0.14 THz折叠波导行波管慢波结构设计与加工

使用一种显式方法对0.14 THz折叠波导行波管慢波结构进行了快速设计,并通过解析模型、等效电路模型以及电磁场仿真软件(CST MWS)对结构的色散关系和耦合阻抗进行了计算。计算结果表明,0.14 THz附近的色散较为平坦,耦合阻抗在1Ω左右。为了满足大功率输出需求,对初始结构尺寸进行了部分调整。CST PS互作用模拟结果表明,在0.14 THz附近,输出功率大于1 W。用微电火花(EDM)和微铣削方法分别进行了加工实验,结果表明,两种方法在尺寸精确度上均能满足指标要求,微铣削加工能获得更平整、表面粗糙度更好的槽底。

Design and manufacture of 0.14 THz folded waveguide traveling wave tube slow wave structure

This study applied an explicit method to the fast structural design of the slow wave circuit in a 0.14 THz folded waveguide traveling wave tube.To valid the primary design,cold-circuit properties,such as dispersion and interaction impedance,were calculated by using both theoretical method and electromagnetic software（CST MWS） simulation.Simulation results showed that,the dispersion curve was almost flat around 0.14 THz,and the interaction impedance was about 1 Ω.In order to satisfy high output power demand,some changes were made.Interactive simulation by CST Particle Studio was found that modified structure could achieve more than 1 W output power around 0.14 THz.Micro Electrical Discharge Machining（EDM） and Micro milling were used for manufacturing a couple of period of the structure,respectively.It is found that both methods could satisfy the size accuracy,however,micro milling could obtain flatter surface and better surface roughness at the bottom.