Design and cold-test of sheet beam coupled cavity slow wave structure for W-Band TWT
Received:August 03, 2019  Revised:April 01, 2020  download
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Author NameAffiliationE-mail
LU Zhi-Gang National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China lzhgchnn@uestc.edu.cn 
GE Wei-Hua National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 625653260@qq.com 
WEN Rui-Dong National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 1170504607@qq.com 
SU Zhi-Cheng National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 435173203@qq.com 
ZHU Mei-Ling National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 2549591547@qq.com 
DING Ke-Sen National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China 602936523@qq.com 
WANG Zhan-Liang National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China wangzl@uestc.edu.cn 
TANG Tao National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China esamuel@uestc.edu.cn 
Abstract:This paper presents the fabrication and cold-test of a three-slot-staggered-ladder coupled cavity slow wave structure (CC-SWS) along with high power input-output couplers and RF windows in W-band. The SWS is fed by a rectangular waveguide coupler which is made up of a three-order step-transform rectangular waveguide placed on the short edge of the input cavity. Firstly, the dispersion, interaction impedance, transmission property and beam-wave interaction are studied using the simulation method. It is shown that the traveling wave tube (TWT) with a three-slot-staggered-ladder CC-SWS is able to provide a sat-uration output power of more than 1000 W in the frequency range of 91-96GHz, and the maximum saturated output power can reach 1125W at 94 GHz. Secondly, the CC-SWS is fabricated by the high-precision CNC milling and fixed in a nonmagnetic stainless steel housing. Test results of the fab-ricated CC-SWS with couplers and RF-windows are presented, showing the S11 < -10 dB in the frequency range of 90GHz to 100GHz. Therefore, the three-slot-staggered-ladder CC-SWS is a promising slow wave circuit of high power W-band TWT.
keywords:traveling wave tube  W-band  three-slot-staggered-ladder  coupled cavity slow wave structure (CC-SWS)  cold test
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Copyright:《Journal of Infrared And Millimeter Waves》