摘要
基于三级级联模式,通过在漂移段采用切断方式、在预群聚段和辐射段采用光子晶体加载所需模式,利用CST对太赫兹波段光子晶体曲折波导慢波结构的高频特性作了模拟计算。计算结果表明:在f=225 GHz处,光子晶体加载曲折波导慢波结构有较平缓的色散关系,耦合阻抗为3.7Ω;当工作电压为13 kV、电流为56 mA、电子注半径为0.09 mm时,慢波结构在输入功率为5 mW情况下在f=225 GHz处具有30.4 d B的增益;与相同条件下的普通曲折波导慢波结构相比,频带显著变宽,输出功率增大1.4倍。
The folded-waveguide slow-wave structure shielded by photonic crystal（ Ph C-FW-SWS） comprised a cutting mode in the drift section and photonic crystal loading mode in the modulation and radiation sections,based on the three-stage cascade mode. The high frequency characteristicsin terahertz bandof Ph C-FW-SWS were mathematically modeled,theoretically analyzed and numerically simulated with software CST. The simulated results show that the Ph C-FW-SWS outperformed the conventional FW-SWS with a wider bandwidth and a much higher output power. To be specific,at 225 GHz,Ph C-FW-SWS had a fairly flat dispersion and a coupling impedance of 3. 7 Ω;operating at a voltage of 13 k V,a current of 56 m A,an input power of 5 m W,a frequency of 225 GHz,and with an electron beam radius of 0. 09 mm,Ph C-FW-SWS had a gain of 30. 4 d B,1. 4 times higher than that of the conventional FW-SWS under the same operating conditions.
出处
《真空科学与技术学报》
CSCD
北大核心
2017年第6期561-566,共6页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金青年基金资助项目(61401427)
