Yagi antenna

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 dipole reflector, and one (or more) parasitic dipole directors. As with all end-fire antenna arrays, its direction of maximum radiation is parallel to its extended axis.

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

Related concepts: Antenna theory