Study and Experimental Validation of a 0.34 THz Double Corrugated Waveguide Interaction Structure for Backward Wave Oscillator with Sheet Electron Beam.

Autor: Latif, Jibran, Wang, Zhanliang, Jameel, Atif, Nadeem, Muhammad Khawar, Ali, Bilawal, Shakir, Uzair, Feng, Jinjun, Gong, Yubin
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Zdroj: Journal of Infrared, Millimeter & Terahertz Waves; Apr2024, Vol. 45 Issue 3/4, p370-382, 13p
Abstrakt: Terahertz backward wave oscillators based on double corrugated waveguides are enabling devices for modern satellite communication systems. This research focuses on the design of a 0.34 THz double corrugated waveguide-based interaction structure using a sheet beam. This choice allows the use of shorter pillars along with a narrow gap between pillar rows. Shorter pillars are easier to manufacture and a narrow gap is required for better interaction impedance. Circular beams restrict the use of larger pillars and narrow gap between pillars. The performance of this interaction structure is compared with a folded waveguide. Under the same operating conditions involving a 20 kV beam voltage and a 30 mA beam current, the double corrugated waveguide interaction structure exhibits impressive performance in simulations, featuring an interaction impedance of 0.52 Ω at 0.34 THz, an output power of 3.2 W, and a bandwidth extending to approximately 20 GHz. In contrast, the folded waveguide, as per simulation results, registers values of 0.43 Ω , 2.6 W, and a 12 GHz bandwidth, respectively. The proposed double corrugated waveguide-based interaction structure is fabricated using modern CNC machining. Experimental validation reinforces the effectiveness of this design, with measurements indicating reflection below −20 dB and transmission exceeding −2 dB. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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