Antenna (radio)
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In radio-frequency engineering, an antenna or aerial is a structure used to convert alternating electric currents into radio waves for transmission, and to convert radio waves back into electric curre
A television antenna used for reception of television signals in VHF
Antennas of the Atacama Large Millimeter/submillimeter Array
An automobile's whip antenna, a common example of an omnidirectional antenna
Half-wave dipole antenna
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
Antenna (radio)
…pioneering experiments to prove the existence of electromagnetic waves predicted by the 1867 electromagnetic theory of James Clerk Maxwell. Hertz placed dipole antennas at the focal point of parabolic reflectors for both transmitting and receiving. Starting in 1895, Guglielmo Marconi began development of antennas…
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).