【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TE₁₀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TE₁₀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TE₁₀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TE₁₀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。更多还原

【Abstract】 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 TE₁₀ 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 TE₁₀ 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 TE₁₀ 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.更多还原