Definitions for "Yagi antenna"
A type of directional antenna used on some types of radar and radio equipment consisting of an array of elemental, single-wire dipole antennas and reflectors. Named for its inventor Japanese electrical engineer Dr. Hidetsugu Yagi (1886-1976).
Linear end-fire antenna, consisting of three or more half-wave elements, one driven, one reflector, and one or more directors, providing very high directivity and gain, formal name: Yagi-Uda array.
Communications: An unidirectional antenna with at least three elements: a reflector, a driven element and at least one director. Also called a Yagi-Uda Array, after Hidetsugu Yagi and Shintaro Uda, who collaborated in developing this antenna type.