强激光与粒子束2026，Vol.38Issue(10)：14-19,6.DOI:10.11884/HPLPB202638.250473
Ka频段带状注行波管的宽带扼流降压输出段设计
Design and simulation of a Ka-band broadband choke output section with voltage drop in a sheet-beam TWT
摘要
Abstract
[Background]Advanced sheet electron beam vacuum electron devices,particularly Ka-band traveling-wave tubes,are required to meet increasingly stringent broadband operational demands.However,energy leakage and impedance mismatch at millimeter-wave output interconnections remain major challenges that limit transmission efficiency and bandwidth performance.[Purpose]To address these challenges,this work aims to design and validate a broadband,high-efficiency output circuit for a Ka-band sheet beam TWT.A novel non-contact double-layer choke-mode output circuit with an air-gap configuration is proposed to suppress leakage and enable broadband operation.[Methods]The design is based on the fundamental theory of conventional rectangular waveguides.The output circuit structure is carefully optimized,and matching stepped waveguides are introduced to improve impedance matching and reduce reflections.A comprehensive electromagnetic simulation model is developed and analyzed using High-Frequency Structure Simulator(HFSS).Furthermore,cold-test measurements are conducted on a fabricated prototype to experimentally verify the design.[Results]HFSS simulation results show that the choke grooves effectively suppress parasitic leakage while enabling broadband transmission.The proposed output circuit achieves an absolute bandwidth of 12 GHz with a return loss better than-20 dB.The simulated transmission efficiency reaches 93.3%,corresponding to a relative bandwidth of 36.9%,which satisfies broadband operation requirements.Experimental cold-test results are in good agreement with the simulations,confirming the validity of the design.[Conclusions]Both simulation and experimental results demonstrate that the proposed choke-mode output circuit exhibits wide operating bandwidth,high transmission efficiency,low reflection,and effective voltage depression capability.The structure also shows strong anti-interference performance and operational reliability,making it well suited for high-power,broadband millimeter-wave sheet beam TWT applications.关键词
带状注行波管/宽带降压输出段/扼流槽/Ka波段/高功率微波Key words
sheet-beam TWT/broadband output section with voltage depression capability/choke structure/Ka-band/high-power microwave分类
信息技术与安全科学引用本文复制引用
亢程,蒲友雷,吴泽威,韦柳,杨婧,罗勇..Ka频段带状注行波管的宽带扼流降压输出段设计[J].强激光与粒子束,2026,38(10):14-19,6.基金项目
国家重点研发计划项目(2023YFB2604100、2023YFB2604101) （2023YFB2604100、2023YFB2604101）
