Demonstration of an Ultracompact, High-Isolation Power Coupler for <i>W</i>-Band Sheet Beam Traveling Wave Tubes

Wan, Yixin; Wang, Jianxun; Li, Xinjie; Dai, Zihao; Jiang, Wei; Zheng, Qiang; Luo, Yong

doi:10.1109/ted.2022.3227011

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…reported SnO 2 QDs‐based p‐i‐n photodiodes. [ 93 ] The modified solvothermal method was utilized to prepare the SnO 2 QDs, and as‐synthesized QDs achieved narrow size distribution of 2.5−5 nm and extended energy bandgap of the 4.69 eV through the quantum confinement effect. However, during the annealing process for the film fabrication, the organic ligands on QDs surface were degraded and it led to the size increase of QDs, resulting in a decrease in the energy bandgap to 4.38 eV.…”

Section: Quantum Dot‐based Duv Pdsmentioning

confidence: 99%

Unleashing the Power of Quantum Dots: Emerging Applications from Deep‐Ultraviolet Photodetectors for Brighter Futures

Park,

Lee,

Hur

et al. 2023

Advanced Optical Materials

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Since their discovery in 1981, quantum dots (QDs) have been the center of attention in optoelectronic fields owing to their excellent properties such as clearly discrete band structure, high luminous efficiency, and tunable energy bandgap via dot size control. Among them, the bandgap increase characteristic based on the quantum confinement effect opens a new horizon in the field of deep ultraviolet photodetectors (DUV PDs). Emerging applications such as risk monitoring, wireless optical communication, and chemical sensing with extremely low environmental interference raise the significance of DUV PDs. Nonetheless, the limited material selection for DUV absorption has been the main obstacle for further applications. Along this line, this review systematically revisits the recent advances in QD‐based DUV PDs, using bandgap‐widened QDs, with a focus on the synthetic method, device architecture, and interactions among constituent components. Various QDs categorized into carbon, oxide, sulfide, and nitride are reviewed with the specific characteristics of each substance. The future prospects of QD‐based DUV PDs in terms of practical applications and the current challenges are discussed.

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Section: Quantum Dot‐based Duv Pdsmentioning

confidence: 99%

Unleashing the Power of Quantum Dots: Emerging Applications from Deep‐Ultraviolet Photodetectors for Brighter Futures

Park,

Lee,

Hur

et al. 2023

Advanced Optical Materials

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“…In addition, there are some non‐mainstream couplers of SB‐TWT, such as multiaperture coupler [6], E‐plane bend coupler [7], Chebyshev‐curve profile directional coupler [8], and polarization rotation coupler [9]. They cannot meet the four requirements of PCM‐focused SB‐TWT couplers at the same time, so they cannot be applied in engineering.…”

Section: Introductionmentioning

confidence: 99%

Design of an ultrashort H‐plane coupler without transition structure for sheet beam traveling‐wave tube amplifier at W‐band

Guo,

Zhang,

Cai

et al. 2023

Electronics Letters

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An ultrashort H‐plane sheet beam traveling‐wave tube (SB‐TWT) coupler without transition structure is proposed. The coupler adopts a new idea of directly coupling the microwave from H‐plane of the slow‐wave circuit (SWC) and optimizes the matching by introducing an asymmetric circular ridge on the E‐plane of the coupled waveguide. As a result, the length of the SB‐TWT coupler is reduced from more than 3λ to 1λ. At the same time, the beam tunnel area is enlarged to twice that of the SWC beam tunnel. In the working band (90–100 GHz) of the SWC, the simulation results show that the reflection is less than −25 dB, the isolation is greater than −22 dB. And the influence of the dimensions and locations of ridge on the performance of the coupler is studied. Particle‐in‐cell simulation results also show that the new coupler can not only complete the microwave coupling well but also reduce the number of SWC periods.

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Cosimulation and Cold Test Verification of a 220-GHz Sheet Beam Traveling-Wave Tube Amplifier

Shu,

Pan,

et al. 2024

IEEE Trans. Electron Devices

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Demonstration of an Ultracompact, High-Isolation Power Coupler for W-Band Sheet Beam Traveling Wave Tubes

Cited by 3 publications

References 19 publications

Unleashing the Power of Quantum Dots: Emerging Applications from Deep‐Ultraviolet Photodetectors for Brighter Futures

Unleashing the Power of Quantum Dots: Emerging Applications from Deep‐Ultraviolet Photodetectors for Brighter Futures

Design of an ultrashort H‐plane coupler without transition structure for sheet beam traveling‐wave tube amplifier at W‐band

Cosimulation and Cold Test Verification of a 220-GHz Sheet Beam Traveling-Wave Tube Amplifier

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