Study of a 0.3 THz Double-Staggered Grating Waveguide-Based Band-Edge Oscillator

IF 1.3 4区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

IEEE Transactions on Plasma Science Pub Date : 2024-11-13 DOI:10.1109/TPS.2024.3490541

Guoxiang Shu;Qi Li;Xinlun Xie;Jujian Lin;Guangxin Lin;Jiacai Liao;Huaxing Pan;Wenlong He

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Abstract

The design of a novel band-edge oscillator based on double-staggered grating waveguides (DSGWs) is presented in this article. For a traveling wave tube (TWT), the band-edge oscillation is typically expected to be eliminated since it will affect the stable operation of a TWT. However, in this design, such an oscillation is employed to generate a high-power terahertz signal within a small tunable bandwidth (~2.0 GHz) by changing the beam voltage. To suppress the higher-order modes competition, a novel concentrated attenuator with the mode filtering property is proposed. To verify this design, a DSGW circuit made of 88 periods was manufactured and measured. Measured results showed that the transmission coefficient

$S_{21}$

was higher than −8.0 dB; meanwhile, the reflection coefficient

$S_{11}$

was lower than −10.0 dB over the bandwidth of 2.0 GHz (298.6–300.6 GHz). The DSGW circuits with two different kinds of dielectric attenuators were also processed and tested. The simulated and measured S-parameters and dispersion curves were in agreement, demonstrating the feasibility of our design. PIC simulation results predicted an output power exceeding 101.2 W within the frequency range of 298.6–300.6 GHz (2.0 GHz).

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基于0.3 THz双交错光栅波导的带边振荡器研究

本文设计了一种基于双交错光栅波导的新型带边振荡器。对于行波管（TWT）来说，由于带边振荡会影响行波管的稳定运行，因此通常希望消除带边振荡。然而，在本设计中，通过改变波束电压，利用这种振荡在一个小的可调带宽（~2.0 GHz）内产生高功率太赫兹信号。为了抑制高阶模竞争，提出了一种具有模滤波特性的集中式衰减器。为了验证这一设计，制作了一个由88个周期组成的DSGW电路并进行了测量。测量结果表明，传输系数$S_{21}$大于−8.0 dB；在2.0 GHz （298.6 ~ 300.6 GHz）带宽范围内，反射系数$S_{11}$小于−10.0 dB。对采用两种介质衰减器的DSGW电路进行了加工和测试。模拟和实测的s参数和色散曲线基本一致，证明了设计的可行性。PIC仿真结果预测在298.6 ~ 300.6 GHz （2.0 GHz）频率范围内输出功率超过101.2 W。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Plasma Science 物理-物理：流体与等离子体

CiteScore

3.00

自引率

20.00%

发文量

538

审稿时长

3.8 months

期刊介绍： The scope covers all aspects of the theory and application of plasma science. It includes the following areas: magnetohydrodynamics; thermionics and plasma diodes; basic plasma phenomena; gaseous electronics; microwave/plasma interaction; electron, ion, and plasma sources; space plasmas; intense electron and ion beams; laser-plasma interactions; plasma diagnostics; plasma chemistry and processing; solid-state plasmas; plasma heating; plasma for controlled fusion research; high energy density plasmas; industrial/commercial applications of plasma physics; plasma waves and instabilities; and high power microwave and submillimeter wave generation.