具有同轴结构的高功率微波弯曲波导设计

摘要

基于模式耦合理论,在理论推导出弯曲同轴波导TEM模和同轴TE11模之间耦合系数显式表达的基础上,报道了可传输同轴TE11模的弯曲同轴波导的设计方法和计算结果,并进行了实例研究.数值仿真结果表明:设计的具有同轴结构的弯曲波导,利用不同的同轴空间,在P,L,S波段中心频率0.680,1.575和3.75 GHz处TE11模单模传输效率超过了99.5％,单模传输效率超过90％的工作带宽分别为0.60～0.83,1.10～2.42和3.10～4.16 GHz.该结构的功率容量在各频段均达到了GW量级.%Based on mode coupling theory, coupling coefficients of TEM coaxial waveguide mode to Ten mode have been derived theoretically, and the design of coaxial waveguide bend for transmitting Ten mode is reported. The computer simulation via commercial software, based on finite-element method, shows that the TEU mode transmission efficiency of the optimized coaxial waveguide bends have reached 99. 5% at 0. 680, 1. 575 and 3. 750 GHz. Moreover, the bandwidths in which the transmission efficiency exceeds 90% are 0. 60 to 0. 83 GHz, 1. 10 to 2. 42 GHz and 3. 10 to 4. 16 GHz, respectively. The power handling capacity has reached GW level.