毫米波径向器件的微波功分提取结构  

Power-Divider Microwave Extraction in Millimeter-Wave Radial Devices

作　　者：王海涛[1] 张军[1] 党方超 钱宝良[1] WANG Hai-tao;ZHANG Jun;DANG Fang-chao;QIAN Bao-liang(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,长沙410073

出　　处：《现代应用物理》2020年第3期50-55,共6页Modern Applied Physics

基　　金：国家自然科学基金资助项目(61771482)。

摘　　要：针对高功率毫米波径向器件因径向尺寸大、输出波长短造成的支撑杆数目多和结构复杂的问题,本文提出了一种Ka波段径向渡越时间振荡器的毫米波功分提取结构。该结构可以将同轴波导的TEM模完全转化为矩形波导的TE 10模,且结构中引入的同轴反射槽可以有效降低输出波导的个数。仿真结果表明,48路驻波式毫米波提取结构可以在特定频点实现TEM模到TE 10模的转化,且在大于320 MHz的频带范围内可实现转换效率大于99%。36路行波式毫米波提取结构也可以实现在特定频点处由TEM模式到TE 10模式的完全转化,但由于TE 72,1模式在同轴结构中未被截止,故行波式毫米波提取结构实现TEM模式到TE 10模式转化时,转换效率超过99%的频带宽度仅为160 MHz。对电场强度的测试结果表明,在相同的注入功率下,行波式功分提取结构内的最大电场强度明显小于驻波式功分提取结构中的最大电场强度,这2种功分提取结构均能满足吉瓦级毫米波输出的需求。To solve the problems of large number of support rods and complex structure in high power millimeter-wave radial devices due to large radial size and short output wavelength,a millimeter-wave power-divider microwave extraction of Ka band radial transit time oscillator is proposed to transform the microwaves with TEM mode in the coaxial waveguide into the microwaves with the TE 10 mode in the rectangular waveguide.Besides,the coaxial reflector is introduced to decrease the number of the output rectangular waveguides effectively.The simulation results show that the 48-channel standing-wave power-divider microwave extraction can transform microwaves with the TEM mode to microwaves with the TE 10 mode completely at some certain frequency points,and the conversion efficiency is more than 99%in the frequency band larger than 320 MHz.The 36-channel travelling-wave power-divider microwave extraction can realize the total transmission from TEM mode to TE 10 mode at a certain frequency point.However,the TE 72,1 mode will not be cutoff in the coaxial waveguide,therefore the frequency band will decrease to 160 MHz when the transmission efficiency is over 99%.The results show that the maximum electric field strength in the structure of traveling-wave-type power extraction is obviously smaller than that of standing-wave-type power extraction structure under the same injection power,and both of these structures can meet the demand of GW-class millimeter wave output.

关 键 词：高功率毫米波径向器件 同轴反射槽 驻波式 行波式 功分提取结构 

分 类 号：TN722[电子电信—电路与系统]