Investigation on a Ka Band Diamond-Supported Meander-Line SWS
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Investigation on a Ka Band Diamond-Supported Meander-Line SWS Zhanliang Wang 1 & Liangxin Su 1 & Zhaoyun Duan 1 & Qiang Hu 2 & Huarong Gong 1 & Zhigang Lu 1 & Jinjun Feng 3 & Shifeng Li 4 & Yubin Gong 1 Received: 1 March 2020 / Accepted: 17 August 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
The microstrip meander-line traveling wave tube (TWT) is a kind of small sized, low voltage, low cost, and easy to fabricate TWT. It is an attractive choice for many applications, such as communication systems, phased array radars, security detectors, and electronic counter measure (ECM) instruments. In this paper, a Ka band U-shape meander-line slow wave structure (SWS) supported by a diamond rod is presented. The dispersion characteristics of this meander-line SWS are analyzed using CST MW Studio. The S-parameter simulation results show that the reflection is below − 15 dB between 32 and 38 GHz, and the particle-in-cell (PIC) simulation reveals that this meander-line TWT can produce 57 W output power at 36 GHz, when it is driven by a 8.1 kV, 0.04 A sheet beam with rectangular cross-sectional area of 1.0 mm × 0.12 mm. This meander-line SWS is manufactured, assembled, and tested. The good agreement between the simulated and measured S11 has been achieved and the mismatch between the simulated and measured S21 has been discussed at the end. Keywords Sheet electron beam . Traveling wave tube . Microstrip meander-line
* Zhanliang Wang [email protected]
1
School of Electronics Science and Engineering, University Electronic Science and Technology of China (UESTC), Chengdu 610054, China
2
Jihua laboratory, Foshan 528000, China
3
Beijing Vacuum Electronics Research Institute (BVERI), Beijing 100015, China
4
Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang 621900, China
Journal of Infrared, Millimeter, and Terahertz Waves
1 Introduction The microstrip TWT, combining the virtues of the microstrip circuits and the virtues of the vacuum amplifiers, is with small sized, light weight, broad band, high power, and low cost with mass production. Therefore, it is an attractive choice for many applications, such as individual communication systems, phased array radars, security detectors, ECM instruments, and medical/biomedical instruments [1–5]. Because of the above virtues and the broad applications, the microstrip TWT has been studied since 1970s. In 1972, A. W. Scott at Varian TWT Division reported a 20-W continuous wave (CW) L-bandprinted circuit TWT. All the TWT’s elements, including the electron beam forming electrodes, the microwave interaction structure, the collector, and the microwave connections, are printed on a pair of ceramic sheets. In the next year, associated with U.S. Army Electronics Command, a 2 KW S band multiple circuit TWT and a 100 W X band four meander-lines TWT were manufactured. The S band TWT produced 180 W average power at the efficiency of 8% and the gain of 20 dB. The X-band TWT produced 10 W average power at 9.5–10.5 GHz
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