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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
UHF half-wave dipole
UHF half-wave dipole
Dipole antenna used by the radar altimeter in an airplane
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
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 EM
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).
Monopole antenna
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A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane. The current fro
A typical mast radiator monopole antenna of an AM radio station in Chapel Hill, North Carolina. The metal mast itself is connected to the transmitter and radiates the radio waves. It is mounted on a ceramic insulator to isolate it from the ground. The other terminal of the transmitter is connected to a radial ground system consisting of cables buried under the field.
A typical mast radiator monopole antenna of an AM radio station in Chapel Hill, North Carolina. The metal mast itself is connected to the transmitter
Amateur radio cage T antenna at Riverhead, New York, used to communicate with Europe at frequency of 1.5 MHz, 1922
Amateur radio cage T antenna at Riverhead, New York, used to communicate with Europe at frequency of 1.5 MHz, 1922
Trideco umbrella antenna of the VLF transmitter at Anthorn military radio station, UK, transmitting at 19.6 kHz
Trideco umbrella antenna of the VLF transmitter at Anthorn military radio station, UK, transmitting at 19.6 kHz
Retractable quarter-wave whip antenna for FM reception on a portable radio, 88 - 108 MHz
Retractable quarter-wave whip antenna for FM reception on a portable radio, 88 - 108 MHz