Demonstration of a Double Flat-Roofed Sine Waveguide Slow Wave Structure With Low Loss for 220-GHz Traveling-Wave Tube

A double flat-roofed sine waveguide (DFRSWG) slow wave structure (SWS) with low loss for 220-GHz traveling-wave tube (TWT) has been demonstrated in this letter. Through the simulation method, it is inferred that this structure has a large coupling impedance and excellent transmission properties. Bes...

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Bibliographic Details
Published in:IEEE microwave and wireless technology letters (Print) 2023-03, Vol.33 (3), p.1-4
Main Authors: Zhang, Luqi, Ma, Guowu, Jiang, Yi, Lei, Wenqiang, Hu, Peng, Tang, Xianfeng, Chen, Hongbin, Wei, Yanyu
Format: Article
Language:English
Subjects:
Amplifier
beam–wave interaction
Couplings
Electron tubes
Impedance
Loss measurement
millimeter wave
Power generation
Propagation losses
Scattering parameters
slow wave structure (SWS)
traveling-wave tube (TWT)
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Summary:A double flat-roofed sine waveguide (DFRSWG) slow wave structure (SWS) with low loss for 220-GHz traveling-wave tube (TWT) has been demonstrated in this letter. Through the simulation method, it is inferred that this structure has a large coupling impedance and excellent transmission properties. Besides, the experimental results demonstrate that the transmission loss of the circuit is only 0.62-0.75 dB/cm and the return loss is more than 19.3 dB in the frequency band of 210-250 GHz. Eventually, a two-section DFRSWG interaction circuit is designed to achieve stable device performance. Based on the particle-in-cell (PIC) simulation results, it can be predicted that the DFRSWG TWT can generate the maximum output power of 235 W at 220 GHz, which corresponds to a gain of 36.72 dB and an electronic efficiency of 6.06%.
ISSN:2771-957X
2771-9588
DOI:10.1109/LMWC.2022.3215519