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Yagi antenna

Yagi antenna systems use the parasitic elements in combination with active elements to control the direction and width of the beam. Yagi antennas are used for various high-frequency applications such as the reception of television signals, point-to-point communications, and certain types of military communications. Yagi antennas generally consist of three types of elements: reflector, radiator, and directors. These three components are typically arranged such that the director element is in the front, the radiator is behind the director, and the reflector is behind the radiator. All of these elements are typically positioned along an antenna axis with the director elements extending in what is referred to herein as the transmission direction from the dipole. The transmission direction is that direction to which electromagnetic energy is to be transmitted, or from which signal energy is to be received. The radiator is an active element that receives the power concentrated by the parasitic elements. The reflector is a parasitic element with an inductive quality. The directors are also parasitic elements but with a capacitive quality. The director and reflector obtain their power by coupling with the radiator. The Yagi antenna optimizes gain by using specific director lengths and spacing between the directors and the driven element.

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