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Improving the Power Efficiency of a Microwave Plasma Source by Using the Principle of a Variable-Impedance Waveguide

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Listed:
  • Thanaset Thosdeekoraphat

    (School of Electronic Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

  • Supawat Kotchapradit

    (School of Electronic Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

  • Watcharapong Bunpradit

    (School of Electronic Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

  • Worawut Boonpeang

    (School of Electronic Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

  • Chanchai Thongsopa

    (School of Electronic Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

  • Samran Santalunai

    (School of Electronic Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

Abstract

Microwave plasma sources are used in various applications, but inefficiency can limit their usefulness. Researchers have investigated a new approach with which to improve efficiency by using a waveguide with a special tuner. A standard waveguide was compared to one equipped with a stub tuner, which allows for the fine-tuning of the electrical properties. The experiment used a frequency of 2.45 GHz and tested input powers of 1 kW and 1.5 kW. Experiments showed that waveguides with tuners transferred power more efficiently, with fewer reflected and more transmitted microwaves. While peak temperatures remained similar, the tuned waveguide produced a hotter plasma flame (30–60 °C) at the same distance. Notably, increasing the input power further boosted the flame temperature by 300 °C. These findings suggest that stub tuners can significantly improve the efficiency of microwave plasma sources. This paves the way for more efficient plasma generation technologies and potentially allows for applications requiring even higher power.

Suggested Citation

  • Thanaset Thosdeekoraphat & Supawat Kotchapradit & Watcharapong Bunpradit & Worawut Boonpeang & Chanchai Thongsopa & Samran Santalunai, 2024. "Improving the Power Efficiency of a Microwave Plasma Source by Using the Principle of a Variable-Impedance Waveguide," Energies, MDPI, vol. 17(12), pages 1-21, June.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:12:p:2996-:d:1417047
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    References listed on IDEAS

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    1. Tomasz Rybicki & Zbigniew Stempien & Iwona Karbownik, 2021. "EMI Shielding and Absorption of Electroconductive Textiles with PANI and PPy Conductive Polymers and Numerical Model Approach," Energies, MDPI, vol. 14(22), pages 1-19, November.
    2. Mateusz Wnukowski, 2023. "Methane Pyrolysis with the Use of Plasma: Review of Plasma Reactors and Process Products," Energies, MDPI, vol. 16(18), pages 1-34, September.
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