Background
Yagi Hidetsugu was born on January 28, 1886 in Osaka Prefecture, Japan.
(A three-element Yagi-Uda antenna used for amateur radio. ...)
A three-element Yagi-Uda antenna used for amateur radio. The longer reflector element (left), the driven element (center), and the shorter director (right) each have a so-called trap (parallel LC circuit) inserted along their conductors on each side, allowing the antenna to be used at two different frequency bands.
(Six rooftop Yagi-Uda television antennas in Israel. The Y...)
Six rooftop Yagi-Uda television antennas in Israel. The Yagi-Uda design is widely used at VHF and UHF frequencies, since at these wavelengths, the lengths of the elements are conveniently small.
八木 秀次
Yagi Hidetsugu was born on January 28, 1886 in Osaka Prefecture, Japan.
Yagi Hidetsugu graduated from the Department of Electronic Engineering of the Tokyo Imperial University, Faculty of Sciences, in 1909. From 1913 he studied in Germany where he worked with Heinrich Barkhausen on generating CW oscillations by electric arcs; England where he worked with J.A. Fleming who invented the vacuum diode; and the United States where he worked with J.A. Fleming at Harvard who invented the Pierce oscillator which generated a continuous wave. He earned the doctorate from Tokyo Imperial University.
Yagi Hidetsugu returned to Japan in 1930. After 1930, Hidetsugu Yagi was involved, as a contractor, in the operation of the Number Nine Research Laboratory run by Iwakuro Hideo.
In 1942, Yagi Hidetsugu became Director of the Industrial Sciences Faculty of the Tokyo University, in 1944 he became General Director of the Technology Institute, and in 1946 also General Director of the Osaka Imperial University. He was the fourth president of Osaka University from February 1946 to December 1946.
When working at Tohoku University, Yagi Hidetsugu wrote several articles that introduced a new antenna designed by his colleague Shintaro Uda to the English-speaking world. The Yagi antenna, patented in 1926, allows directional communication using electromagnetic waves, and is now installed on millions of houses throughout the world for radio and television reception. He also tried, unsuccessfully, to introduce a wireless power transmission system.
Yagi Hidetsugu was decorated with the Medal of Honor with Blue Ribbon Award in 1951, with the Order of Culture in 1956, and posthumously with the Grand Cordon of the Order of the Rising Sun in 1976.
