合比和极化角度是可行的,误差不超过10%。在此基础上,给出了实际情况下TE_(11)模式信息的具体判断方法。In high power microwave transmission systems,over-mode waveguides are often used to improvepower capacity and efficiency,thus the mixed modes of TM_(01) and TE_(11) often appear in circular waveguides.In thispaper,the method of extracting the mixing ratio and polarization angle of the TE_(11) mode is analyzed and studied byusing an 8-hole circular waveguide coupler with uniform angular distribution.The electric field distribution of theTM_(01) and TE_(11) modes in the circular waveguide at the coupling hole is analyzed,and the output power of eachcoupling hole is simulated by CST.By obtaining the average power of the coupling holes facing each other and theaverage power of the eight holes,it is concluded that the ratio is independent of the phase difference between themodes.At the same time,it is found that the ratio is linearly related to the mixing ratio of the TE_(11) mode,and theproportionality coefficient in the linear relationship is a linear function of the polarization angle.Expressions forcalculating the TE_(11) mode mixing ratio and polarization direction are obtained by linear fitting.Compared with theparameters set by the simulation,the results calculated by this expression show that when the mixing ratio of TE_(11) mode is less than 30%,it is feasible to use it to calculate the mixing ratio and polarization angle of TE_(11) mode,and theerror does not exceed 10%.On this basis,this paper presents a specific method for judging TE_(11) mode information inpractical situations.

关 键 词：圆波导耦合器 高功率微波 模式混合比 极化角度 

分 类 号：TN622[电子电信—电路与系统]