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

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.

KEYWORDS:

• W-band
• double staggered grating
• traveling wave tube
• low gain
• cold test

ORCID

Ruidong Wen http://orcid.org/0000-0002-2529-6181

Additional information

Funding

This work is supported by the National Key Laboratory Foundation of China [grant number 614280701020117] and the China Postdoctoral Science Foundation [grant number 2017M62299].

Notes on contributors

Zhigang Lu

Zhigang Lu received the Ph.D. degree in Physical Electronics from National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, China. He is currently an associate professors at UESTC.

Ruidong Wen

Ruidong Wen is a graduate students at UESTC.

Weihua Ge

Weihua Ge is a graduate students at UESTC.

Zhicheng Su

Zhicheng Su is a graduate students at UESTC.

Kesen Ding

Kesen Ding is a graduate students at UESTC.

Meiling Zhu

Meiling Zhu is a graduate students at UESTC.

Zhanliang Wang

Zhanliang Wang received the PhD degree in Physical Electronics from National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, China. He is currently an associate professors at UESTC.

Tao Tang

Tao Tang received the M.A. degree in Physical Electronics from National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, China. He is currently a Senior Engineer at UESTC.