Theoretical and experimental study of a 0.85-THz tunable folded waveguide regenerative-feedback vacuum-electronics oscillator
Received:October 22, 2019  Revised:March 24, 2020  download
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Author NameAffiliationE-mail
LI Tian-Yi National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China litianyi_ve@hotmail.com 
PAN Pan National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China  
MENG Wei-Si National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China  
LI Dong National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China  
CAI Jun National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China  
Wu Xian-Ping National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China  
FENG Jin-Jun National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China  
YAN Tie-Chang National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China  
Abstract:A tunable feedback oscillator for 850GHz terahertz wave imaging system is proposed. The use of a folded waveguide as the slow-wave structure permits the superior performance together with the capability of UV-LIGA process. The comparison of dispersion character of FWG designed and optimized using eigenmode solver in CST Microwave Studio, respectively applied in regenerative feedback oscillator and traveling wave tube shows the key factor of tunable frequency centered at 850GHz. Additionally, a feedback circuit including T-joint structure with lossy metal is simulated and the design, including SWS and feedback circuit, is verified by 3-D particle-in-cell simulations. On varying the beam voltage, the frequency-adjustable oscillation changes from a stale single-frequency state at the beginning to multi-frequency spectra, demonstrating more than 200mW output power.
keywords:regenerative feedback oscillator  terahertz  folded waveguide  PIC solver
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Copyright:《Journal of Infrared And Millimeter Waves》