Trapezoidal double ridge waveguide slow wave structure for 340 GHz backward wave oscillator

Shi Huifen; Yue Lingna; Gao Boning; Xu Jin; Cai Jinchi; Yin Hairong; Wang Wenxiang; Xu Yong; Wei Yanyu

doi:10.11884/HPLPB202537.250069

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Shi Huifen, Yue Lingna, Gao Boning, et al. Trapezoidal double ridge waveguide slow wave structure for 340 GHz backward wave oscillator[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250069

Citation:

Shi Huifen, Yue Lingna, Gao Boning, et al. Trapezoidal double ridge waveguide slow wave structure for 340 GHz backward wave oscillator[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.250069

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Trapezoidal double ridge waveguide slow wave structure for 340 GHz backward wave oscillator

doi: 10.11884/HPLPB202537.250069

1.
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2.
Tianfu Jiangxi Laboratory, Chengdu 641419, China

Received Date: 2025-04-11
Accepted Date: 2025-07-12
Rev Recd Date: 2025-06-18

Available Online: 2025-07-30

Abstract

Abstract

A trapezoidal double ridge waveguide slow wave structure has been proposed to further enhance the interaction impedance and output power of backward wave oscillators. Compared to conventional sine double ridge waveguide and flat-roofed sine double ridge waveguide, significant improvements in both the axial interaction impedance at the center of the electron beam channel and the average interaction impedance across the cross-section are observed, while maintaining a similar normalized phase velocity. Simulation results indicate that within the frequency range of 320～360 GHz, the average interaction impedance of the trapezoidal double ridge waveguide is increased by 78.33% to 86.97% compared to the sine double ridge waveguide, and by at least 46.65% compared to the flat-roofed sine double ridge waveguide. Under the same operating conditions and frequency range, the output power of the trapezoidal double ridge waveguide backward wave oscillator in the 340 GHz band is measured to be 5.55～8.03 W, representing an increase of 26.97% to 73.44% compared to the sine double ridge waveguide and an enhancement of 33.65% to 52.47% over the flat-roofed sine double ridge waveguide. At this point, all three types of backward wave oscillators are optimized for tube length, with the trapezoidal double ridge waveguide backward wave oscillator being at least 16.5% shorter than the other two structures.
- terahertz backward wave oscillator,
- trapezoidal double ridge waveguide,
- slow wave structure,
- enhancement of interaction impedance,
- simulation

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References(21)

References

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