Ka频段带状注行波管的宽带扼流降压输出段设计OA
Design and simulation of a Ka-band broadband choke output section with voltage drop in a sheet-beam TWT
为了满足带状注真空电子器件需要宽带的运行要求,设计和分析了一款应用于 Ka波段带状注行波管的具有气隙非接触式的带有双层扼流槽的宽带扼流降压输出段结构,以传统矩形波导的设计理论为基础,通过优化输出段结构和添加匹配阶梯波导等手段,并利用 HFSS仿真软件对输出段进行建模和仿真分析.研究表明,采用扼流槽不仅可以实现有效抑制泄漏,还可以实现极宽的工作带宽.HFSS仿真软件分析结果表明:在反射系数为-20 dB以下的绝对带宽为 12 GHz,在毫米波频段下,波导互连处存在泄漏很常见,设计的扼流槽仿真结果下传输效率能达到 93.3%,相对带宽为 36.9%,达到了宽带的要求.仿真结果和实物冷测实验结果表明,该输出段结构具有工作带宽大,传输效率高,反射较低,能够提供降压功能的特点,且具有一定的抗干扰性和可靠性.
[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.
亢程;蒲友雷;吴泽威;韦柳;杨婧;罗勇
电子科技大学 电子科学与工程学院,成都 611731电子科技大学 电子科学与工程学院,成都 611731||电磁空间认知与智能控制技术实验室,北京 100089电子科技大学 电子科学与工程学院,成都 611731||电磁空间认知与智能控制技术实验室,北京 100089电子科技大学 电子科学与工程学院,成都 611731电子科技大学 电子科学与工程学院,成都 611731||电磁空间认知与智能控制技术实验室,北京 100089||天府绛溪实验室,成都 641419电子科技大学 电子科学与工程学院,成都 611731||电磁空间认知与智能控制技术实验室,北京 100089||天府绛溪实验室,成都 641419
信息技术与安全科学
带状注行波管宽带降压输出段扼流槽Ka波段高功率微波
sheet-beam TWTbroadband output section with voltage depression capabilitychoke structureKa-bandhigh-power microwave
《强激光与粒子束》 2026 (10)
14-19,6
国家重点研发计划项目(2023YFB2604100、2023YFB2604101)
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