A5004740830- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Terahertz technology and applications
- Pulsed Power Technology Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Radio Frequency Integrated Circuit Design
- Electromagnetic Simulation and Numerical Methods
- Antenna Design and Analysis
- ZnO doping and properties
- Microbial Inactivation Methods
- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Acoustic Wave Resonator Technologies
- GaN-based semiconductor devices and materials
- Superconducting and THz Device Technology
- Insects and Parasite Interactions
- Photonic and Optical Devices
- Physics of Superconductivity and Magnetism
- Photonic Crystals and Applications
- Video Coding and Compression Technologies
- Power Systems and Technologies
- Gas Sensing Nanomaterials and Sensors
- Millimeter-Wave Propagation and Modeling
- Optical Coatings and Gratings
University of Electronic Science and Technology of China
2016-2025
Newcastle University
2024
Hefei Institutes of Physical Science
2024
Chinese Academy of Sciences
2024
China Academy of Space Technology
2023
Nanjing University of Aeronautics and Astronautics
2020-2022
Nanjing Agricultural University
2019
Guilin University of Electronic Technology
2018
Southwest Jiaotong University
2011-2015
Southwest Petroleum University
2015
Surface coating of composite electrode has recently received increasing attention and been demonstrated to be effective in enhancing the electrochemical performance lithium ion battery (LIB) materials. In this work, an electronic-insulating but ionic-conductive carbonate (Li2CO3) is rationally selected as unique material for commercial LiCoO2 (LCO) cathode. Li2CO3 a well-known constitute conventional solid electrolyte interface (SEI) layer, which can electrochemically protect electrode. The...
A novel backward wave oscillator was proposed by utilizing a concise sine waveguide slow-wave structure combined with sheet electron beam to operate at terahertz frequency band. First, the design method described, and dispersion curve interaction impedance of were calculated, then device oscillation operating voltage determined. Next, circuit transmission losses learned over tunable range. Finally, particle-in-cell simulation applied predict its signal generation performance. The...
The sine waveguide (SWG) is presented as a potential slow-wave structure (SWS) for the millimeter-wave (mm-wave) and terahertz (THz) traveling-wave tube (TWT) because of advantages wide bandwidth, natural electron beam tunnel, easy fabrication. In particular, this theoretical study indicates that transmission loss SWG far less than folded SWS, which widely employed in mm-wave THz TWT. Here, flat-roofed circuit working <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The sheet beam vacuum electron device is an attractive choice for generating high-power high-frequency microwave radiation. A millimeter-wave backward wave oscillator (BWO) presented in this paper. rectangular waveguide grating structure used as its slow structure. BWO driven by a with cross-sectional area of 30 mm × 1 which generated thin cathode. For voltage 167 kV and current 1.4 kA, the output power 40 MW at 36.6 GHz. beam-wave interaction efficiency about 17%, higher than that...
This article reports a slow-wave structure (SWS) working at 1 THz which can be fabricated through nano-computer numerical control (nano-CNC) technology for the first time. First, deformed quasi sine waveguide (D-QSWG) SWS has been designed and simulated in this article. To reduce metal loss of input output waveguide, coupler transit to over mode rectangular designed. The simulation result shows that waveguides with have lower than WR1 waveguide. fabricate D-QSWG SWS, tungsten steel endmills...
A Ka-band traveling-wave tube (TWT) was fabricated with a folded waveguide (FWG) as its slow-wave structure. The TWT demonstrates more than 700-W radio-frequency peak output power within 2.5-GHz bandwidth. Because this type of can be manufactured and assembled in an easy cheap way, the FWG will competing high-power millimeter wave source, compared to helix coupled-cavity TWTs Ka-band.
A novel slow-wave structure called ridge-vane-loaded folded waveguide combined with pencil electron beam has been proposed for millimeter-wave traveling-wave tubes. The high-frequency characteristics including the dispersion properties and interaction impedance of this kind have analyzed by means an equivalent circuit based on transmission-line cascading network. theoretical results agree well those obtained 3-D electromagnetic simulation software. nonlinear between field is investigated...
A novel slow-wave structure (SWS), named ridge-loaded sine waveguide (RLSWG), has been proposed to develop the wideband high-power terahertz traveling-wave tube (TWT). The characteristics of RLSWG SWS, including dispersion properties and interaction impedance, are analyzed by using 3-D electromagnetic simulation software Ansoft high frequency simulator (HFSS). From our calculation, average impedance SWS at 0.22 THz is 42.2% higher than conventional SWG SWS. Meanwhile, results demonstrate...
In this article, a 1-THz traveling-wave tube (TWT) based on flat-roofed sine waveguide (SWG) slow wave structure (SWS) has been studied theoretically and experimentally, parts of the component have fabricated. First, SWG SWS optimized for working at 1 THz, normalized phase velocity is around 0.287, interaction impedance over 3.5 Ω in frequency range 1.02-1.04 THz. Meanwhile, performance designed TWT simulated, whose saturated output power 720 mW corresponding gain 28.57 dB. What more, to...
