Design of a low-gain high-power W-band sheet-beam traveling wave tube using a double-staggered grating slow wave structure

Zhigang Lu, Ruidong Wen, Weihua Ge, Zhicheng Su, Kesen Ding, Meiling Zhu, Zhanliang Wang and Tao Tang

Journal of Electromagnetic Waves and Applications, 2019, vol. 33, issue 15, 1996-2008

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 S11 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.

Date: 2019
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DOI: 10.1080/09205071.2019.1661798

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