File:L-over2-rad-pat-per.jpg

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Summary

Description
English: Radiation pattern of a vertical half-wave dipole antenna. In this 3 dimensional perspective graph, the antenna is at the center, and the distance of the graph from the center at any angle is proportional to the energy density of the radio waves radiated at that angle by the antenna. This is called a omnidirectional antenna. The antenna radiates equal radio power in any azimuthal direction, and the radiation is maximum in horizontal directions and decreases monotonically to zero at the zenith or nadir, on the antenna's axis. Omnidirectional antennas are used by terrestrial radio communication systems in which the direction to the transmitter or receiver is unknown or changing, such as broadcasting, two-way radio transceivers, and wireless devices, since they radiate maximum power in all horizontal directions but little power up into the sky or down toward the Earth, where it would be wasted.
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Perspective view of the radiation patterns of a lambda over 2 antenna. Perspective view.

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GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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Captions

Radiation pattern of a dipole antenna

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Date/TimeThumbnailDimensionsUserComment
current17:16, 18 July 2006Thumbnail for version as of 17:16, 18 July 2006196 × 149 (7 KB)wikimediacommons>LP~commonswikiRadiation pattern of a lambda over 2 dipole antenna. Perspective view.

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