Design of a low-gain high-power W-band sheet-beam traveling wave tube using a double-staggered grating slow wave structure. Issue 15 (13th October 2019)

• Record Type: Journal Article
• Authors: Lu, Zhigang; Wen, Ruidong; Ge, Weihua; Su, Zhicheng; Ding, Kesen; Zhu, Meiling; Wang, Zhanliang; Tang, Tao
• Is Part Of: Journal of electromagnetic waves and applications. Volume 33:Issue 15(2019)
• Page Start: 1996
• Page End: 2008
• Publication Date: 2019-10-13
• Subjects: W-band -- double staggered grating -- traveling wave tube -- low gain -- cold test; Electromagnetic waves -- Periodicals; Electromagnetic devices -- Periodicals; 621.3
• DOI: 10.1080/09205071.2019.1661798
• Languages: English
• ISSNs: 0920-5071

Abstract

Abstract : In order to further improve the output power of W -band traveling wave tube (TWT), a low gain TWT was proposed as a secondary amplifier. It uses a double staggered grating slow wave structure (DSG-SWS) and a sheet beam. Firstly, the design of DSG-TWT was given. Through simulation, the DSG-TWT could provide a saturation output power of more than 1000 W in the frequency range of 93–97 GHz, and the maximum output power could reach 1200 W at 95 GHz. No oscillation and current interception were found. Then DSG-SWS was fabricated by E -plane partition method using high-precision CNC milling. The SWS was fed with a high-power input-output coupler which consists of a mode converter and an impedance transformer. Simulation and cold-test results were presented, showing that the S 11 is less than −10 dB and the voltage standing wave ratio (VSWR) is less than 2.0 in the frequency range of 93–100 GHz.