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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。
Based on the three-stage cascade mode, the high-frequency characteristics of the slow wave structure of terahertz wave band photonic crystal zigzag waveguide are made by using the cut-off mode in the drift section and the photon crystal loading mode in the pre-cluster section and the radiation section Simulation calculation. The calculated results show that at f = 225 GHz, the slow wave structure of the photonic crystal loaded zigzag waveguide has a relatively smooth dispersion relation with a coupling impedance of 3.7Ω. When the operating voltage is 13 kV, the current is 56 mA and the electron injection radius is 0.09 mm , The slow-wave structure has a gain of 30.4 d B at f = 225 GHz at an input power of 5 mW. Compared with the conventional tortuous waveguide slow-wave structure under the same conditions, the band broadens significantly and the output power increases by 1.4 Times