A5000814674- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Pulsed Power Technology Applications
- Particle accelerators and beam dynamics
- Terahertz technology and applications
- Photonic and Optical Devices
- Radio Frequency Integrated Circuit Design
- Electromagnetic Simulation and Numerical Methods
- Photonic Crystals and Applications
- Geotechnical Engineering and Underground Structures
- Optical Network Technologies
- Laser Design and Applications
- Fuel Cells and Related Materials
- Metamaterials and Metasurfaces Applications
- Wave and Wind Energy Systems
- Acoustic Wave Resonator Technologies
- Electrocatalysts for Energy Conversion
- Advanced Antenna and Metasurface Technologies
- Semiconductor Lasers and Optical Devices
- Particle Accelerators and Free-Electron Lasers
- RFID technology advancements
- Engineering Applied Research
- Advanced Memory and Neural Computing
- Insects and Parasite Interactions
- Advanced Optical Sensing Technologies
University of Electronic Science and Technology of China
2019-2025
To meet the need to transmit increasingly massive volumes of data, a more than 3 kW continuous wave (CW) Ka-band sheet beam traveling-wave tube (SB-TWT) is reported for first time. Working under unsaturated drive, maximum gain obtained 29 dB with 30.9 kV, 0.82 A, and efficiency exceeds 24% single-stage collector depressed -15 kV. The 1-dB bandwidth reaches 6 GHz from 26 32 output power greater 2 can even reach 7GHz 33 GHz. realization 99.8% static transmission as well over 97% actual CW...
In future electronic devices, the trade-off between power capacity and thermal management will be a severe challenge. this letter, sheet beam slow-wave structure (SB-SWS) has been proposed to realize high-power output while taking into account cooling design inside traveling-wave tubes (TWT). The of modified ensures sufficient axial electric field component efficient interaction, meanwhile expands width metal vanes by 327% micro-channel cooling. load for interception increased 25%. Utilizing...
Sheet beam vacuum electron tubes are an attractive solution for high-power sources or amplifiers at millimeter-wave and terahertz range. In this article, a high-order coalesced TM11-like mode operation 220 GHz sheet traveling-wave tube is proposed. The feasibility of investigated. utilization expands the RF circuit power capacity, increases current reduces cathode emission density. self-consistent nonlinear code three-dimensional particle-in-cell simulations used to verify 6.7% beam-wave...
This article proposes a longitudinal output structure in Ka-band sheet beam traveling-wave tube (SBTWT) with an ultrawideband transmission and high breakdown collector voltage. A novel electromagnetic bandgap (EBG) cutoff is designed to separate the slow-wave (SWS) depressed collector. The large stopband property of EBG applied achieve not only low gap leakage but also long distance provide voltage 3-D simulations single show full (26.5–40 GHz) reflection less than −20 dB −0.02 dB. entire...
This article explores an extremely high beam–wave interaction (BWI) efficiency technology of sheet beam traveling wave tubes (SBTWTs). An all-period phase velocity tapering optimization method is proposed to improve BWI slow structure (SWS). The effects the special electron bunching state and synchronous change on improvement generated by this are analyzed. To solve computational burden caused dozens parameters, self-developed 1-D nonlinear code used calculate BWI. For best effect, particle...
In response to the urgent requirement for a high-power millimeter-wave system with small size, low cost, and excellent maneuverability in W-band, compact high average power sheet beam extended interaction oscillator (SB-EIO) based on periodic cusp magnet (PCM) is designed, fabricated, hot tested reliability verified. The maximum output 10.2 kW at working duty of 1%. When increased 27%, an 2.2 achieved, corresponding <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The utilization of phase velocity tapering or jumping techniques in the design traveling wave tubes (TWTs) has become a widely accepted practice for enhancing efficiency beam–wave interaction. However, these approaches are not without their challenges, as they can lead to series self-excited oscillation (SEO) issues that restrict further improvement power. In this article, nonlinear numerical method is explored fast prediction SEO nonuniform periodic sheet beam TWTs (NP-SBTWTs). thresholds...
