Research On Energy Transmission Window Of Terahertz Wave

The application of terahertz technology,along with the rational utilization of electric vacuum devices such as traveling wave tubes,could potentially resolve the dearth of highpowered terahertz sources.Of particular note is the energy transmission window,which is a fundamental element of the electric vacuum device and is impervious to radio frequency signals,thus isolating the vacuum and atmosphere without impacting the signal transmission both inside and outside the tube.The construction and assembly of parts,along with the transmission performance of the energy transmission window,become more stringent when the operating frequency is raised to the terahertz band.Consequently,designing and executing a broad,low-loss terahertz energy transmission window is a critical area of research in the field of terahertz electric vacuum devices.This thesis endeavors to optimize the simulation design of beryllium oxide,sapphire and diamond energy transmission windows at two frequencies of 150 GHz,220GHz and150 GHz respectively.The HFSS simulation design software is employed to construct a physical model,with the theoretical size parameters simulated and optimized,and the resultant simulation results then obtained.The design of the reflection coefficient S11<-20 d B,the standing wave ratio VSWR<1.2 and the passband width of about 20 GHz at the operating frequency are realized.Referring to the optimized size of the simulation,through parts processing and assembly,the fabrication of the 150 GHz beryllium oxide half-wavelength window,the 220 GHz beryllium oxide full-wavelength window,and the150 GHz sapphire window was finally completed.The simulation results are in close agreement with the test outcomes.