Design and Millimeter-Wave Measurement of a Wideband Power Coupling Structure for Sheet Electron Beam Devices

Shu, Guoxiang; Xiong, Hao; Cao, Lihong; Luo, Hexi; Liu, Guo; Wang, Jianxun; Qian, Zhengfang; He, Wenlong

doi:10.1109/ted.2019.2916827

Cited by 18 publications

(1 citation statement)

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“…Among these planar SWSs, the DSGW SWS has exhibited an intrinsically wide bandwidth and high power capacity. Likewise, different kinds of input/output couplers for SB-TWTs have been widely investigated, including an L-shaped power coupling structure with an oversized waveguide [16], a ridge loaded L-shaped waveguide with a cutoff waveguide [17], a L-shaped coupler with multistage matching steps and Bragg reflectors [18], a Y-shaped coupler and its improved versions [19]- [20], and a single branch waveguide coupler [21]. In this work, an H-band high frequency system (HFS) consisted of a DSGW SWS circuit and two L-shaped couplers with multistage matching steps and Bragg reflectors is studied.…”

Section: Introductionmentioning

confidence: 99%

Design, Fabrication, and Cold Test of a High Frequency System for an H-Band Sheet Beam Travelling Wave Tube

Shu

Deng

Xie

et al. 2020

IEEE Trans. THz Sci. Technol.

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Shenzhen University (2018046).Abstract-The design, fabrication and cold test of a high frequency system (HFS) for an H-band (220-325GHz) sheet beam travelling wave tube (SB-TWT) is presented in this paper. The HFS was composed of a 90-period double-staggered grating waveguide and a pair of identical L-shaped couplers with Bragg reflectors and matching steps. The HFS was manufactured by Nano-CNC machining and its electromagnetic properties were measured by using a vector network analyzer. The measured S-parameters were in good agreement with the simulated ones, which predicted a 3 dB bandwidth of ~47.0 GHz. The maximum value of the measured transmission coefficient S21 was -4.9 dB and the in-band port reflection S11 was around -15.0 dB. Based on the cold testing-based HFS, simulations of the beam wave interaction predicted a stable output power of over 55.1 W in the frequency range of 230-280 GHz. In addition, the instabilities of the beam wave interaction were investigated in the simulation.Index Terms-high frequency system, interaction instability, terahertz wave amplification, sheet beam travelling wave tubes.

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