Yagi antenna

Helping orphans the way you would do it

A Yagi-Uda Antenna (also known simply as a Yagi antenna) is an end-fire antenna array that consists of a driven dipole (usually a folded dipole connected directly to the transmission line), a parasitic reflector, and one (or more) parasitic directors. As with all end-fire antenna arrays, its direction of maximum gain is along its extended axis.

All the elements usually lie in the same plane. The parasitic elements do not need to be coplanar, but can be distributed on both sides of the plane of symmetry.

The Yagi-Uda antenna was invented in 1926 by Shintaro Uda of Tohoku University, Sendai, Japan, with the collaboration of Hidetsugu Yagi, also of Tohoku University. Yagi published the first English-language article on the antenna in 1928 and it came to be associated with his name. However, Yagi always acknowledged Uda's principal contribution to the design. The proper name for the antenna is, as above, the Yagi-Uda antenna (or array).

Related concepts: Antenna theory