The Yagi-Uda antenna, patented in 1926, remains a global standard for directional radio transmission. Developed through research into short and ultra-short waves, this invention enabled reliable communication across various radio bands. Its simple construction ensured its persistence in radar and television systems long after the device was first introduced to the English-speaking world by Japanese electrical engineer Hidetsugu Yagi.
Early Education and International Research
Born in Osaka in 1886, Hidetsugu Yagi pursued technical training at Osaka Prefectural Kitano High School before graduating from the University of Tokyo in 1909. He eventually earned a Doctor of Engineering degree in 1921. His early career involved significant international exposure; starting in 1913, he worked with Heinrich Barkhausen in Germany on electric arc oscillations, J.A. Fleming in England regarding the vacuum diode, and G. W. Pierce at Harvard in the United States.
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Upon joining the faculty at Tohoku Imperial University in 1919, Yagi focused his research on wireless communication. He correctly identified that short and ultra-short waves would serve as the foundation for future communication technologies. He published several papers on the generation and measurement of these waves, eventually securing patent number 69115 for an antenna design that utilized a method for directional electric waves. While his assistant Shintaro Uda contributed to the design, Yagi was instrumental in disseminating the technical details internationally.
Academic Leadership and Public Service
Yagi held numerous high-level administrative positions throughout his career. He served as the president of the Tokyo Institute of Technology starting in 1942, the president of the Technical Institution in 1944, and the president of Osaka Imperial University in 1946. Beyond academia, he was a member of the House of Councillors, leveraging his expertise in the public sphere. His contributions were formally acknowledged through the Order of Culture in 1956, the Person of Cultural Merit award, and the Grand Cordon of the Order of the Rising Sun, 1st class, which he received posthumously in 1976.
Fast facts
- Born: 1886, Osaka
- Died: 1976, Tokyo
- Education: University of Tokyo, Osaka Prefectural Kitano High School
- Key Invention: Yagi-Uda antenna (patented 1926)
- Academic Roles: President of Tokyo Institute of Technology and Osaka University
- Major Awards: Order of Culture (1956), Order of the Rising Sun (1st class)
- Professional Memberships: Japan Academy
- Fields: Electrical engineering, radio-frequency engineering, physics
Questions readers ask
What is the primary function of the Yagi-Uda antenna?
It allows for directional transmission and reception of radio waves, proving particularly effective for very high frequency and ultra high frequency bands.
Did Yagi have other research interests?
Yes, he conducted unsuccessful research into wireless power transmission systems and was involved in the operation of the Number Nine Research Laboratory.
Achievements
- Affiliated with University of Osaka, Tokyo Institute of Technology and Tohoku University
- Educated at University of Tokyo and Osaka Prefectural Kitano High School
- Worked as physicist, university teacher and businessperson
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