Susumu Takabayashi

Susumu Takabayashi was born in Kure, Hiroshima, Japan, in 1976. He received the B.E., M.E., and Ph.D. degrees in photoelectrochemistry from Osaka University, Osaka, Japan, in 2000, 2002, and 2005, respectively. He was a post-doctoral fellow with Kinki University Fukuoka campus, Iizuka, Fukuoka, Japan, for a half year and Hiroshima University, Hiroshima, Japan, for four years. He was with the Research Institute of Electrical Communication (RIEC), Tohoku University, Sendai, Japan, from 2010 to 2015, where he was promoted to an assistant professor in 2012. In 2015, he joined ADTEC Plasma Technology Co., Ltd., Fukuyama, Hiroshima, which is a manufacturer of a pair of radio-frequency power source and impedance matching box as a discharge plasma resource. He worked as a development engineer in the R&D department and engaged in quality control in the quality department. Since April, 2020, he has been an associate professor at National College of Technology, Ariake College, Omuta, Fukuoka, Japan. He belongs to Energy Course, Department of Creative Engineering, where he is teaching electromagnetism, electronics experiments, electrical circuit design, and quality management. His current research interests include physics, chemistry, and electronics application of carbonaceous materials grown by plasma methods.

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National Institute of Technology, Ariake College


Associate Professor




A Step-by-Step Education Program of Radio-Frequency Impedance Matching in Electrical Engineering
Susumu Takabayashi

A step-by-step education program of radio-frequency impedance matching in the electrical engineering course of National Institute of Technology, Ariake College (Ariake Kosen) is presented. Impedance matching in electrical engineering is a very important concept for radio-frequency electrical circuit design and fabrication. Circuits without considering impedance matching are not power efficient and do not lead effective telecommunication. Moreover, such incomplete impedance matching may cause breakdown or fire in high-power sources by the reactive power reflection. However, impedance matching is difficult to learn theoretically and practically because it requires deep understanding of both electrical circuit and electromagnetism. In our course, a step-by-step education process ranged over three grades in the Kosen system is established so that students learn it without difficulty. The education starts in the fourth grade from theoretical approach with the application of Maxwell's equations of electromagnetism including the skin effect and electromagnetic wave. Practical impedance matching in the audible KHz region with audio circuit fabrication is performed in the next fifth grade. Finally, in the sixth grade (the first grade of the advanced course), theoretical telegraphic equation is educated, following that impedance matching of a waveguide in the MHz and GHz regions is experienced with the S-parameter analysis using a vector network analyzer (VNA). VNAs are one of the most expensive apparatuses in electrical engineering. Fortunately, a low-cost VNA such as NanoVNA is released recently. With a NanoVNA, the whole impedance matching education system for many students is completed. Through this program, students will be expected as radio-frequency electrical engineers.

Education Research and Practice
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