In an antenna array made of multiple conductive elements, a driven element or active element is electrically connected to the receiver or transmitter while a parasitic element is not.
Yagi antenna for UHF TV reception with 22 parasitic elements; 4 reflectors attached to the vertical bracket at left, and 18 directors attached to the horizontal beam at right. The driven element is attached to the black box next to the reflectors. The antenna is most sensitive to radio waves coming from the right, parallel to the antenna's axis.
Maszt radiowy w Konstantynowie
Dipole antenna
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In radio and telecommunications, a dipole antenna or doublet is one of the two simplest and most widely used types of antenna; the other is the monopole. The dipole is any one of a class of antennas p
Driven and parasitic elements
…or transmitter through a feed line, and a number of other elements which are not driven, called parasitic elements. The driven element is often a dipole. The parasitic elements couple electromagnetically with the driven element and re-radiate the induced currents, modifying the radiation pattern and…
UHF half-wave dipole
Dipole antenna used by the radar altimeter in an airplane
Cage dipole antennas in the Ukrainian UTR-2 radio telescope. The 8 meters (30 feet) long by 1.8 meters (6 feet) diameter galvanized steel wire dipoles have an operating frequency range of 8–33 MHz.
Length reduction factor for a half-wave dipole to achieve electrical resonance (purely resistive feedpoint impedance). Calculated using the induced EMF method, an approximation that breaks down at larger conductor diameters (dashed portion of graph).