The electron optical systems (EOS) play a vital role in vacuum devices (VED). This letter reported the design and experiments of sheet EOS for 1.03 THz traveling wave tube (TWT). A high-current-density beam (SEB) gun generating up to 20.3-mA at 22.4-kV is designed, based on requirements this TWT. Due very high operating frequency, more than 1 THz, miniature tunnel waist with dimension 0.05 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this letter, we present a novel non-quasi-2D slow-wave structure (NQSWS) for THz sheet beam traveling-wave tubes (THz SB TWTs), which have been conceived, fabricated and tested. Our proposed differs from the conventional quasi-2D structure, in featured cosine fluctuation horizontal direction on metallic roof proximity of tunnel. This modification results lower cutoff frequency, flatter dispersion property, higher average interaction impedance. Comparing with its counterpart same tunnel...
To achieve tens of kilowatt (kW) output power, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${W}$ </tex-math></inline-formula> -band klystron usually employs a large beam tunnel to accommodate high current. The deteriorated effective impedance the cavity could be reenhanced by adopting extended interaction (EI) cavities. In this article, new approach utilizing simple fundamental modes in cascaded...
The design and analysis of a high-power wideband sheetbeam coupled-cavity traveling-wave tube operating at V-band is presented.The interaction circuit employs three-slot doubly periodic staggered-ladder slow-wave structure, 5 : 1 aspectratio sheet electron beam used to interact with the circuit.Combined well-matched input output couplers, 3-D particle-in-cell model sheet-beam constructed.The electromagnetic characteristics beamwave are investigated.From our calculations, this can produce...
A novel slow-wave structure (SWS) called the folded rectangular groove guide, its electromagnetic characteristics, and beam-wave interaction are presented. This structure, evolved from a conventional guide by bending along longitudinal direction, can operate with sheet electron beam or circular beam. From our calculations, this SWS possesses larger impedance lower ohmic loss than those of waveguide same size. circuit produce output power over 260 W in 3-dB bandwidth range 88.5.5-98.5 GHz...
We propose a new type of terahertz (THz) radiation source based on the electron beam-wave interaction. A high-order harmonic-generation process was introduced to traveling-wave tube (TWT)-like device-the high-harmonic TWT or HHTWT. The scheme is configured as frequency multiplier and amplifier with W-band (millimeter wave) input signals THz output power. Simulations show that operation at seventh harmonic possible other order waves were suppressed. can be tuned continuously over 30-GHz...
A W-band sheet electron beam (SEB) traveling-wave tube (TWT) based on flat-roofed sine waveguide slow-wave structure (FRSWG-SWS) is proposed. The wave of the metal grating replaced by a around tunnel. characteristics including dispersion properties and interaction impedance have been investigated using eigenmode solver in 3-D electromagnetic simulation software Ansoft HFSS. Through calculations, FRSWG SWS possesses larger average than conventional (SWG) frequency range 86-110 GHz. beam-wave...
In this letter, the modified flat-roofed sine waveguide slow-wave structure (FRSWG-SWS) is proposed for wideband high-power sub-terahertz traveling-wave tube (sub-THz TWT), which possesses advantages of wide operating bandwidth, low loss, minimal reflection, and ease fabrication. The simulation results demonstrate that transmission parameter more than −5.0 dB in frequency range between 210 250 GHz. beam–wave interaction indicate FRSWG can provide over 50 W output power 30 gain from 205 to...
An extended interaction klystron (EIK) working at the frequency of 340 GHz is designed in this present article. The characteristic impedance, coupling coefficient, and normalized electron conductance cold cavities are analyzed optimized. To improve output power, EIK adopts a prebunching (PB)-cavity high-frequency structure (HFS). Compared with conventional terahertz (THz) EIK, coherence PB-cavity enhanced, power improved. 3-D particle-in-cell (PIC) simulation predicts driven by 0.20-A,...
A new type of folded frame slow-wave structure (SWS) is introduced and used in the design a low-voltage, high-efficiency, widebandwidth millimeter-wave traveling-wave tube (TWT). The high-frequency characteristics structure, including dispersion properties, coupling impedances, reflection are investigated. beam-wave interaction TWT with SWS working at frequency range also calculated using 3-D particle-in-cell algorithms. simulation results reveal that sheet electron beam parameters 6000 V...
A novel backward wave oscillator (BWO) is presented by utilizing a slotted sine waveguide with pencil electron beam to produce the high power terahertz wave. The frequency characteristics including dispersion properties, interaction impedances, and transmission of are analyzed in detail. system output coupler, slow structure (SWS), reflector designed properly. 3-D particle-in-cell mode applied predict device performance BWO based on SWS. investigation results demonstrate that this can...