TY - JOUR
T1 - Study of an Ultra-Wideband Sine-Shape Staggered Waveguide for a Terahertz Band Sheet Beam TWT
AU - Liao, Jiacai
AU - Shu, Guoxiang
AU - Li, Xinqiang
AU - Shi, Binbin
AU - Hong, Shengtao
AU - Huang, Longshen
AU - Ruan, Cunjun
AU - He, Wenlong
N1 - Publisher Copyright:
© 1980-2012 IEEE.
PY - 2025
Y1 - 2025
N2 - A novel slow wave structure (SWS) featuring an innovative sine-shape staggered waveguide (SSW) and dual-mode operation has been developed for ultra-wideband sheet beam travelling wave tubes. In contrast to the double-staggered grating SWS, the SSW SWS is equivalent to reducing the grating height, enabling the broadening of the operational bandwidth while maintaining interaction impedance characteristics. Numerical simulations demonstrate exceptional broadband characteristics with S11 below -15.3 dB and S21 exceeding -8.5 dB across 237-324 GHz (87 GHz), achieving 31.0% fractional bandwidth. Cold-test results are consistent with the simulation results having considered fabrication tolerances, electromagnetic leakage, and surface roughness effects. PIC simulations predict good performance, achieving 65.0 W output power over a 76 GHz bandwidth (236-312 GHz, 27.8% fractional bandwidth), with a peak output power of 253.0 W at 250 GHz.
AB - A novel slow wave structure (SWS) featuring an innovative sine-shape staggered waveguide (SSW) and dual-mode operation has been developed for ultra-wideband sheet beam travelling wave tubes. In contrast to the double-staggered grating SWS, the SSW SWS is equivalent to reducing the grating height, enabling the broadening of the operational bandwidth while maintaining interaction impedance characteristics. Numerical simulations demonstrate exceptional broadband characteristics with S11 below -15.3 dB and S21 exceeding -8.5 dB across 237-324 GHz (87 GHz), achieving 31.0% fractional bandwidth. Cold-test results are consistent with the simulation results having considered fabrication tolerances, electromagnetic leakage, and surface roughness effects. PIC simulations predict good performance, achieving 65.0 W output power over a 76 GHz bandwidth (236-312 GHz, 27.8% fractional bandwidth), with a peak output power of 253.0 W at 250 GHz.
KW - Sine-shape staggered waveguide
KW - slow wave structure
KW - travelling wave tubes
KW - ultra-wideband
UR - https://www.scopus.com/pages/publications/105013206303
U2 - 10.1109/LED.2025.3598920
DO - 10.1109/LED.2025.3598920
M3 - 文章
AN - SCOPUS:105013206303
SN - 0741-3106
VL - 46
SP - 1873
EP - 1876
JO - IEEE Electron Device Letters
JF - IEEE Electron Device Letters
IS - 10
ER -