Hidetsugu Yagi

When working at Tohoku Imperial University, he wrote several articles that introduced a new antenna designed by his assistant Shintaro Uda to the English-speaking world.

Antennas of this type were widely used for television and radio reception, and are still common in communication and radar systems.

[citation needed] Yagi also tried, unsuccessfully, to introduce a wireless power transmission system.

[citation needed] After 1930, Hidetsugu Yagi was involved, as a adviser, in the operation of the Number Nine Research Laboratory run by Iwakuro Hideo.

[4] The topic of wireless communication, which he pursued during his studies abroad, would become a research theme to which he would dedicate his entire life.

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 Yagi–Uda design is widely used at VHF and UHF frequencies, since at these wavelengths, the lengths of the elements are conveniently small.