The improvement of the beam–wave interaction efficiency sheet beam extended oscillator (SBEIO) is studied and presented in this article. A novel multi-parameter optimization scheme developed, which based on simulated annealing global algorithm, nonlinear theory, 3-D simulations, including axial electric field distribution distances between each gap. particle-in-cell (PIC) simulations are performed to verify scheme. <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this article, a compact mode selection filter and converter for the 0.22-THz sheet beam traveling-wave tube (SB-TWT) has been proposed, fabricated, tested to realize selective absorption of high-order without interference on working mode. The reasonable structure placement is explored from theory manufacturing method in order minimize reflection distortion by junction discontinuity. Two proof-of-concept prototypes have fabricated analyze error sources terahertz device. And corresponding...
Considerable progress has been made in the development of sheet beam traveling-wave tubes (SB-TWTs) that operate millimeter-wave and terahertz domains. However, research pertaining to SB-TWTs operating super high frequency (SHF) band is notably lacking. In this article, potential for future advancement into SHF investigated. To address technical challenges sideband oscillation excessive size, an ultra-wideband flattened design proposed verified. The employs a flat electric field with 84.6%...
A novel optimization method is proposed for design of high compression ratio sheet beam electron gun. Since the traditional gun requires more manual debugging, this combining fuzzy control theory and genetic algorithm greatly reduces time cost to obtain global optimal solution. With method, a W-band with 10:1 optimized about 70% saved compared optimization.
A design method of the metamaterial-based output window is analyzed. By equivalent medium theory (EMT), dielectric constant can be changed by its proportion. Compared with traditional multi-layer window, flexibility this significantly improved. The simulated result has achieved a frequency bandwidth about 7.5 GHz for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$TE_{11}$</tex> mode circular waveguide in Ka-band. measurement shows −20 dB 7...
Circular polarizers have essential applications in modern radar and communication systems. However, an online tunable wideband dual-circular polarizer with a power capability of more than 150 kW the Ku band has not been reported yet, it recently become fundamental problem for developing some high-power This paper designed overmoded waveguide operating TE11 mode non-contact cutting-off choke to imply high capability. A high-precision stepping motor is used control rotation elliptical...
The emerging sheet beam devices have become a research hotspot in the field of vacuum electronics due to their excellent performance millimeter-wave and even terahertz bands, but there are still many technical bottlenecks actual manufacture engineering realization. In this article, an ultracompact high-isolation power coupler prototype is demonstrated for high-efficiency injection extraction electromagnetic energy from traveling wave tubes (SB-TWTs). introduction polarized rotators avoids...
The staggered double vane (SDV) sheet beam traveling-wave tube (TWT) is an important high power microwave source with a board application prospect such as detection, communication and diagnostics systems. It has large capacity compact structure which very appropriate for continuous wave (CW) airborne spaceborne applications. In this paper, the RF full Ku band SDV TWT been designed. bandwidth of enlarged phase velocity taper profile optimized heuristic algorithm to enhance beam-wave...
Oscillations are known to be one of the most critical problem in design high-power traveling-wave tubes (TWTs). In this paper, a novel waveguide-loaded scheme for high order mode oscillation suppression sheet beam tube is proposed. By selected loading transverse staggered waveguides on both sides interaction circuit, high-order significantly suppressed. The simulation demonstrates possibility TWT G band. This offers new approach solve problems TWTs.
The sheet beam traveling-wave tube (SBTWT) with staggered double vane (SDV) structure has attracted much attention as a board band and powerful terahertz millimeter-wave source. In this paper, the velocity taper for SDV is optimized recently proposed swarm-intelligence (SI) based optimization algorithm named dragonfly (DA) in order to enhance beam-wave interaction efficiency TWT. result of compared other commonly used algorithms. DA verified CST particle cell (PIC) simulations. been greatly...