File:A6-3EN.jpg

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A6-3EN.jpg (280 × 262 pixels, file size: 4 KB, MIME type: image/jpeg)

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English: Diagram of a quarter-wave monopole antenna and its image (dotted line) reflected by a ground plane. Label in english. When a monopole antenna is mounted above a ground plane such as the Earth, the radio waves emitted downwards by the antenna reflect off the ground plane. The radiation pattern of the antenna is the sum of the direct waves and the reflected waves, which seem to come from an image antenna below the ground. The real antenna and its image form a dipole antenna, so the radiation pattern of a monopole antenna is the top half of a dipole radiation pattern.
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Author LP
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I, the copyright holder of this work, hereby publish it under the following license:
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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Date/TimeThumbnailDimensionsUserComment
current12:31, 17 August 2006Thumbnail for version as of 12:31, 17 August 2006280 × 262 (4 KB)LP~commonswiki (talk | contribs)Quarter-wave antenna and its image reflected by the ground plane. Label in english. 2006

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