Uda Shintaro

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Uda Shintaro

Uda Shintarō ( Japanese 宇田 新 太郎 ; * July 1, 1896 in Funami (today: Nyūzen ), Shimoniikawa-gun , Toyama Prefecture ; † August 18, 1976 ) was a Japanese electrical engineer and co-inventor of the Yagi-Uda antenna .

Life

He studied at Tōhoku University with Professor Hidetsugu Yagi at the Institute of Electrical Engineering.

With his fellow student Yuji Nishimura, he had investigated the natural wavelength of catchy coils (i.e. with only one turn). Nishimura, who graduated in March 1924, published the results in September 1925 in the Journal of the Institute of Electrical Engineering of Japan (JIEE) under Measurements of natural wavelengths of single-turn coil

Uda also graduated in 1924 and joined a research group led by Yagi. For communication between islands and ships, they researched shortwave radio and directional antennas. To this end, the institute received financial support from the Saito Gratitude Foundation.

One of his first projects was the development of an oscillator circuit with electron tubes that would work at a wavelength of 4.40 m. The experiments with the oscillator as a transmitter led to the discovery of his " Wave Projector ". He originally used a resonant circuit antenna and observed the directional radiation it produced. Then, according to Nishimura's idea, he placed a parasitic coil in front of the active coil in order to achieve a more strongly directed radiation. Ultimately, he replaced the parasitic coils with metal rods and found that the field strength in the preferred direction increases with the number of rods. Then he began with systematic investigations of the directional behavior by changing the length, spacing and geometric arrangement of the parasitic elements.

In February 1926 he and Yagi published the article Projector of the Sharpest Beam of Electric Waves in the Proceedings of the Imperial Academy of Japan.

Between March 1926 and July 1929 Uda published a series of articles in JIEE in Japanese on the wireless Beam of short electric waves . However, this received little attention in Japan. Only a state telephone connection was set up from Sakata to the island of Tobishima , about 40 km away .

In 1927 Uda began working on communication transmitters and receivers and developed a regenerative and super-regenerative receiver for the frequency range from 300 to 1500 MHz.

Yagi prepared an English summary in response to an IRE meeting in the USA in 1928. Although he highlighted Uda's merits in it, it then became known as the Yagi antenna .

From 1937 Uda worked on the development of the magnetron for the X-band .

During World War II, Gentai Sato was astonished that the Allied radar was equipped with Yagi antennas.

After the Second World War, Uda carried out analyzes of the klystron.

When he visited the USA in 1951, he was astonished that his antenna was used as a television antenna on every house roof.

1955-58 he supervised propagation measurements for a 2 GHz telephone system in India.

In 1960 he retired.

Publications

  • Yagi-Uda Antenna ; with Yasuto Mushiake; Sendai, Japan; The Research Institute of Electrical Communication, Tohoku Univ., 1954
  • Short wave projector; historical records of my studies in early days ; 1974

Web links

Individual evidence

  1. ^ [1] Sarkar: History of Wireless
  2. ^ Hidetsugu Yagi, Shintaro Uda: Projector of the Sharpest Beam of Electric Waves . In: Proceedings of the Imperial Academy . Vol. 2, No. 2 , 1926, p. 49-52 , doi : 10.2183 / pjab1912.2.49 ( JST.Journalarchive / pjab1912 / 2.49 ).
Japanese name: As is common in Japan, the family name comes before the first name in this article . Thus, Uda is the family name, Shintarō the first name.
personal data
SURNAME Uda, Shintaro
BRIEF DESCRIPTION Japanese electrical engineer and inventor of the Yagi antenna
DATE OF BIRTH July 1, 1896
PLACE OF BIRTH Funami (today: Nyūzen ), Shimoniikawa-gun , Toyama Prefecture
DATE OF DEATH 18th August 1976